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Home / Articles and Press Releases / Press Release / Range of Pressure Transmitters for Use in Hazardous Areas

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Press Release

Range of Pressure Transmitters for Use in Hazardous Areas

By Keller

| Read Bio

Published: January 17th, 2018

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Keller AG has now introduced a complete range of pressure transmitters for use in hazardous areas. These intrinsically safe transmitters offer measurement ranges of between 0,2 bar and 1000 bar, so they can be used for measurements of all types in areas subject to explosion hazards in Group II (Gas), and as per the relevant ATEX Directive. Individual types from the product range are also approved for Group I (Mining) respectively Group II (Dust).

Common features of all Y-line pressure transmitters include a very low temperature error, with correspondingly high measurement accuracy. Thanks to the integrated temperature sensor and an additional digital circuit, the range of envisaged operating temperatures can be divided into as many as 120 sections with a width of 1.5 Kelvin. During factory calibration, a mathematical model is used to calculate individual compensation values for TK zero point and TK amplification for each of these sections; the values are then stored in the transmitter. During operation, these values are fed into the analog signal path according to the temperature, without reducing the 2 kHz signal processing dynamic. A relevant total error band for measurement purposes of ±0,8 %FS can therefore be attained over the typical temperature range of -10 °C to +80 °C. This includes all error sources, from linearity to range tolerance.

As an additional feature, Keller’s X-line pressure transmitters (Series 30) offer 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 on the basis of an error bandwidth within the overall compensated pressure and temperature range. The user of industrial transmitters may specify a choice of compensated temperature range at time of purchase, depending upon the application; i.e., either -10…80 °C or 10…40°C. Otherwise, level transmitters are provided with a compensated range of 0…50°C. The calculated pressure value can be read via the interface, and is simultaneously processed as an analog signal. At the digital output, the error band between 10…40°C is a maximum of ±0,05% of the full range.

A varied selection of structural designs, electrical signals and mechanical connection formats guarantee that these intrinsically safe pressure transmitters can be used for an extensive range of applications. The range includes models with internal seals as well as fully welded and flush front-sealed versions that measure pressure in absolute or barometric terms, or relative to ambient pressure. Various threads are available for the pressure connection, and different plugs and cables can be used for the electrical connection.

Users can also choose between typical industrial measurement signals with 3-wire technology (0…5V / 0 … 10 V) or 2-wire technology (4…20 mA); on the high-precision pressure transmitters and submersible sensors in Series 30, an additional RS485 interface is available in addition to the analog output.

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ABOUT THE AUTHOR

Keller

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”.

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