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  • Offer Profile
  • KELLER AG für Druckmesstechnik headquartered in Winterthur (Switzerland), is Europe’s leading manufacturer of isolated pressure transducers and transmitters. The company, which has a global workforce of around 400 employees, was founded in 1974 by Hannes W. Keller, a graduate in physics and the inventor of the integrated silicon measuring cell. The entire value creation, from production of the individual parts and calibration of the sensor through to the final inspection of the finished products, takes place at the headquarters in Winterthur. All KELLER AG products are therefore “Made in Switzerland”.
Product Portfolio
  • Pressure Transducers

      • Piezoresistive OEM Pressure Transducers

          • Series 3 L - 10 L

          • OEM Pressure Transducer Series 3 L to 10 L

            Laser Welded Media Isolation Diaphragm

            Series 3L...10L, a new range of transducers that benefit from smaller capsule dimensions and crevice free diaphragms. Keller has developed a new technique for laser welding very thin stainless steel media isolation diaphragms. The smaller crevice free transducers still retain all the traditional performance, stability, and quality, for which Keller is renowned.

            Each transducer is supplied with a calibration sheet indicating sensitivity, linearity, zero offset, temperature errors and the compensation resistors to substantially reduce zero offset and zero temperature errors.

            With the laser welded technology, transducers having diameters as low as 9,5 mm can be realised. Diameter is to some extent dependent upon the pressure range measured, low pressures require larger diameters, higher pressures can be achieved with smaller diameters. This is due to the expansion of the oil under temperature that creates an internal pressure due to the resistance of the diaphragm. The smaller the diameter, the higher the internal pressure and the more difficult is the zero compensation.
          • Series 6

          • Piezoresistive OEM Pressure Transducers Series 6

            Sealed Gauge, Vented Gauge

            The Series 6 capsules are of all welded stainless steel construction, with integral media isolation diaphragm. No 'O'ring seals are used. The Series 6 uses a silicon TAB sensor mounted in the oil filled stainless steel capsule, providing a highly stable measuring cell with negligible hysteresis, high output signal and a life of millions of pressure cycles.

            TAB (Tape Automated Bonding) is a flexible printed circuit system for interconnection between the silicon sensor and the capsule output pins, offering improved reliability and significantly lower production costs.
          • Series 7

          • Piezoresistive OEM Pressure Transducers Series 7

            Absolute- and Sealed Gauge Pressure

            The Series 7 pressure sensors are for medium pressure ranges, and are the smallest, lightest isolated OEM-sensors available. They have a diameter of only 15 mm without compromising quality and performance.

            A high-sensitivity piezoresistive silicon chip is used for pressure sensing. The chip is protected against ambient influences by a stainless steel housing sealed with a concentrically corrugated diaphragm. The housing is filled with silicone oil for the transfer of the pressure from the diaphragm to the sensing component.
          • Series 7 Li

          • High-Temperature OEM Pressure Transducer Series 7 LI

            200 °C / 200…1000 bar

            7 LI series OEM pressure transducers, ø 15 mm, are designed for high-pressure and hightemperature applications.

            Robust and corrosion-resistant
            A high-sensitivity piezoresistive silicon chip is built in as the pressure-sensing element. Pressure is transmitted via an oil filling. The upstream separating diaphragm completely isolates the pressure chip from the medium to be measured.
            The fully heat-sealed housing and the laser-welded separating diaphragm are made of Inconel 718, which aside from its strength also guarantees a high resistance to aggressive media.

            High sensitivity
            Thanks to the piezoresistive technology, the typical full signal output for all available measuring ranges is 150 mV with a constant current supply of 1 mA.

            Flexible use
            The absolute pressure transducers are available in four nominal measuring ranges from 200 to 1000 bar, with a maximum permissible operating temperature of 200 °C. The transducer may optionally be provided with an integrated PT100 or PT1000 temperature probe, making independent temperature detection possible.
          • Series 7S / 9S

          • OEM Pressure Transducers Series 7 S / 9 S / 9 FL

            Absolute- and Gauge Pressure

            The Series 7S / 9S is the latest development in media isolated piezoresistive silicon chip pressure transducers. The new low mass one-piece housing is smaller with a brazed stainless steel diaphragm for lower production cost, giving excellent long-term stability combined with easy installation.

            The Series 7 S / 9 S transducers are constructed from 316L stainless steel, using a high temperature hydrogen brazing technique; the brazed 316L diaphragms are highly resistant to corrosion. The diaphragm of the Series 9 FL is laser welded with the housing. Electrical connection is made via a five pin header. Leadout wires, or a PCB, can be soldered directly to the header pins. Series 7SE / 9SE versions are supplied with PCB fitted.

            Typical applications are, heating pumps, autoclaves and dialysers. Other applications include measurement of altitude, avionics, meteorology, servo controls, robotics, hydraulics, hygienic and pharmaceutical engineering, drift mining, injectors, and many more.
          • Series 8

          • Piezoresistive OEM Pressure Transducers Series 8

            Absolute- and Sealed Gauge Pressure

            The Series 8 pressure sensors are extremely durable, even when exposed to fast pressure peaks. They have been developed especially for the measurement of high pressures. The Series 8 sensor for ranges 400…1000 bar uses a thicker glass feed through and a wire-bonded measuring cell.

            A high-sensitivity piezoresistive silicon chip is used for pressure sensing. The chip is protected against ambient influences by a stainless steel housing sealed with a concentrically corrugated diaphragm. The housing is filled with silicone oil for the transfer of the pressure from the diaphragm to the sensing component.

            Typical applications: Industrial processes, aviation electronics, servo controls, oil industry, robotics…
          • Series 9

          • Piezoresistive OEM Pressure Transducers Series 9

            Sealed Gauge, Absolute, Vented Gauge, Differential

            The Series 9 pressure sensor is the most economic version for pressure ranges from 100 mbar to 200 bar. The standard version is supplied with connecting pins (leadouts are fitted only on request) and the serial number is not engraved.

            A high-sensitivity piezoresistive silicon chip is used for pressure sensing. The chip is protected against ambient influences by a stainless steel housing sealed with a concentrically corrugated diaphragm. The housing is filled with silicone oil for the transfer of the pressure from the diaphragm to the sensing component.

            Typical Applications: Measurement of altitude, aviation electronics, meteorology, servo controls, robotics, hydraulics, sanitary and pharmaceutical engineering, underground mining, injection engineering...
          • Series 10

          • Piezoresistive OEM Pressure Transducer Series 10

            Sealed Gauge, Absolute, Vented Gauge, Differential

            The Series 10 pressure transducers cover all pressure ranges from 100 mbar to 1000 bar. They have been produced for over 30 years and are the premium product of the KELLER OEM-line. They are delivered with engraved serial number and electrical leadouts. Several millions of these pressure transducers are in use world-wide in a variety of different applications. Main fields of application are: Level technology, pneumatics, hydraulics, avionics.

            A high-sensitivity piezoresistive silicon chip is used for pressure sensing. The chip is protected against ambient influences by a stainless steel housing sealed with a concentrically corrugated diaphragm. The housing is filled with silicone oil so as to ensure the transfer of the pressure from the diaphragm to the sensing component.
        • High tech miniature pressure sensors

            • Series 2 Mi

            • Series 2 Mi

              Miniature pressure sensor

              Developed for measuring hydrodynamic and aerodynamic pressures. A silicone drum protects the measurement cell from the influence of vibrations and fast acceleration.

              Robust housing (ø 4,5 x 1,9 mm).

              Typical applications: turbine and wing profile measurements.
            • Series M5

            • Ultra-Fast Miniature Pressure Transducer Series M5

              Bandwidth 50 kHz / Resistant up to 200 °C

              The piezoresistive pressure transducers Series M5 are ideal, thanks to the M5 fine thread, for taking measurements at close proximity in places where access is a problem and in very thin pipes – exactly the kinds of conditions associated with engine test benches. The front-flush design prevents gas bubbles interfering with fluid measurements and supports measurements up to 200 °C without a cooling adapter. The extreme dynamic range of 0…50 kHz makes it possible to record very fast pulsations just as reliably as those associated with static pressure values. A vibration-resistant Teflon FEP cable (IP67) ensures the 80 mV output signal is routed securely out of the hot environment and then onwards for processing.

              Performance characteristics
              • Sensor head capable of exposure to 200 °C
              • Broad compensated temperature range, with a choice of either -20…125 °C or -40…180 °C
              • Excellent dynamic response, up to 50 kHz (pulsation measurements)
              • Insensitive to structure-borne vibration
              • Extremely compact design, pressure connection: M5 x 0,5 fine thread
              • Teflon FEP cable with IP67 ferrule, suitable for use on test benches
              • Pressure ranges of 3 bar, 10 bar and 30 bar (absolute)
            • Catheter

            • Catheter

              Medical pressure sensor

              Application in urology, cardiology and gastro-enterology.
              Sizes from 4 to 8 French (1,32 to 2,64 mm in diameter). Modular construction allows arrangements of up to 6 sensors and/or lumen openings for injection of fluids to defined distances. Signal outputs suit most common monitor systems.
            • Sensor Probes

            • Tip sensor

              Miniature pressure probe

              Designed for measuring flow rate and ram pressure in pipework.

              The probe can be advanced a number of metres into tight canals thanks to dimensions ranging from ø 1,32 mm to ø 2,64 mm and a highly flexible cable.

