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High accuracy pressure transmitters

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SWISS pressure transmitter manufacturer, Keller AG, Switzerland, has announced the release of their new Series 33 and 35S digitally compensated pressure transmitters and transducers.

Available from Technical & Scientific Equipment , the new series utilises the latest in microprocessor technology to provide pressure measurements with a remarkable total error band of a mere 0.1% FS.

Included in the error band is non-linearity, hysteresis, repeatability, and temperature from -10 to +80°C. A typical application is monitoring pressure losses, or leaks, in fluid pressure lines.

An innovation now used extensively throughout the Keller range, including the 33 and 35S series, is the unique sensing element.

The etched silicon semiconductor element is enclosed in an oil filled capsule. The transmitter diaphragm forms one face of the capsule and, therefore, the pressure being measured is transferred to the sensing element hydraulically.

This principle is used in preference to the conventional method of bonding the semiconductor element to the back of the diaphragm.

Accordingly, the sensing element of Keller pressure transmitters is insulated from damage by high-pressure transients, as well as thermal shock, and the life and accuracy of the transmitter is extended indefinitely.

The Keller 33 and 35S series are now available with a choice of industry standard output signals, and a recessed or flush diaphragm. Pressure ranges are available from -1 to +1000Bar.

According to TSE, the Australian distributor of Keller, the new series are very competitive, considering its performance.

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