Since ไดอะแฟรม affects the measuring accuracy of a pressure sensor, there always remains a small 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). 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 merely the zero-point temperature coefficient (abbr. TC0), but additionally that of the span (TCC) must be taken into account individually. The zero-point error describes the effect of temperature on the zero signal. The error of the span specifies the result of temperature on the full scale value. The individual temperature coefficients of zero point and of span are usually specified as magnitudes, and therefore they might be either positive or negative.
If within เพรสเชอร์เกจ -point error has the same sign because the error of the span, both of these temperature errors may accumulate in worst case. A typical value for the common zero-point temperature coefficient of a pressure sensor is: 0.2 % / 10 K. diaphragm seal to WIKA pressure sensors.