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Temperature Compensation for Pressure Transducers

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tjia123

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Hello All.

The problem I have is getting a transducer to compensate with temperature; there is no thermal shift when temperature is increased or decreased. The wheatstone bridge which consists of a full bridge strain gauges are embedded in the transducer itself. I am using INA125, an instrumentation amplifier IC to complement for gain when pressure is increased. Right now, I have no problems with the gain (using a POT across R6, along with Rgain) but getting inconsistent output level at varying temperatures.

I've tried using specialized resistors (with low TC), bondable resistors and thermistor/resistor ladder network but had no success. Any help is greatly appreciated.
 

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I think that first of all you should take several measurements at steady pressures in order to understand exactly how temperature variation affects the output concerning to linearity, shift, and slope. Only after defining the model that describes how circuit behaves along temperature change is that would be possible to know at which part of the circuit you should adapt.
 

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