              Suitable for liquid and gaseous media.
          • Piezoresistive Standard Pressure Transducers

              • Series 11

              • Piezoresistive Pressure Transducer Series 11

                Absolute- and Gauge Pressure

                The KELLER Series 10 sensor is mounted with the compensation resistors in a stainless steel housing. The sensor floats on an O-ring seal and is therefore free of any housing stresses. It is particularly suited in connection with µP-based signal processing. Transducers can be ordered with the coefficients of a mathematical model ready for integration with a µP-based system. Error Bands of 0,1%…0,01 %FS are achievable, depending on the temperature ranges.

                Whilst the Series 11 fulfils all the classical functions expected of a mV-transducer, it is often used in development of larger OEM projects to test the performance of the KELLER OEM sensors. As a special order, any OEM sensor from Series 3 to 10 can be ordered in such a housing, with or without integrated compensation resistors. The customer can then verify that the chosen OEM sensor is suitable for the application.
              • Series 13

              • Piezoresistive Pressure Transducer Series 13

                For Media Temperatures up to 350 °C

                Watercooled pressure transducers are used for accurate static and dynamic measurements in fluids up to 350 °C. The sensor, an integrated silicon cell with four diffused strain gauge resistors, is located in the watercooled section of the oil-filled body. The oil transmits the pressure from the flush steel diaphragm to the sensor, isolating it from the temperature of the media. This allows very accurate pressure measurements over a wide temperature range without influencing the pressure or flow conditions.

                Originally developed for blow down tests on water-cooled reactors, these transducers find many applications in high temperature chemical reactions and engine tests.
              • Series 15

              • Piezoresistive Pressure Transducer Series 15

                Flush Diaphragm

                Piezoresistive pressure transducers with flush diaphragm. Flush diaphragms are used in applications where minimal dead volumes or very high frequencies are required or if the diaphragm could become incrusted by the media.
            • Low Cost Transducers

                • Sensors Series 1 TAB



                • Low Cost

                  The TAB-pressure sensor (TAB: Tape Automated Bonding) is a silicon cell that is directly bonded to a flexible Kapton film.

                  The contacts of the TAB can directly be soldered onto a print or glass feed through.
                • Series 2, Series 4

                • Sensors Series 2 and Series 4

                  Low Cost

                  The Series 2 and 4 pressure sensors are suited for direct-mounting on printed circuit boards or if small dimensions and low prices are required.

                  Series 2: The medium is acting directly on the silicon chip with contacts for the bridge. Application in dry air and athmosphere only.

                  Series 4: The medium acts on the rear side of the silicon chip. The pressure medium may be wet. Applications in gas, water and non-aggressive fluids with benign reference atmosphere. Ideal for underpressure measurements.
                • Series 6 M / S

                • Piezoresistive Transducers Series 6 MC / S(C)

                  Low Cost

                  These piezoresistive pressure transmitter-heads are produced on the new KELLER automatic brazing lines, making possible the mass production of high quality pressure transmitters at low cost. This new technology allows the crevice-free construction of the pressure port without using seals or O-rings. In the brass sensor line (Series 6 MC), a steel insert and a nickel diaphragm are brazed into a brass housing. In the steel version (Series 6 S, Series 6 SC), all parts are of stainless steel (AISI 316 L). The header with the silicon pressure sensor and the glass feed-through pins are welded to the steel insert underneath the oil filling.

                  These transducers are the ideal basis for pressure transmitters, pressure switches or digital pressure instruments.
              • Pressure Transmitters

                  • Pressure Transmitters for Industrial Applications

                      • 4 LC…9 LC

                      • Piezoresistive OEM Pressure Transmitters Series 4 LC…9 LC

                        -40…150 °C, with Embedded Signal Conditioning

                        The Series 4 LC…9 LC family of miniature OEM pressure transmitters combines a piezo resistive pressure sensor with -40…150 °C-capable signal conditioning in one compact, easy-to-integrate package.

                        The "LC" line of miniature pressure transmitters leverages Keller's extensive background in high-stability piezoresistive pressure sensors and innovative digital signal processing. Now, both pressure sensor and signal processor are integrated into a miniature, hermetically-sealed housing no larger than was once required for the sensor only!

                        The name given to this new technology is Chip-In-Oil (CIO). CIO means not only that the entire pressure transmitter is embedded within a hermetically-sealed, oil-filled housing, but that this transmitter can then be seamlessly integrated into the OEM product, achieving cost savings and system performance not possible with other, conventional technologies.
                      • 4 LD…9 LD

                      • Piezoresistive OEM Pressure Transmitters Series 4 LD…9 LD

                        With I2C interface and Embedded Signal Conditioning

                        With the D-line, Keller introduces a unique combination consisting of an exceedingly robust
                        industrial pressure transducer and the popular I2C microcontroller interface. Pressure transmitters with this interface are commonly available only in consumer market housings made of plastic or ceramic, where merely the parameters for compensation are stored in an integrated memory. The D-line OEM transmitters however have an unprecedented embedded digital signal processing (DSP) core for the compensation and normalization of the output values.

                        Performance features:
                        • Ultra low power consumption, optimised for battery powered applications
                        • Hermetically protected sensor electronics – extremely resistant to environmental influences
                        • Ultra-compact, robust housing made from stainless steel (optional Hastelloy C-276)
                        • No external electronics for compensation or signal processing
                        • Extremely accurate, outstanding long-term stability, no hysteresis
                        • Pressure ranges of 1 bar to 200 bar
                        • Easy to integrate into microcontroller based systems
                        • Internal two-chip solution with pressure sensor and signal processing separation provides a high degree of flexibility
                      • Series M5 HB

                      • Ultra-Fast and Precise Pressure Transmitters Series M5 HB

                        Bandwidth 50 kHz / Resistant up to 200 °C / Accuracy 0,1 %FS

                        The Series M5 pressure transmitters, with their 0…50 kHz dynamic range and M5 pressure connection, are optimized both for dynamic (i.e. fast pressure pulsations at close proximity) as well as static pressure measurements. The sensor design enables excellent media compatibility and supports measurements at temperatures of up to 200 °C without cooling adapters.

                        Sensor technology
                        The Series M5 sensor incorporates a stable silicon sensor which is backside-soldered directly to a supporting element designed for excellent fluid dynamics. This construction eliminates the disadvantages of sealants, adhesives, separating membranes or capillary tubes in high temperature environments. The practically-flush connection to the measurement media is critical to the excellent dynamic range of 0…50 kHz. The micromechanical design delivers absolute measuring ranges of 3, 10 and 30 bar, overpressure protection of up to 5 times measuring range and effective isolation of mounting forces.

                        Performance characteristics
                        • Sensor head capable of exposure to 200 °C
                        • Broad compensated temperature range, with a choice of either -20…125 °C or -40…180 °C
                        • Excellent dynamic response, up to 50 kHz (pulsation measurements)
                        • Insensitive to shock and vibration
                        • Extremely compact design, pressure connection: M5 x 0,5 fine thread
                        • Teflon FEP cable with IP67 ferrule, suitable for use on test benches
                        • Pressure ranges of 3 bar, 10 bar and 30 bar (absolute)
                      • Series 21 C

                      • Piezoresistive Pressure Transmitter Series 21 C

                        For Industrial Applications, Ratiometric Output

                        The C-series transmitters are noted for their ability to deliver high accuracy over a wide temperature range. This is achieved by means of mathematical modelling of the sensor characteristics and digital compensation. In order to do this, each transmitter is gauged over pressure and temperature, programmed and checked after calibration in the same test set-up.

                        The modular design of the Series 21 C and the extensive vertical range of in-house manufacture provide a high degree of flexibility. The company can quickly adapt to customer requests, even with large production batches. The extensive standard range of connectors and pressure connections means that a CIO measuring cell (Chip-in-Oil) can be quickly welded in from stock if small numbers are involved, and then calibrated to the required temperature range.
                      • Series 21 PY (Pisello)

                      • Series 21 PY "Pisello"

                        Piezoresistive Miniature Pressure Transmitters

                        Ultramodern welding techniques and advances in the miniaturization of electronic circuits now make it possible to manufacture a pre-insulated, piezoresistive micro-transmitter with properties that were no more than a dream 10 years ago.

                        The circuit is based on the PromComp principle which KELLER offered in a separate version as a laboratory device 20 years ago when it attained accuracy of 0,1 %FS over a temperature range of 100 K. In those days the electronic circuitry was the size of a cigar box, but now it can be accommodated on a print that is a mere 12 mm in diameter.

                        Although this digital component is only slightly more expensive to produce than an analog circuit, it allows a piezoresistive sensor to be calibrated to an accuracy of 0,5 %FS over a potential temperature range of 100 K.
                      • Series 21 Y

                      • Piezoresistive Pressure Transmitters Series 21 Y

                        For Industrial Applications

                        The Y-line transmitters have an extremely small temperature error. This is achieved using an additional circuit containing a temperature sensor that subdivides the temperature range into fields that are 1,5 Kelvin (K) wide.

                        The extent of the vertical range of manufacture, the modular design and the programmable electronics make it possible to manufacture large, customer-specific batches.

                        The 21 Y product line is outstanding due to its extreme ruggedness towards electromagnetic fields. The limits of the CE standard are undercut by a factor of up to 10 with conducted and radiated fields. These transmitters are also extremely immune to external voltages between the housing and the electrical connection, which is particularly important when frequency converters are being used. The high insulation voltage of 300 V make this product ideal for use in the harshest of environments.
                      • Series 22 DT

                      • Piezoresistive Transmitters Series 22 DT

                        For Automotive- and Industrial Applications

                        Series 22 DT was developed and homologated specially for use in so-called "bivalent" vehicles fitted with engines for combined natural gas/gasoline operation. The unconventional design with a small mass swept by the flow results in a fast response with temperature changes, the temperature being measured by an NTC or PT sensor located directly behind the stainless steel separating diaphragm. The same diaphragm transmits pressure via a capillary to a stress-free mounted silicon measuring cell.

