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Pt100 / Pt1000 / Thermocouple offset adjustment.

 

Adjusting the ZeroPoint constant compensates for an offset error in the temperature sensor.

 

(See also: Zeropoint.)

 

ZeroPoint adjustment:

 

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.

 

Related Topics

Signal filter

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)

Analogue modules