Pressure measurement

There are many different types of fill fluid used within the metallic measuring cells of pressure transmitters (and their diaphragm seals if specified). The fill fluid used is dependent on the requirements of the intended application, influenced by factors such as the required operating temperature, compliance with FDA requirements or simply to comply with the requirements of site. Find the pressure transmitter that's right for your application with our product finder.

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Differential pressure transmitters commonly operate around a central measuring cell. Independent pressures are applied to either side of the measuring cell and if those pressures are the same, the cell remains in a common neutral position. Should one pressure increase above the other, this will force the measuring cell to deflect, creating a positive (or negative depending on orientation) reading. Find out more about differential pressure measurement.

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Pressure transmitter drift can be the result of a damaged instrument, an incorrect installation or even a process anomaly. Commonly, instrument drift can occur with fluid filled measurement cells when there are significant temperature fluctuations within the measured medium or the atmospheric temperature. If an initial review of the instruments condition and application doesn’t highlight a reason for instrument drift then support from the manufacturer should be sought. Get in touch for support.

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Diaphragm seals have a multitude of applications in process measurements. They can be used to protect the instrument head from high temperatures or high vibrations, allow fitments in tight installations or link two points of measure back to a common transmitter. The use of diaphragm seals can increase the potential for error in measurement though so they should only be used where necessary. Speak to our experts for further information.

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Pressure transmitters can be calibrated dry (without the presence of a reference pressure) or wet (with the presence of a reference pressure).

Steps for a dry calibration:

1. Select ‘Pressure’ via the measuring mode parameter

2. Select a pressure unit via the “Press eng. Unit” (for example mbar)

3. Select “Set the LRV” parameter to enter the low range value (for example 0 mbar) for a dry calibration

4. Select “Set the URV” parameter to enter the upper range value (for example 200 mbar)

Contact us for further help

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