                        The signal processing for pressure and temperature is carried out by an electronic module connected to the sensors by flexible conductors. Mounted to the back of the electronic module, which is directly connected to the 6-pole plug connector are the EMC protection components. A special feature is the immunity from interference from electromagnetic fields up to 200 V/m.
                      • Series 22 M/S

                      • Piezoresistive Transmitters Series 22 M/S

                        Automotive and Industrial Applications

                        Series 22 offers a reliable cost effective solution for customers requiring medium to high quantities, of mass produced transmitters. Utilising the KELLER automatic brazing lines, this new technology allows crevice-free construction of the pressure port with no internal seals or O-rings, making possible high volumes at low cost.

                        In the brass 22 M, a steel insert and a nickel diaphragm are brazed into a brass housing. In the steel 22 S, all parts are stainless steel (AISI 316 L). The glass feed-through header and silicon pressure sensor are welded to the steel insert underneath the oil filling.
                      • Series 23 / 25

                      • Piezoresistive Transmitters Series 23 / 25

                        Absolute-, Gauge- and Differential Pressure

                        These piezoresistive transmitters have been designed for precision applications in industrial environments for pressures ranging from 0,2 to 1000 bar, liquids or gas.

                        A Complete Range:
                        Absolute, barometric, gauge (over- and underpressure) and differential for wet/wet applications. 13 nominal pressure ranges. Current or voltage output.

                        Flexibility:
                        A modular concept uses the selection of off-the-shelf capsules, allowing a customised production. Numerous options and variants are available, fully adapted to the customer's requirements: Mechanical and electrical interface, ports, signal outputs, materials in media contact, oil filling, oxygen-compatibility, special features, flameproof versions…
                      • Series 23 (S)Y / 25 Y

                      • Piezoresistive Pressure Transmitters Series 23 (S)Y / 25 Y

                        Error Band 0,5 %FS (0…50 °C)

                        The Y-line transmitters have an extremely small temperature error. This is achieved using an additional circuit containing a temperature sensor that subdivides the temperature range into fields that are 1,5 Kelvin (K) wide. The TK zero and TK compensation values are calculated for each field and programmed into the additional circuit. During operation, these values are fed into the analogue signal path depending on the temperature. Each temperature is the "calibration temperature" for this transmitter.

                        The Series 23 (S)Y/25 Y product line is outstanding due to its extreme ruggedness towards electromagnetic fields. The limits of the CE standard are undercut by a factor of up to 10 with conducted and radiated fields.
                      • Series 33 X / 35 X

                      • Highly Precise Pressure Transmitters Series 33 X / 35 X

                        Mathematically Compensated / Programmable

                        Digital Output of Transmitter:
                        This high precision of 0,01 %FS is available as an option (the standard Series 33 X has an accuracy of 0,05 %FS). These Series are based on the stable, floating piezoresisitive transducer and the newly developed XEMICS micro-processor with integrated 16 bit A/D converter. Temperature dependencies and non-linearities of the sensor are mathematically compensated.

                        Transmitter with Analog Output:
                        Integrated in the XEMICS processor is a D/A converter of 16 bit for analog signal outputs of 4…20 mA or 0…10 V. The output rate is 400 Hz. The accuracy is diminished by this converting process by 0,05 %FS. The digital output is available on all transmitters with analog output.
                      • Series PRD-33 X

                      • Differential Pressure Transmitters

                        With high overload resistance and line pressure output

                        The Series PRD-33 X was developed for applications that require a high accuracy differential pressure measurement together with high overload resistance in differential pressure ranges as low as 350 mbar.

                        The Series PRD-33 X is the result of ongoing development of the KELLER PD-33 X differential pressure transmitter. Thanks to a second integrated pressure sensor, the line, or common mode, pressure can now be measured along with the differential pressure, resulting in several notable features not found in traditional differential pressure transmitters.

                        For example, compensation for line pressure effect is now accomplished during factory calibration. Moreover, both differential and line (absolute) pressure may be read by the user. In addition, the PRD-33 X features high differential overload resistance; e.g., ± 35 bar with a differential measuring range of only 350 mbar (100:1)

                        The internal differential pressure sensor element is isolated from the High (+) side media by a compliant stainless steel diaphragm, while the Low (-) side media impinges directly on the back side of the silicon measuring cell. Also isolated from the High (+) side media is the line (absolute) pressure sensor. The floating sensor assembly guarantees maximum decoupling from external mechanical forces.
                      • Series PD-39 X

                      • Differential Pressure Transmitters Series PD-39 X

                        Based on two Absolute Sensors

                        The Series PD-39 X does not measure the differential pressure directly – instead, it uses two absolute pressure sensors to take the measurement indirectly. As well as reducing costs, this differential pressure transmitter is also more robust in relation to unbalanced (one-sided) overloading. The differential pressure range should be at least 5% of the standard pressure range. Each pressure side has two pressure connections, so the

                        Pressure measurements can be displayed and recorded on PC or Laptop with help of the software ControlCenterSeries30 (CCS30) and a seriel interface cable. Export of recordings to usual file formats possible. Up to 128 devices can be connected together into a KELLER Bus-system.

                        Intrinsically Safe Version Series PD-39 X Ei available (data sheet in preparation).
                      • Series 41 X

                      • Capacitive Transmitter Series 41 X / 41 X Ei

                        From 1 mbar Full Range / Resolution 1 µbar

                        The Series 41 X combines the ceramic measurement cell for low pressure ranges with the µP-electronics of the digital Series 30 transmitter. The pressure values from the signals of the pressure and temperature sensors are determined by polynomial compensation. The values can be displayed and stored on a PC via an RS485 interface and programming can also be carried out.

                        This pressure transmitter is also available as intrinsically safe version (Series 41 X Ei). It is used in explosion exposed areas, where the categories 1 and 2 are required.
                    • Pressure Transmitters for Hazardous Applications

                        • 23 Ed/25 Ed, 33 X Ed/35 X Ed

                        • Piezoresistive Transmitters with Pressure Proof Housing
                          Series 23 Ed / 25 Ed, 33 X Ed / 35 X Ed


                          For Hazardous Applications

                          These piezoresistive pressure transmitters with pressure proof housing are approved for use in explosion risk areas of group II. They provide stable and accurate measurements of absolute and gauge pressures of liquid and gaseous media in the pressure range between 0,1 and 300 bar.

                          Analog transmitters, Series 23 Ed and 25 Ed:
                          This series is based on the stable piezoresistive transducer with analog electronics. The zero point and sensitivity, and the temperature coefficients for the zero point and sensitivity, are compensated by resistors and/or potentiometers.

                          Digital transmitters Series 33 X Ed and 35 X Ed:
                          This series features microcontroller-based electronic evaluation to ensure maximum accuracy. Each transmitter is gauged across the entire pressure and temperature range. This provides the basis for calculating a mathematical model that corrects all reproducible errors. The pressure value can be read via the interface and at the same time it is also available in analog form as a 4…20 mA or 0…10 V version.
                        • 23 (S) Y Ei / 25 Y Ei / 26 Y Ei

                        • Intrinsically Safe Piezoresistive Pressure Transmitters
                          Series 23 (S)Y Ei / 25 Y Ei / 26 Y Ei


                          For gas and dust atmospheres

                          These piezoresistive pressure transmitters are approved for use in highly explosion risk areas of group II (gas and dust).

                          The Y-line transmitters have an extremely small temperature error. This is achieved using an additional circuit containing a temperature sensor that subdivides the temperature range into fields that are 1,5 Kelvin (K) wide. The TK zero and TK compensation values are calculated for each field and programmed into the additional circuit. During operation, these values are fed into the analogue signal path depending on the temperature. Each temperature is the „calibration temperature” for this transmitter. The accuracy thereof is mainly determined by linearity. 120 fields are available, representing a possible temperature range of 180 K. The wider the temperature range, the greater the amount of testing that is needed to minimise the inaccuracy of the mathematical model.
                        • 33 X Ei / 35 X Ei / 36 XW Ei

                        • Highly Precise Pressure Transmitters
                          Series 30 X Ei (LV)


                          For Hazardous Applications

                          These piezoresistive pressure transmitters are approved for use in high explosive gas and dust atmospheres of groups I (mining industry) and II (industrial applications) where there is a high risk of explosion. Optionally available are Low Voltage Versions (LV) with 3,5…8,5 V.

                          Signal processing:
                          This series features microcontroller-based electronic evaluation to ensure maximum accuracy. Each transmitter is gauged across the entire pressure and temperature range. This measurement data is used to calculate a mathematical model that enables correction of all reproducible errors. In this way, KELLER can guarantee high accuracy as an error band within the overall compensated pressure and temperature range. Two compensated temperature ranges are available for industrial transmitters, according to choice: -10…80 °C and 10…40 °C. The level probes are gauged in the 0…50 °C temperature range only. The calculated pressure value can be read via the interface, and is simultaneously processed as an analog signal.

                          Interface:
                          The interface is designed as a robust RS485 half-duplex for 9'600 and 115'200 baud. It can be used to implement bus systems with 128 subscribers and line lengths of up to 1400 m. There is an external leadthrough for the interface on all products except the version with the DIN 43650 plug.

