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How to Thermally Compensate a Sensor


July 01, 2020

Pressure transducers all have some degree of variation in output caused by changes in temperature. The best way to compensate for such variation is to employ components on the PCBA that respond to temperature. These components can be fixed in value, adjustable like a potentiometer, or feed into a digital circuit.

For components with fixed values, the compensation is done during the design of the transducer. When worked into the design, temperature compensation carries through to all versions of the product.

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For components adjustable like a potentiometer, the unit is first calibrated at room temperature. Then, it is tested at different high and low temperatures while the operator adjusts the thermal compensation components to bring the output within specification.

For components fed into a digital circuit, a software program reads the output and adjusts values within the code to provide thermal compensation. Components fed into a digital circuit can also be provided with fixed compensation, where the values are set to the average needed for a range or model.

Topics: General Industrial