Pt100 / Pt1000 / Thermocouple offset adjustment
Adjusting the ZeroPoint constant compensates for an offset error in the temperature sensor.
(See also: Zeropoint.)
Drift (offset) is compensated by changing the ZeroPoint constant.
Calculation of new ZeroPoint:
When the real process temperature is known, the new ZeroPoint can be calculated as:
New_ZeroPoint = ZeroPoint + (RealTemperature - AnalogIn)
This re-calibration can be performed manually or by the controller in a situation where the exact temperature is known.
Pt100 / Pt1000 / Thermocouple input scaling
Application note for PD 640 (mA)
Application note for PD 641 / 643 (Pt100 / Pt1000)
Application note for PD 642 / 643 (mV / thermocouple)