                          Options:
                          • Low Voltage Version labelled with “LV” in Type Designation
                          • Mining Version labelled with “M” in Type Designation
                          • Dust approval
                        • Series PD-39 X Ei

                        • Differential Pressure Transmitters Series PD-39 X

                          Based on two Absolute Sensors

                          The Series PD-39 X does not measure the differential pressure directly – instead, it uses two absolute pressure sensors to take the measurement indirectly. As well as reducing costs, this differential pressure transmitter is also more robust in relation to unbalanced (one-sided) overloading. The differential pressure range should be at least 5% of the standard pressure range. Each pressure side has two pressure connections, so the

                          Pressure measurements can be displayed and recorded on PC or Laptop with help of the software ControlCenterSeries30 (CCS30) and a seriel interface cable. Export of recordings to usual file formats possible. Up to 128 devices can be connected together into a KELLER Bus-system.

                          Intrinsically Safe Version Series PD-39 X Ei available (data sheet in preparation).
                        • Series 41 X Ei

                        • Capacitive Transmitter Series 41 X / 41 X Ei

                          From 1 mbar Full Range / Resolution 1 µbar

                          The Series 41 X combines the ceramic measurement cell for low pressure ranges with the µP-electronics of the digital Series 30 transmitter. The pressure values from the signals of the pressure and temperature sensors are determined by polynomial compensation. The values can be displayed and stored on a PC via an RS485 interface and programming can also be carried out.

                          This pressure transmitter is also available as intrinsically safe version (Series 41 X Ei). It is used in explosion exposed areas, where the categories 1 and 2 are required.
                        • Series 46 X Ei

                        • Capacitive Transmitters Series 46 X / 46 X Ei

                          For Water Level Measurements

                          The Series 46 X combines the ceramic measuring cell for low pressure ranges with the µP-electronics of the digital Series 30 pressure transmitters. The signal values of the pressure- and temperature sensors are determined by a polynomial compensation. The values can be shown and stored on a PC and can be reprogrammed. A reference tube integrated in the cable connects the referential chamber of the sensor with the ambient pressure.

                          This pressure transmitter is also available as intrinsically safe version (Series 46 X Ei). It is used in explosion exposed areas, where the categories 1 and 2 are required.
                      • Pressure Transponder with passive RFID Interface

                            • Series 21 D RFID

                            • Pressure transponders / Data loggers Serie 21 D(C) RFID

                              With passive RFID Transponder Interface

                              This series is a unique combination of an extremely sturdy, tried-and-tested industrial pressure transmitter and RFID (radio frequency identification) wireless technology.

                              The D line piezoresistive transmitters used to measure pressure are based on KELLER’s own chip-in-oil technology. The laser-welded, hermetically sealed stainless steel housing, which is filled with oil for pressure transmission, contains the pressure transducer and the ultra-
                              energy-efficient compensation electronics with I2C interface.

                              Series 21 D RFID: Passive RFID pressure transponders
                              The plastic cap houses the interface to the pressure transmitter and all RFID components including the antenna. The scanner provides the power required to log instantaneous values.

                              Series 21 DC RFID: RFID data loggers
                              These pressure transponders come with extra data recording functionality. The integrated battery allows data to be measured and stored. Stored measurements are transmitted wirelessly and exclusively via the RFID interface.

                              Performance features:
                              • Extremely resistant to environmental impact
                              • Ultra-compact stainless steel housing, also available in Hastelloy C-276
                              • High accuracy, outstanding long-term stability, hysteresis-free
                              • Temperature displayed alongside accurate pressure reading
                              • Pressure ranges from 3 to 1’000 bar
                              • Freely programmable measuring point numbers (8 alphanumeric characters)
                        • Pressure Transmitters for Biotechnology / Food Industries

                            • Series 25 F

                            • Piezoresistive Transmitters Series 25 F

                              For Food Industries

                              These pressure transmitters have been designed for applications in the food- and beverage industries.

                              The stainless steel flange DIN 11851 realises a dead volume free media connection. Thus, incrusting by the media is reduced to a minimum. The cleaning and sterilisation of the media-wetted parts is made easy.
                            • Series 35 X HT(T)

                            • Piezoresistive Transmitters Series 35 X HT(T)

                              For Applications in Bio-Reactors or Autoclaves

                              Piezoresistive pressure transmitter for applications in bio-reactors or autoclaves. The transmitter is compensated up to 150 °C and may be operated continuously or sterilised at this level, including the special circuit electronics.

                              The transmitters are supplied in absolute or gauge versions, with current or voltage output.

                              The sensing component is a micro-machined silicon pressure chip of high sensitivity. An independent temperature sensor is integrated on the surface of the silicon chip.

                              Pressure measurements can be displayed and recorded on PC or Laptop with help of the software ControlCenterSeries30 (CCS30) and a seriel interface cable. Export of recordings to usual file formats possible. Up to 128 devices can be connected together into a KELLER Bus-system.
                            • Series 35 X HTC

                            • High Temperature Pressure Transmitters Series 35 X HTC

                              For Biotechnology / Food Industries

                              This piezoresistive high temperature transmitter is suited for media temperatures up to 300°C. The pressure, acting onto the flush diaphragm, is transferred over an oil-filled capillary onto the silicon measuring cell. The capillary has the function of a cooling spiral, allowing media temperatures of up to 300°C. The temperature of the electronics, which can be read out with the PROG30 software, may not exceed 120 °C. For highly aggressive media, KELLER offers pressure ports in different materials.

                              Programming:
                              Pressure measurements can be displayed and recorded on PC or Laptop with help of the software ControlCenterSeries30 (CCS30) and a seriel interface cable. Export of recordings to usual file formats possible. Up to 128 devices can be connected together into a KELLER Bus-system.
                          • Piezoresistive Force Transmitter

                                • FA-23

                                • Piezoresistive Force Transmitters Series FA-23

                                  Force Ranges 2…15 kN

                                  A double sealing system with piezoresistive pressure measurement cell enables a simple, exact force measurement cell to be realized. The pressure measurement cell used may be calibrated directly in force, taking into consideration the diameter of the piston which transfers the force via a high-viscosity fluid to the pressure measurement cell.

                                  The force transmitters are employed at locations where a force cannot be calculated directly from the fluid pressure and area (e.g. if additionally the tank filling is under pressure).

                                  One of many applications is e.g. the determination of the amount contained in a tank. The accuracy Series FA-23 is typically 15 litre with a 1500 litre tank.
                            • Intelligent Transmitter with Digital Indication

                                  • LEO 3

                                  • Intelligent Transmitter with Digital Indication

                                    Bus-capable / Programmable 4…20 mA Output

                                    LEO 3 is a micro-processor based transmitter with digital double-display for pressure (top display) and for the output signal (bottom display). The display is powered from the 4...20 mA current loop. Functions:

                                    MAX/MIN: Activating the right key brings the Max.- and Min.-values to the lower display. After 5 seconds, the analog signal is indicated again.
                                    RESET: The Max.- and Min.-values are set to actual.
                                    ZERO SET: The zero is set to the applied pressure.
                                    ZERO RES: Restores the instrument back to factory settings.
                                    UNITS: The pressure values can be displayed in different units.
                              • Level Probes

                                  • Piezoresistive Pressure Transmitters for Level Measurements

                                      • Series 26 W

                                      • Piezoresistive Pressure Transmitters Series 26 W

                                        For Level- and High Precision Pressure Measurements

                                        The Series 26 W transmitter utilises the Series 10 piezoresistive capsule, which is housed inside a submersible 316 L stainless steel body as standard.

                                        For corrosive applications hastelloy diaphragms and other materials are available as options. Series 26 W vented gauge versions have cable with integral vent tube. These transmitters are fitted with durable PE cable.
                                      • Series 26 Y

                                      • Piezoresistive Low-Cost Level Transmitter Series 26 Y

                                        Absolute and Relative Pressure

                                        The pressure transmitters Series 26 Y are used in water level measurements that are price-sensitive but still require considerable accuracy.

                                        With the Series 26 Y, the monocrystalline silicon measuring cell is reliably protected from the measuring medium by a stainless steel diaphragm. The steel diaphragm itself is protected from mechanical influence by a plastic cap, and has outstanding.
                                      • Series 26 Y Ei

                                      • Intrinsically Safe Piezoresistive Pressure Transmitters
                                        Series 23 (S)Y Ei / 25 Y Ei / 26 Y Ei

                                        For gas and dust atmospheres

                                        These piezoresistive pressure transmitters are approved for use in highly explosion risk areas of group II (gas and dust).

                                        The Y-line transmitters have an extremely small temperature error. This is achieved using an additional circuit containing a temperature sensor that subdivides the temperature range into fields that are 1,5 Kelvin (K) wide. The TK zero and TK compensation values are calculated for each field and programmed into the additional circuit. During operation, these values are fed into the analogue signal path depending on the temperature. Each temperature is the „calibration temperature” for this transmitter. The accuracy thereof is mainly determined by linearity. 120 fields are available, representing a possible temperature range of 180 K. The wider the temperature range, the greater the amount of testing that is needed to minimise the inaccuracy of the mathematical model.
                                      • Series 36 XKY

                                      • Level Transmitters with Kynar®-Diaphragm Series 36 XKY

                                        For sewage applications / Non-fouling

                                        Specifically designed for extended service in sewage lift station environments, the 36 XKY by KELLER features a relatively wide sensing diaphragm yet small overall size. The 36 XKY incorporates a monolithic diaphragm formed from Kynar®, which combines the non-stick quality of Teflon with superior toughness and abrasion resistance that simplify installation and eliminate the need for bulky and expensive protective cages.

