Rockwell Automation 1762-IT4 Thermocouple/mV Input Module - Manual (Page 126)

Publication 1762-UM002A-EN-P - July 2002
D-4 Using Thermocouple Junctions
To prevent violation of channel-to-channel isolation:
•
For multiple exposed junction thermocouples, do not allow the
measuring junctions to make direct contact with electrically
conductive process material.
•
Preferably use a single exposed junction thermocouple with
multiple ungrounded junction thermocouples.
•
Consider using all ungrounded junction thermocouples instead
of the exposed junction type.