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 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. Adaptable ), but also that of the span (TCC) should be considered 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 entire 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 in an individual instrument the zero-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 average zero-point temperature coefficient of a pressure sensor is: 0.2 % / 10 K. Connect to WIKA pressure sensors.