Since temperature affects the measuring accuracy of a pressure sensor, there always remains a little temperature error in the rated temperature range despite an array 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, beginning with 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 also that of the span (TCC) must be taken into account individually. The zero-point error describes the result of temperature on the zero signal. The error of the span specifies the effect of temperature on the full scale value. The individual temperature coefficients of zero point and of span are often specified as magnitudes, and therefore they are often either positive or negative.
If within an individual instrument the zero-point error has the same sign as the error of the span, both of these temperature errors may add up in worst case. A typical value for the common zero-point temperature coefficient of a pressure sensor is: 0.2 % / 10 K. pressure gauge to WIKA pressure sensors.