Emerson ROC827 User Manual
Page 124
ROC827 Instruction Manual
Issued Mar-06
Troubleshooting
6-12
4.
Verify the thermocouples have the correct construction (ungrounded)
and are not grounded by other means.
5.
Verify you are using the correct thermocouple wire all the way from
the thermocouple to the ROC827 with minimal connections.
6.
Verify the wiring run is adequately protected from noise.
7.
Test the thermocouple reading from the thermocouple to a meter, and
then generate a signal into the ROC827 as described previously.
8.
Finally, connect a thermocouple of the same type directly to the
ROC827. If it reads correctly, the problem is likely to be in the wiring
to the field or may be related to a ground loop.