[ATR121] ATR121-AD with PT100 reading error
Posted: 20/07/2015, 16:01
We have the above unit operating with a PT100
SEn set to PtI
The relays operate at the correct temperature according to the display.
e.g. display =80 deg C
Relay prog to change at 80 deg C and the relay changes in line with the display.
The problem is that with a separate sensor (thermocouple) at the same location it is reading approx. 105 deg C
We have checked RTD
RTD wiring
and consider they are ok
Is there a reason for this type of offset??
SEn set to PtI
The relays operate at the correct temperature according to the display.
e.g. display =80 deg C
Relay prog to change at 80 deg C and the relay changes in line with the display.
The problem is that with a separate sensor (thermocouple) at the same location it is reading approx. 105 deg C
We have checked RTD
RTD wiring
and consider they are ok
Is there a reason for this type of offset??