                                        Product Benefits:
                                        - Non-fouling diaphragm design
                                        - Housing resist chemical attack (AISI 316L)
                                        - Digital interface RS485
                                        - Rangeable analog output
                                        - Mathematically compensated
                                        - Increased reliability in lightning-prone regions
                                      • Serie 36 X S

                                      • Programmable Level Pressure Transmitter Series 36 X S (Stretto-Line)

                                        ø 16 mm / Digitally compensated / Rangeable

                                        This pressure transmitter is designed for level measurement in narrow downhole applications where highest accuracy is required.

                                        Product Benefits: Only 16 mm diameter, mathematically compensated, programmable, assisting inventory reduction, filtering function 2 ms...30 sec, improved surge protection

                                        Pressure measurements can be displayed and recorded on PC or Laptop with help of the software ControlCenterSeries30 (CCS30) and a seriel interface cable. Export of recordings to usual file formats possible. Up to 128 devices can be connected together into a KELLER Bus-system.
                                      • Series 36 X W

                                      • Highly Precise Level Transmitters Series 36 X W

                                        Digitally Compensated / Rangeable / Digital and Analog Output

                                        This Series is based on the stable, piezoresisitive transducer and a micro-processor electronics with integrated 16 bit A/D converter. Temperature dependencies and non-linearities of the sensor are mathematically compensated. With the READ30 software and the KELLER cable K-107, the calculated pressure can be displayed on a Palmtop, Laptop or PC. The READ30 software also allows the recording of pressure signals and the graphic display on the PC. Up to 128 transmitters can be hooked together to a Bus-system.

                                        Programming:
                                        Pressure measurements can be displayed and recorded on PC or Laptop with help of the software ControlCenterSeries30 (CCS30) and a seriel interface cable. Export of recordings to usual file formats possible. Up to 128 devices can be connected together into a KELLER Bus-system.
                                      • Series 36 XW Ei

                                      • Highly Precise Pressure Transmitters
                                        Series 30 X Ei (LV)


                                        For Hazardous Applications

                                        These piezoresistive pressure transmitters are approved for use in high explosive gas and dust atmospheres of groups I (mining industry) and II (industrial applications) where there is a high risk of explosion. Optionally available are Low Voltage Versions (LV) with 3,5…8,5 V.

                                        Signal processing:
                                        This series features microcontroller-based electronic evaluation to ensure maximum accuracy. Each transmitter is gauged across the entire pressure and temperature range. This measurement data is used to calculate a mathematical model that enables correction of all reproducible errors. In this way, KELLER can guarantee high accuracy as an error band within the overall compensated pressure and temperature range. Two compensated temperature ranges are available for industrial transmitters, according to choice: -10…80 °C and 10…40 °C. The level probes are gauged in the 0…50 °C temperature range only. The calculated pressure value can be read via the interface, and is simultaneously processed as an analog signal.

                                        Interface:
                                        The interface is designed as a robust RS485 half-duplex for 9'600 and 115'200 baud. It can be used to implement bus systems with 128 subscribers and line lengths of up to 1400 m. There is an external leadthrough for the interface on all products except the version with the DIN 43650 plug.

                                        Options:
                                        • Low Voltage Version labelled with “LV” in Type Designation
                                        • Mining Version labelled with “M” in Type Designation
                                        • Dust approval
                                      • Serie 36 Xi W (CTD)

                                      • High-precision pressure level transmitter Series 36 Xi W (CTD)

                                        Multi-Parameter Probe with Digital Interfaces

                                        The 36 Xi W series is built on the latest-generation microcontroller platform, which KELLER has developed to meet extremely high precision requirements and increase compatibility with a wide variety of interfaces. Along with pressure (level) information, digital interfaces also transmit other water parameters such as temperature and conductivity.

                                        The 36 Xi W series is based on the proven KELLER 36 X W series using the high-quality 10 L-series pressure transducer. All series X pressure level transmitters feature an RS485 interface, which provide pressure and temperature standard, while versions requiring higher accuraty, temperature or conductivity sensor are available options. Multi-parameter probes fitted with pressure, temperature and conductivity sensors (CTD – conductivity, temperature, depth), are approximately 90 mm longer.

                                        Characteristics
                                        • Pressure sensor: resolution 5 ppm
                                        • Mathematical compensation of nonlinearities and temperature dependencies
                                        • Sturdy stainless steel housing (titanium or Hastelloy also available)
                                        • Extended lightning protection fitted to the SDI-12 interface as standard
                                        • Level measuring ranges from 0…3 m to 0…300 m. Higher ranges are possible using a Sub-Conn® connector
                                        • Ultra-high long-term stability
                                    • Capacitive Pressure Transmitters for Level Measurements

                                          • Series 46 X

                                          • Capacitive Transmitters Series 46 X / 46 X Ei

                                            For Water Level Measurements

                                            The Series 46 X combines the ceramic measuring cell for low pressure ranges with the µP-electronics of the digital Series 30 pressure transmitters. The signal values of the pressure- and temperature sensors are determined by a polynomial compensation. The values can be shown and stored on a PC and can be reprogrammed. A reference tube integrated in the cable connects the referential chamber of the sensor with the ambient pressure.

                                            This pressure transmitter is also available as intrinsically safe version (Series 46 X Ei). It is used in explosion exposed areas, where the categories 1 and 2 are required.
                                      • Data Loggers / GSM

                                          • Autonomous Data Collectors

                                              • DCX-16

                                              • Autonomous Data Collector DCX-16 (VG, SG)

                                                Smallest diameter – ø 16 mm

                                                The DCX-16 is an autonomous, battery-powered data collector in a stainless steel housing with a very small diameter of only 16 mm. In applications where a small probe diameter is an advantage, the logger can record the water level (pressure) and the temperature over long periods.

                                                DCX-16
                                                The sensor, electronics and battery are accommodated in one housing. To extract data, the data collector must be removed from the measuring point, and the watertight screw cap that allows access to the read-out plug /interface must be unscrewed. The DCX-16 operates with an absolute pressure sensor. In shallow water, when the influence of air pressure fluctuations has to be taken into account, a second logger (barometric logger, obtainable separately) positioned on the surface of the water must be used to record the air pressure progression. The computer software then calculates the differential pressure or the water level by subtracting the two measured data.

                                                DCX-16 SG/VG
                                                Instead of a watertight screwed closure, these versions have a cable output. The interface plug is fixed on the sounding tube above the surface of the water with the help of a screw-on fixing disk. This means that there is no need to remove the DCX-16 SG/VG from the sounding tube in order to read the data.
                                                In the VG version (reference pressure measurement), the reference pressure-compensating capillary is routed in the same cable into the read-out plug housing; this also contains the reference aperture (protected by a Gore-Tex® diaphragm) which produces the pressure equalization.
                                              • DCX-18 ECO

                                              • Autonomous Data Collector DCX-18 ECO

                                                ø 18 mm / Data Logging at Favorable Price

                                                The DCX-18 ECO is an autonomous, rechargeable battery powered instrument. It features a stainless steel 18 mm in diameter housing designed to record pressure (water depth) and temperature over long periods at a very economical price. Its small size, rechargeable battery, fully welded housing and the relative sensor option are just a few of the many advantages provided by the DCX-18 ECO.

                                                The electronics employ the latest microprocessor technology which give high accuracy and resolution for the pressure and temperature signals. The measured values are mathematically compensated for all linearity and temperature errors of the pressure sensor.
                                                The use of a non-volatile memory for data storage ensures high data security.

                                                DCX-18 ECO:
                                                The sensor, electronics and the rechargeable battery are housed in a fully welded stainless steel tube for submersible deployment. For data read-out, the DCX-18 ECO must be recovered from the measurement point. The end cap, sealed by two O-Rings, must then be removed to access the serial interface.

                                                DCX-18 ECO with cable:
                                                An optional cable is available for the DCX-18 ECO, enabling data retrieval or configuration and charging the battery without removing the data logger. For relative measuring devices, the cable incorporates a capillary tube which enables venting the relative sensor.
                                              • DCX-22 (SG/VG)

                                              • Autonomous Data Collector DCX-22 (VG, SG)

                                                100% Waterproof

                                                The DCX-22 is an autonomous, battery powered instrument made of stainless steel designed to record water depth (pressure) and temperature over long periods. Two versions are offered:

                                                DCX-22
                                                The sensor, electronics and battery are housed in a sealed stainless steel tube, for submersible deployment. For data read-out the DCX-22 must be recovered from the measurement point. The O-ring sealed end cap is then removed to access the data port.
                                                The DCX-22 works with an absolute pressure sensor. In shallow water depths where the influence of barometric pressure changes should be considered, it is recommended that a second data collector DCX-22 (Baro) is placed at the surface, to record the barometric pressure. The PC then calculates the differential pressure resp. the water depth by subtracting the two measured values.

