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7 IOP Calibration Procedures
7.11 Thermocouple Input Accuracy Verification
R688 HPM High-Performance Process Manager Service 457
December 2020 Honeywell
7.11 Thermocouple Input Accuracy Verification
Introduction
It is necessary to verify the accuracy of a thermocouple input. Verification is accomplished with the use
of a precision Thermocouple Simulator, the instrument’s operating procedure, and the procedure steps
that follow.
Accuracy verification procedure
Perform the following steps to verify the accuracy of the thermocouple.
Step
Action
1
Be sure the equipment is properly installed in the cabinet.
2
Connect a reference grade thermocouple wire between the Thermocouple Simulator
and one input of the process control system.
3
Install all equipment covers and close the cabinet doors.
4
Using the HPM Detail Status display at the Universal Station, disable the Open
Thermocouple Detection mode for the control point.
5
Allow the equipment to operate normally for 2 hours while temperature gradients
stabilize.
6
Verify the accuracy of the thermocouple using the Thermocouple Simulator and
following its operating procedure.
7
Move the thermocouple reference wire to another thermocouple input from the process
control system and repeat the above procedures, starting at step 3.