With more than three decades in the industry, we are Europe's leading manufacturer of isolated pressure transducers and transmitters, producing more than 1.1 million isolated measuring cells in 2008 alone. We offer high volume and flexibility at low prices. Our company was formed in 1974 by Hannes W. Keller, a physics graduate of the Swiss Federal Institute of Technology. Keller products are in use around the world wherever a pressure quantity needs to be converted to an electrical quantity; in applications such as hydraulic systems, aircraft cabin pressure regulation, dive computers, air conditioning systems and tank and water level monitoring. Our miniature pressure sensors and probes are in use in medical, industrial and aerodynamic research applications. We manufacture pressure sensors, transmitters, transducers and switches, as well as calibrators, gauges, tank content measurement systems, manometers, remote data transmitters and digital indicators. Our instruments cover pressures ranging from 5 millibar to 2000 bar. We also offer software packages for computer managing of data and instruments. Our products and processes carry a wide range of quality certifications, including ISO 9001 / EN 29001, ATEX, UL, FM, and ECE.
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Thanks to a new technique we developed for laser welding very thin stainless steel media isolation diaphragms, the Series 3L to 10L OEM Pressure Transducers feature crevice free diaphragms and smaller capsule dimensions while retaining the high levels of stability, performance and quality our customers have come to expect from Keller products.
With this new laser welded technology, we can produce transducers with diameters as small as 9.5 mm, depending on the pressure range measurement required. Lower pressures require larger diameters than higher pressures. We supply each transducer with a calibration sheet that details its sensitivity and compensation factors.
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The premium product of our OEM line, we have been producing Series 10 Piezoresistive Pressure Transducers for more than three decades. Several million Series 10 pressure transducers are in use around the world in applications such as pneumatics, avionics and hydraulics.
Series 10 pressure transducers feature a highly sensitive piezoresistive silicon chip sealed inside a protective stainless steel housing filled with silicon oil that transfers pressure from the diaphragm to the sensor. Each Series 10 pressure transducer is supplied with electrical leadouts and an engraved serial number. Pressure ranges from 100 millibar to 1000 bar are covered.
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The sophisticated dV2 PS Digital Manometer features two independent pressure switch outputs and offers high accuracy to 0.2 % FS with temperature corrected and linearised readings. It is IP64 rated, with a temperature range of 0 to 50 degrees Celsius.
The independent High and Low control switches are not subject to wear, as they are solid state. They can be programmed directly from the manometer's front panel or via an RS485 link to a PC running the Keller Pressure Switch Console software. The latter allows storage of user-defined configurations. Monitoring and recording of pressure sequences can be achieved with Keller's Read30 software.
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The compact PA-22 PS programmable pressure switch features an analog transmitter output signal for continuous process monitoring. User selected switch functions can be used to control relays or activate alarms at predetermined pressure levels.
The PA-22 has two solid state independent switches for high and low control functions. Outputs are factory set to PNP or NPN as specified by the customer.
The PA-22 pressure switch can also be used with the dV-22 PP programmer to enable setting changes via the dV-22 buttons and menu or optionally by Keller's Pressure Switch Console software.
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The LEO Record (Ei) digital manometers with record function are autonomous instruments with their own battery. They are designed for long-term recording of temperature and pressure. Piezoresistive and capacitive versions, as well as intrinsically safe models, are available.
Features of the LEO Record digital manometers include:
- Non-volatile memory for data security
- Digital display of actual pressure and record status
- Robust construction with high resolution and measuring accuracy
- IP65 protection
- Logger 4.x configuration software for PC or PDA
The capacitive LEO Record pressure ranges are from 30 to 300 millibars, and the piezoresistive LEO record pressure ranges include pressures as low as -1 bar and as high as 1000 bar.
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Pressure gauges, switches and transmitters require precision calibration. We offer robust and accurate low, medium and high Pressure Calibrators that are perfect for onsite and outdoor use.
The pressure ranges for the calibrators are as follows:
- Low Pressure: -1 to 10 bar
- Medium Pressure: -1 to 25 bar
- High Pressure: 0 to 700 bar
The low and medium pressure calibration ranges are pneumatic, while the high pressure calibrators are hydraulic. All Keller pressure calibrators are constructed with a portable housing that incorporates the measuring electronics, pressure generating pump and a high precision reference sensor.
Many different measuring tasks can be undertaken, and optionally measurements can be transferred via the serial port to a PC running the Logger Software for further data processing.
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Our LC family of Series 4 through Series 9 miniature OEM pressure transmitters take advantage of the Chip-in-Oil technology we developed, which allows all key measuring components to be integrated into a miniature, hermetically sealed oil-filled housing of high-grade steel. This results in a compact package which can be easily integrated into an OEM product.
These pressure transmitters feature both analog and digital output signals. The transmitters can be used at operating temperatures between -40C and +150C with the analog output, and at temperatures between -40C and +80C with the digital output.
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The fast, precise and reliable EV-94 EB Digital Indicator for transmitters offers high operational security with self-monitoring and self-diagnosis at an economical price. The EV-94 EB is suitable for a wide range of applications, including:
- Measurement / display of pressure, temperature, flow, power, frequency or any
other parameter
- Monitoring, counting and controlling
- Analog - digital conversion
- Long-term monitoring and recording
The EV-94 EB features six standard signals, two switching outputs, adjustable scale, counter with prescaler and EasyBus connection of up to 240 instruments with easy to use results.
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http://www.keller-pressure.co.uk