                                                DCX-22 SG/VG
                                                The sensor is connected by waterproof cable to a surface mounted housing with the data read-out port. This arrangement allows for easier data recovery from fixed installations. The DCX-22 SG/VG does not have to be removed from the dip pipe for data read out. The DCX-22 SG/VG is supplied with a 2" diameter fixing plate to enable mounting at the top of the dip pipe. The sensor can be sealed gauge SG, or vented gauge VG, the cable carries the vent tube for VG version sensors, vent port in the housing is protected by a breathable Gore-Tex® membrane.
                                              • DCX-22 AA

                                              • Data Collector for Water Levels DCX-22 AA

                                                100% waterproof, air pressure compensated

                                                The data collector DCX-22 AA measures and records ground water levels using KELLER's two sensor AA-technology (absolute-absolute). The submersible depth sensor measures the water level. Barometric pressure variations are measured and compensated with the built-in waterproof air pressure sensor which is mounted in the electronics housing at the top of the borehole. There are no ventilation tubes; this means the DCX-22AA data logger is very rugged and suitable for reliable applications in humid and wet environments. Even short periods of immersion and flooding will not cause a problem.

                                                The electronics employ the latest microprocessor technology, which give high accuracy and resolution for the pressure and temperature signals from both the depth sensor and the barometric sensor. The measured values are mathematically compensated for all linearity and temperature errors of the pressure sensors. The use of a non-volatile memory ensures high data security.
                                                The modular design of the DCX-22 AA offers the user the two options for collecting the data.

                                                Standard design requires the user to visit the location, connect via data-cable and download data. The optional GSM-1 unit allows the transmission of data, and instructions (re-programming) to the data-collector from / to a remote location. The data can be sent to any mobile phone as a short message (SMS).
                                              • DCX-25 PVDF

                                              • Autonomous Data Collector DCX-25 PVDF

                                                For aggressive media

                                                The DCX-25 PVDF is an autonomous, battery powered instrument designed to record water depth (pressure) and temperature over long periods. The housing is made of polyvinylidene fluoride and the sensing diaphragm is available in either Hastelloy C-276 or titanium 6AL-4V. This combination of wetted materials ensures compatibility with even the most aggressive media.

                                                This data collector (Ø 25 mm) integrates a pressure sensor, electronics and battery in one housing. The electronics employ the latest microprocessor technology, which give high accuracy and resolution for the pressure and temperature signals. The built-in pressure sensor is mathematically compensated for all linearity and temperature errors. The use of a non-volatile memory ensures high data security.
                                              • DCX-38 VG

                                              • Autonomous Capacitive Data Collector DCX-38 VG

                                                For high resolution water level measurements

                                                The DCX-38 VG is an autonomous instrument for recording water level with a high resolution and full scale ranges as low as 0,5 mWC / 50 mbar. It features a rugged, gold-plated ceramic diaphragm for outstanding long-term stability and stainless steel housing with user serviceable battery for long service life.

                                                The data collector can individually be adjusted to the user's needs and offers the following
                                                advantages:
                                                • Recording of the pressure and temperature
                                                • Simple and well structured configuration- and read-out software (Logger 4.x) for PC or PDA
                                                • Combination of event-controlled recording and interval recording prevents unnecessary data being recorded (i.e. only measuring the pressure changes)
                                                • Installation data (and comments) of the measuring station can be stored in the device

                                                Configuration / Data Retrieval:
                                                For data readout, the serial interface is accessed via the data port located on one end of the cable, enabling on site data retrieval. Using either the K-104A or K-103A converter cable, the DCX-38 VG connects easily to a laptop or PC via USB or serial port. Used in conjunction with Logger 4.X software, the DCX-38 VG is configured and data retrieved either in the lab or the field.
                                            • Data Logger with Measurement of Conductivity

                                                  • DCX-22 AA CTD

                                                  • Data Logger with Measurement of Conductivity DCX-22 AA CTD, DCX-22 (SG/VG) CTD

                                                    Maintenance-free / Autonomous / Ø 22 mm

                                                    The CTD versions of the DCX-22 range are autonomous battery-operated data collectors made of stainless steel. Requiring little maintenance, they record the water level (pressure), tempe­rature and conductivity over long periods. CTD stands for Conductivity, Temperature and Depth.

                                                    This data sheet specifies the additional conductivity measurement function which distinguishes the CTD version from the standard DCX-22 product line. The pressure and temperature specifications are set out in detail in the data sheets for the DCX-22 AA and DCX-22 (SG/VG).

                                                    Conductivity is increasingly being monitored in conjunction with depth measurements, in which changes in water quality and depth are required to be detected simultaneously. Thus it is possible to detect contamination caused by salt water infiltration, waterborne particles or general pollutants when measuring groundwater levels.

                                                    KELLER's Logger 5.1 programming and readout software is used to select a conductivity range (0…0.2 mS/cm, 0…2 mS/cm, 0…20 mS/cm or 0…200 mS/cm) and set the temperature coefficient for the medium. This process produces compensated conductivity measured values standardised at 25 °C.

                                                    DCX-22 AA CTD
                                                    The DCX-22 AA CTD data collector records groundwater levels using the AA (absolute-absolute) measurement method, whereby fluctuations in atmospheric pressure are measured and compensated for by the watertight atmospheric pressure sensor with its stainless steel diaphragm. The advantage of this measurement method is that no humidity-sensitive capillary tube is required. As well, it is not required that the DCX-22 AA CTD be removed from the immersion tube in order to extract the data.

                                                    DCX-22 CTD
                                                    In the DCX-22 CTD, the sensor, electronics and battery are contained within the same housing. The data collector needs to be withdrawn from the immersion tube in order to extract the data. The DCX-22 CTD uses an absolute pressure sensor. In shallow water, where the impact of atmospheric pressure fluctuations also needs to be taken into account, a second DCX, acting as a barometer, is placed at the surface to record changes in atmospheric pressure. The pressure difference or, as appropriate, the water level is then calculated in the PC by subtracting both measured values.

                                                    DCX-22 SG/VG CTD
                                                    The DCX-22 SG/VG CTD versions have a cable outlet, negating the need to withdraw the instrument from the immersion tube in order to read out the data. A locking disc is used to secure the interface connector at the surface. In the VG version (reference pressure measurement), the reference equalisation capillary tube in the cable is inserted into the upper housing (read-out connector), where the reference opening protected by a Gore-Tex® diaphragm is located.
                                              • Remote Data Transmission Unit and Data Logger GSM-2

                                                    • GSM-2

                                                    • Remote Data Transmission Unit and Data Logger GSM-2

                                                      Battery powered, suitable for 2" tubes

                                                      The days are gone when you had to walk every day from measuring point to measuring point in every kind of weather to record the latest water level or read out the installed data logger, because GSM-2 now sends measuring data by e-mail or SMS directly to your office or wherever you are.

                                                      Easy to install, GSM-2 integrates a GSM unit that sends the logged data by E-Mail (Internet connection over GPRS) or SMS. This data transfer works both ways, from and to the GSM-2 module, allowing remote data read-out and configuration.

                                                      GSM-2 main applications are level measurements in groundwater, wells, tanks, drilling holes, water supply and wastewater.

                                                      GSM-2 offers the following features and advantages:
                                                      • Battery powered (low power consumption, battery lasts for years)
                                                      • Smaller than 2" diameter (housing easily fits into standard size tubes)
                                                      • Housing integrates battery and antenna
                                                      • Different interfaces for sensors
                                                      • Built-in atmospheric pressure sensor

                                                      Versions:
                                                      • GSM-2 Standard: For the installation into level tubes for ground water measurements
                                                      • GSM-2 Box: For the easy installation of several level probes
                                                      • GSM-2 Ei: For pressure measurements in potentially explosive gas and dust atmospheres
                                                • Manometers

                                                    • Digital Manometers

                                                        • ECO 1 (Ei)

                                                        • ** The ECO 1 Ei version is yet available through end of 2015 **

                                                          Digital Manometer ECO 1 (Ei)

                                                          Accuracy: 0,5 %FS

                                                          ECO 1 is a compact and economic digital pressure measuring instrument based on a mask programmed OKI-micro-processor. It is of medium accuracy, but of high resolution and repeatability.

                                                          The pressure is measured twice per second and displayed. The top display indicates the actual pressure, the bottom display shows the MAX.- or MIN- pressure since the last RESET.

                                                          ECO 1 has two operating keys. The left key is to turn the instrument on and to execute its functions (the functions appear successively on the display as long as the key is pressed and are executed when releasing the key). The right key is also used to switch between the MAX.- and MIN.-value.

                                                          Also available as intrinsically safe version (ECO 1 Ei).
                                                        • ECO 2

                                                        • Digital Manometer ECO 2

                                                          Max.- and Min.-Function / Accuracy: 0,5 %FS

                                                          ECO 2 is a compact and economical digital pressure measuring instrument providing medium accuracy at high resolution and repeatability. The piezoresistive pressure transducer as the heart of the instrument has gone through extensive pressure- and temperature tests.

                                                          The pressure is measured twice per second and displayed. The top display indicates the actual pressure, the bottom display shows the Max.- or Min.- pressure since the last RESET.

                                                          ECO 2 has two operating keys. The left key turns on the instrument and is used to select the functions and the pressure units. The right key executes the selected function or unit. The right key is also used to switch between the Max.- and Min.-value.

                                                          ECO 2 has 7/16” UNF male thread and is delivered complete with an O-ring seal swivel fitting which allows ECO 2 to be rotated 360°. Only minimal torque is needed to seal up to 300 bar. Process pressure connection is G 1/4” male.

                                                          Optional accessories:
                                                          • Protective rubber covering
                                                          • Carrying bag
                                                        • LEX 1 (Ei)

                                                        • LEX 1: Highly Precise Digital Manometer

                                                          Precision : 0,01 %FS*

                                                          LEX 1 is a micro-processor controlled, accurate and versatile digital pressure measuring instrument with integrated Max.-/Min.-function for calibration and testing purposes.

