Allen-Bradley MicroLogix 1200 User Manual page 126

D-4 Using Thermocouple Junctions
Publication 1762-UM002A-EN-P - July 2002
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.