Since digital pressure gauge affects the measuring accuracy of a pressure sensor, there always remains a little temperature error in the rated temperature range despite a wide range of compensation measures. This error is often expressed in the data sheets of manufacturers of pressure sensors as temperature coefficient (abbr. TC). This coefficient describes a (linear) error, beginning with a reference point, which in most cases 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. pressure gauge octa ), but additionally that of the span (TCC) must be considered 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. เพรสเชอร์เกจ of zero point and of span are often specified as magnitudes, meaning that they might be either positive or negative.
If in an individual instrument the zero-point error gets the same sign as the error of the span, these two 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. Link to WIKA pressure sensors.