                                                          The pressure is measured twice per second and displayed. The top display indicates the actual pressure, the bottom display shows the Max.- or Min.-pressure since the last RESET.

                                                          LEX 1 has two operating keys. The left key is to turn the instrument on, to select the functions and the pressure units. The right key executes the selected function resp. unit or serves to display the Max.- and Min.-value.

                                                          Also available as intrinsically safe version (LEX 1 Ei).
                                                        • LEO 1 (Ei)

                                                        • Digital Manometer LEO 1

                                                          With Peak Recording

                                                          LEO 1 is a micro-processor controlled, accurate and versatile digital pressure measuring instrument with integrated fast peak-, max.- and min.-function.

                                                          The instrument is used in two modes:

                                                          Mano-Mode:
                                                          The pressure is measured twice per second and displayed. The top display indicates the actual pressure, the bottom display shows the MAX.- or MIN- pressure since the last RESET.

                                                          Peak-Mode:
                                                          The pressure is measured 5'000 times per second and is brought to the display twice per second. The top display shows the actual pressure, the bottom display the peak- (MAX.) or trough-pressure (MIN.).

                                                          Also available as intrinsically safe version (LEO 1 Ei).
                                                        • LEO 2 (Ei)

                                                        • Digital Manometer LEO 2 / LEO 2 Ei

                                                          Max.- and Min.-Function / Accuracy: 0,1 %FS

                                                          LEO 2 is a compact, micro-processor (µP) controlled, highly accurate and versatile pressure measuring instrument with digital indication. The piezoresistive pressure transducer as the heart of the instrument has gone through extensive pressure- and temperature tests. Its characteristics are stored in the instruments internal EEPROM. The µP of the LEO 2 reads the characteristic values and calculates therefrom the pressure to an accuracy of < 0,1 %FS at room temperature.

                                                          The pressure is measured twice per second and displayed. The top display indicates the actual pressure, the bottom display shows the Max.- or Min.- pressure since the last RESET.

                                                          Also available as intrinsically safe version (LEO 2 Ei).
                                                        • LEO 3

                                                        • Intelligent Transmitter with Digital Indication

                                                          Bus-capable / Programmable 4…20 mA Output

                                                          LEO 3 is a micro-processor based transmitter with digital double-display for pressure (top display) and for the output signal (bottom display). The display is powered from the 4...20 mA current loop. Functions:

                                                          MAX/MIN: Activating the right key brings the Max.- and Min.-values to the lower display. After 5 seconds, the analog signal is indicated again.
                                                          RESET: The Max.- and Min.-values are set to actual.
                                                          ZERO SET: The zero is set to the applied pressure.
                                                          ZERO RES: Restores the instrument back to factory settings.
                                                          UNITS: The pressure values can be displayed in different units.
                                                        • LEO 5

                                                        • High-Resolution Manometer LEO 5 with Peak and Recording Function

                                                          Stainless Steel Housing

                                                          The LEO 5 combines the notable features of Keller’s successful LEO-Record and LEX 1 digital pressure gauges, featuring an IP66-rated stainless steel enclosure. This robust housing combines contemporary microcontroller-based electronics and capacitive-touch controls, operated through the environmentally-sealed safety glass front panel. The large backlit LCD display ensures readability in any lighting conditions.

                                                          Two selectable measurement modes, standard and peak, are included to ensure maximum versatility. In standard mode, high-resolution pressure measurements are taken twice per second. When operating in peak mode, sampling frequency increases to 5 kHz with 16 bit resolution.

                                                          The LEO 5 interfaces with a PC via USB connectivity, allowing access to active measurements and recorded data including pressure, peak pressure, temperature, and measurement interval. PC connection also allows device configuration, firmware updates, and recharging of the integral accumulator power supply.

                                                          The unique modular design of the LEO 5 makes possible adaptation to customer-specific measuring requirements.
                                                        • LEO 5 CA

                                                        • Digital Manometer LEO 5 CA for Tank Content Display

                                                          For ventilated or pressurised tanks

                                                          LEO 5 CA offers a user-friendly way to re­present the pressure measurement at the bottom of a tank as the quantity of remaining liquid. At the push of a button, the micro­-controller performs the calculations using the information of the tank shape and dimen­sions and displays the remaining tank content quantity on the clearly legible 5-digit LED display in the desired unit (litres, gallons etc.).

                                                          The unit is configured using a PC and the easy-to-use software so that the filling level, which determines the pressure, can be converted into an appropriate filling quantity. First the tank ­shape is selected, then the tank dimensions and the specific gravity of the liquid are entered. It contains the most current tank shapes. The program covers the most common tank shapes, but also enables any shape by entering the parameters into a specified table.

                                                          An accuracy of the system of up to 2 mbar (corresponding to a 2 cm water column) is achieved using a computerised calibration and compensation procedure for the pressure sensors.

                                                          LEO 5 CA makes it possible to connect various pressure probe transmitter versions (with thread, front-flush with flange, or submersible sensors).
                                                      • Digital Manometers with Record Function

                                                            • LEO Record (Ei)

                                                            • Digital Manometer LEO Record (Ei)

                                                              With Record Function

                                                              LEO Record is an autonomous battery powered instrument with digital display designed to record pressure and temperature over long periods. Both the piezoresistive LEO Record as well as the capacitive LEO Record (ideal for low pressure ranges) offer the following advantages:
                                                              • High measuring accuracy, resolution and robustness
                                                              • High data security due to the use of a non-volatile memory
                                                              • Display of the actual pressure and the record status
                                                              • Recording of the pressure and temperature
                                                              • Simple and well structured configuration- and read-out software (Logger 4.x) for PC or PDA
                                                              • Combination of event-controlled recording and interval recording prevents unnecessary data being recorded (i.e. only measuring the pressure changes...)
                                                              • Installation data (and comments) of the measuring station can be stored in the instrument
                                                              • Pressure connection with G1/4" thread (other threads on demand)
                                                              • Intrinsically safe versions available.
                                                        • Digital Manometers "daVinci" Line

                                                            • dV-1

                                                            • Digital Pressure Gauge dV-1

                                                              In oval housing or as OEM module

                                                              Cutting-edge micro-controller technology has now made it possible to produce an extremely small and compact pressure gauge with a digital display and very low power consumption.

                                                              The dV-1 pressure gauge is available in bar and PSI units, displayed with a resolution of 0,5 %FS and a measuring interval of 500 ms.

                                                              There are two versions: One has an ON/OFF button to activate the instrument, and the other version without a button automatically activates the display when pressure is applied.

                                                              The devices are available in the typical daVinci line oval housing or as an OEM module that can be integrated into the customer's system.

                                                              Highly competitive pricing and striking simplicity (with no more than one button) make the dV-1 pressure gauge the ideal basis for OEM devices that can be adapted at little expense to meet customers' requirements (design, software, pressure sensor connection, pressure range, battery contacts and display) depending on the volumes required.
                                                            • dV-2

                                                            • Digital Manometer dV-2

                                                              For High Volume Applications

                                                              The dV-2 Series incorporates many of KELLER's latest developments in electronics to produce a simple low cost digital pressure gauge that is packed full of features normally found only on expensive instruments. The dV-2 can be set up to perform various measuring functions via two front panel operating buttons. Gauges are available in three accuracy classes:

                                                              • 0,5 %FS (Standard, Yellow) / • 0,2 %FS (Silver) / • 0,1 %FS (Gold)

                                                              The internal microprocessor has great flexibility. It can be programmed during manufacture to perform numerous functions, and this enables KELLER to offer customised products for specific applications where larger quantities are involved.
                                                            • dV-2 Cool

                                                            • Digital Manometer dV-2 Cool

                                                              For Refrigerant Examination

                                                              The dV-2 Cool was designed for monitoring tasks at refrigerant filling stations. Vapour pressure/temperature graphs for 5 refrigerant liquids are saved in the unit and can be selected by pressing a button.
                                                              The LCD switches from temperature to pressure at the touch of a button, with the display offering a choice of bar / °C or PSI / °F.
                                                              The high resolution display means that dV-2 Cool can also be used for measuring leaks in vacuums.

                                                              Refrigerant: The following refrigerant are stored in the instruments: R22, R12, R507, R404a, R134a. Optional: other refrigerants.
                                                          • Digital Indicators

                                                              • Indicators for Transducers and Transmitters

                                                                  • EV-94 EB

                                                                  • Digital Indicator EV-94 EB for Transmitters

                                                                    Precision at favourable price

                                                                    The new digital indicator EV-94 EB is even more precise, faster, more reliable and equipped with additional inputs.

                                                                    It is universally applicable for measuring value display, controlling, monotoring and counting.

                                                                    The vast self-monitoring and self-diagnosis system ensures high operation security. The high precision, the favourable price and easy use results in the EV-94 EB being a safe and economic investment.
                                                                  • EV-97

                                                                  • Digital Indicator EV-97

                                                                    For Transmitters with DIN 43650 Plug

                                                                    The EV-97 is a universal, µP-powered digital indicator for 4...20 mA standard signals. It is powered from the 4...20 mA Current Loop.

