Temperature Measurement


Temperature signal conditioning of non-linear devices

December 2003 Temperature Measurement

Most temperature transducers have non-linear functions in relation to temperature. The physical properties that we use to derive the temperature reading are rarely linear. To use these in a control system or even for simple readout one linearises the physical property to the temperature scale.

The common transducers used for temperature are normally signal conditioned to standard instrumentation signals eg, 4 to 20 mA. However, one often encounters devices that are not commonly catered for. An example is an optical pyrometer.

Omniflex has released a programmable transmitter with the facility to linearise signals to suit specific applications. Simple (and free) PC-based software is used to implement the lineariser function and downloaded to the universal programmable transmitter using a programming cable.

The illustration shows graphically the input signal and required output.

Typical applications would include:

* Optical pyrometers.

* Thermisters.

* Exotic thermocouples or RTDs.

* Tank level in cylinders using level probes.

* Reverse acting controllers.

* Signal inversion 4 to 20 m A to 20 to 4 mA.

* Special response curves.

For more information contact Ian Loudon, Omniflex, 031 207 7466, sales@omniflex.com, www.omniflex.com



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