ProFire PF3100 Series Product Manual page 6

Terminal Descriptions
All Thermocouple Terminals
All thermocouples must be Type K "ungrounded." All thermocouple negative terminals connect to red Type K
wire, and all thermocouple positive terminals connect to yellow Type K wire.
Single element thermocouples are NOT considered safety rated and should only be used for monitoring non-
safety critical processes.
Dual element thermocouples ARE considered safety rated when configured in software as such, and when wired
correctly. These inputs may be used for monitoring safety critical processes.
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PF3100 Thermocouple Card Product Manual
Page 6 of 11