                                                                    • Digital "on-site" pressure display
                                                                    • Scaling for pressure display with 3 keys

                                                                    LED-Version on request.
                                                                    EV-97 delivered without pictured pressure transmitter.
                                                                  • EV-06

                                                                  • Digital Indicator and Controller EV-06

                                                                    Precision and reliability at a favourable price

                                                                    Universally applicable for measurement display, controlling, monitoring and counting. The new digital indicator EV-06 is even more precise, faster, more reliable and equipped with additional inputs. The vast self-monitoring and self-diagnosis system ensures high operation security. The high precision, operating mode diversity, competitive price and ease of use results in the EV-06 being a valuable investment.

                                                                    6 standard signals, EasyBus (up to 240 instruments), power suppy for sensor (24 V, 20 mA), Interface EasyBus, 2 switching outputs (5 A/10 A), PT100 (3-wire), PT1000 (2-wire), min.-/max.-value memory, thermo-elements J/K/N/S/T, scale fully adjustable, measuring of frequency, filter digital, measuring of rotation speed, alarm delay, counter with prescaler, self monitoring- and self-diagnosis system, easy to use, top quality and competitively priced, fast controlling and monitoring. For detailed specifications see operation manual.
                                                                  • EV-120

                                                                  • Digital Pressure Indicator EV-120

                                                                    For use with KELLER Series 30 Transmitters

                                                                    The EV-120 is a digital pressure indicator, designed for use in conjunction with a KELLER Series 30 transmitter. Together, these two instruments build a highly precise pressure measuring device. The EV-120 interrogates the Series 30 transmitter and updates the display two times every second. The display shows after turn-on the full-scale pressure range of the transmitter and then the actual pressure reading.

                                                                    No manual adjustments are required; the EV-120 automatically configures itself to any Series 30 transmitter. Because the pressure is communicated and read in digital format, there are no signal conversion errors.
                                                                • Tank Contents Measurement System

                                                                    • Castello

                                                                    • Tank Contents Measurement System "Castello"

                                                                      For Ventilated or Pressurised Tanks

                                                                      Castello… is a device to measure and display digitally the liquid content of any tank.

                                                                      Castello… comprises an electronics enclosure and a pressure transmitter for level measurement.

                                                                      Castello… adapts to unlimited tank shapes and sizes, offers high accuracy.

                                                                      Castello… is fully waterproof whilst providing measurement relative to atmospheric pressure.

                                                                      Castello… can be used as digital display for any 3-wire voltage output transmitter.
                                                                    • LEO 5 CA

                                                                    • Digital Manometer LEO 5 CA for Tank Content Display

                                                                      For ventilated or pressurised tanks

                                                                      LEO 5 CA offers a user-friendly way to re­present the pressure measurement at the bottom of a tank as the quantity of remaining liquid. At the push of a button, the micro­-controller performs the calculations using the information of the tank shape and dimen­sions and displays the remaining tank content quantity on the clearly legible 5-digit LED display in the desired unit (litres, gallons etc.).

                                                                      The unit is configured using a PC and the easy-to-use software so that the filling level, which determines the pressure, can be converted into an appropriate filling quantity. First the tank ­shape is selected, then the tank dimensions and the specific gravity of the liquid are entered. It contains the most current tank shapes. The program covers the most common tank shapes, but also enables any shape by entering the parameters into a specified table.

                                                                      An accuracy of the system of up to 2 mbar (corresponding to a 2 cm water column) is achieved using a computerised calibration and compensation procedure for the pressure sensors.

                                                                      LEO 5 CA makes it possible to connect various pressure probe transmitter versions (with thread, front-flush with flange, or submersible sensors).
                                                                  • Pressure Switches

                                                                      • Pressure Switches

                                                                          • dV-2 PS

                                                                          • Digital Manometer dV-2 PS with Switch Outputs

                                                                            User selected switching points and functions

                                                                            The dV-2 PS is a sophisticated digital pressure gauge with two independent pressure switch outputs. The gauge employs KELLER's proven microprocessor technology which produces highly accurate results. All readings are linearised and temperature corrected, to give an accuracy of 0,2 %FS.

                                                                            There are two independent switches for High and Low control functions. These are solid state and therefore not subject to wear. The switch points are programmed directly from the two front panel buttons and a menu system. Alternatively, the dV-2 PS can be connected via the RS485 link to a laptop/PC, and configured using KELLER's "Pressure Switch Console" software. User defined configurations can be stored on the computer for future reference. Pressure sequences can also be monitored and recorded on the PC for application diagnostic purposes using KELLER's Read30 software.
                                                                          • PA-22 PS

                                                                          • Pressure Switch PA-22 PS

                                                                            User selected switching points and functions

                                                                            The PA-22 PS is a compact programmable pressure switch and pressure transmitter. It offers continuous analog 0,5…4,5 V signal for process monitoring and switch functions to activate alarms or control relays at predetermined pressure levels.
                                                                            The PA-22PS provides two independent switches for hi/lo control functions. These solid state
                                                                            switches are not subject to wear and can be factory programmed in either PNP or NPN outputs. The optional DV-22 PP programmer (external supply) allows the user to easily change settings. This programmer can also be linked to a laptop/PC for use with Keller's "Pressure Switch Console" software.

                                                                            The following characteristics can be programmed either at the factory, or by the User via the DV-22 PP:
                                                                            • Switching thresholds
                                                                            • Hysteresis / window function
                                                                            • Normally open / normally closed
                                                                            • Switching delay
                                                                        • Pressure Calibrators

                                                                            • Pressure Calibrators, Calibrator-Device

                                                                                • Pressure Calibrators

                                                                                • Pressure Calibrators

                                                                                  Low-, Medium- and High Pressure

                                                                                  KELLER pressure calibrators are highly accurate calibration instruments which are available for the following pressure ranges: -0,85...10 bar (LPX), -0,85...25 bar (MPX) or 0...700 bar (HPX) (special measurement ranges are available on request).

                                                                                  The pressure generator is accommodated together with the pressure display in a functional housing. The pressure on a test object that is fitted to the calibrator can be built up quickly, and tracking is made easy thanks to the integrated display.

                                                                                  Measurement work is made easier by a wide range of functions, such as setting any desired pressure zero point, display of peak and trough pressure values, or leak measurements.

                                                                                  Furthermore, the applied pressure can be displayed directly on a computer via the integrated interface (USB converter), after which it can be saved and processed or managed in any desired manner.

                                                                                  The calibrator, including accessories, is supplied in a durable carrying case, making it ideal for assignments in the field.
                                                                                • Low Pressure Base

                                                                                • Calibrator-Device with Digital Manometers

                                                                                  Low Pressure Base

                                                                                  This low pressure base alllows pressure generation of up to 10 bar or negative pressure down to -850mbar.An air pump and vacuum pump are included in delivery.The pressure can precisely be set via integrated fine pressure adjuster.
                                                                                  (the base is delivered without the digital manometer)
                                                                              • Handpump

                                                                                  • Handpump HTP1

                                                                                  • Calibrator-Device with Digital Manometers

                                                                                    High Pressure-Handpump HTP1

                                                                                    This pump allows easy pressure generation up to 700 bar. Suitable pressure media are hydraulic oil or water. The oil chamber volume of 100 cm3 will fill large dead volumes.

                                                                                    The pump with its fine pressure adjuster and vent valve enables precise pressure settings, which makes it to an ideal test equipment for manometers and pressure transmitters.

                                                                                    (the HTP1 pump is delivered without the digital manometer)
                                                                                  • Handpump K/P

                                                                                  • Calibrator-Device with Digital Manometers

                                                                                    Handpump K/P

                                                                                    Negative pressures/vacuums and pressures of up to 25 bar (max. 40 bar) can be generated
                                                                                    with this pneumatic hand-pump.

                                                                                    Thanks to the fine adjustment valve (which is integrated in the pump) and the relief valve, a calibration pressure can be set accurately and quickly. This handpump is therefore highly suitable for testing manometers and pressure transmitters.
                                                                                  • HP Pump P12

                                                                                  • Calibrator-Device with Digital Manometers

                                                                                    High Pressure-Pump P12

                                                                                    This pump allows easy pressure generation up to 700 bar. The pressure media is hydraulic oil. The oil chamber volume of 148 cm3 will fill even big dead volumes.

                                                                                    The pump with its fine pressure adjuster and vent valve allows precise pressure settings, which makes it to an ideal test equipment for manometers and pressure transmitters.

                                                                                    (the pump is delivered without the digital manometer)
                                                                                • Software / Converters

                                                                                    • Software programs for Windows

                                                                                          • Installer-Updater

                                                                                          • Software Installer Updater

                                                                                            The "Software-Installer/Updater" allows to download and install KELLER-software online.

                                                                                            The installer checks the corresponding KELLER software upon start up whether a newer software resp. an update is available. Thus, you will always be working with the most current software version.

                                                                                            The installation or the update requires an Internet connection.

                                                                                            The installation of "Software-Installer/Updater" is done in three steps:

                                                                                            1. Download the Zip-File below and unpack it
                                                                                            2. Start "Launcher.exe"
                                                                                            3. Press "Install"
                                                                                          • Software Download

                                                                                          • Complete Software Download
                                                                                            KELLER Software CD
                                                                                            Article number: 750505.0001
                                                                                      • Interface Converter

                                                                                            • Converters

                                                                                            • Interface Converters

                                                                                              The communication with a KELLER device takes place over RS485. In order to read out a device via PC, a converter is needed which is able to make a conversion from RS232 to RS485 or from USB to RS485. RS232 is the designation for the serial connection on a computer (COM-connection).

                                                                                              KELLER offers converters which are precisely suited for the corresponding device. Depending on the device and connection, one can choose from a variety of different converters. The PDF-file "Overview Converters" on the right shows an overview of our different converters.