Measuring errors based on ambient conditions and the diaphragm seals' fill physical properties cause temperature-related errors when connected to pressure, absolute pressure, or level transmitters.
Three major factors contribute to thermal error:
- Type of fill fluid used
- Fill fluid volume
- Diaphragm flexibility
The choice of fill fluid contributes directly to thermal errors in proportion to the coefficient of thermal expansion of the fluid. The resulting internal pressures produce adverse forces on the diaphragm which in turn are reflected in the pressure instrument.
