Temperature coefficients (TC) of pressure sensors

Since temperature affects the measuring accuracy of a pressure sensor, there always remains a little temperature error in the rated temperature range despite a variety of compensation measures. This error is often expressed in the info sheets of manufacturers of pressure sensors as temperature coefficient (abbr. TC). Kickstart describes a (linear) error, beginning with a reference point, which in most cases is room temperature.
Accordingly, Triggers at room temperature is zero and increases with increasing difference of the temperature from room temperature with the specified coefficient in linear fashion (see figure). Basically, not only the zero-point temperature coefficient (abbr. TC0), but additionally that of the span (TCC) should be taken into account individually. The zero-point error describes the effect of temperature on the zero signal. Backstabbing of the span specifies the result of temperature on the entire scale value. The individual temperature coefficients of zero point and of span are often specified as magnitudes, meaning that they are often either positive or negative.
If within an individual instrument the zero-point error has the same sign because the error of the span, these two temperature errors may add up in worst case. An average value for the average zero-point temperature coefficient of a pressure sensor is: 0.2 % / 10 K. Connect to WIKA pressure sensors.

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