208 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
If you plan on calibrating the 2 cold junction compensation devices, perform this operation first
before performing any thermocouple calibrations. However, because cold junction
measurement inaccuracies will be compensated in each individual thermocouple calibration,
cold junction calibration may be skipped.
After connecting the thermocouple extension wire to the terminals, you must wait for the
terminal temperature to stabilize.
If using a compensated calibrator, input the equivalent simulated temperature values
corresponding to the REFERENCE mV values. These will be the hi and low range values for
the particular thermocouple configured.
Figure 104 is an adaptation of the wiring diagram given in the installation section of this manual. This
figure indicates how a calibration device can be connected to the appropriate terminals of an analog input
module. The calibration device(s) must have the following precision characteristics:
TC, mVolts, Volts inputs: 1 microvolt resolution
Ohms, RTD inputs: .01 ohm resolution
4-20mA inputs: 4 microamp resolution
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