Temperature coefficients (TC) of pressure sensors

Since temperature affects the measuring accuracy of a pressure sensor, there always remains a small temperature error in the rated temperature range despite a wide range of compensation measures. This error is frequently expressed in the info sheets of manufacturers of pressure sensors as temperature coefficient (abbr. TC). This coefficient describes a (linear) error, starting from a reference point, which generally is room temperature.
Accordingly, the temperature error 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 also that of the span (TCC) must be considered individually. The zero-point error describes the result of temperature on the zero signal. The error of the span specifies the result of temperature on the entire scale value. The average person temperature coefficients of zero point and of span are usually specified as magnitudes, meaning that they might be either positive or negative.
If within Murder -point error has the same sign because the error of the span, both of these temperature errors may add up in worst case. An average value for the common zero-point temperature coefficient of a pressure sensor is: 0.2 % / 10 K. Connect to WIKA pressure sensors.

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