Honeywell UDC2500 manual Upper Display = Aply Lower Display = IN1SPN, If … Then …

Input Calibration

Step

Operation

Press

Result

3Calibrate 100 %

Function

You will see:

Upper Display = APLY ( 2 )

Lower Display = IN1SPN (10003)

4Check the Cold Junction Temperature

5Exit the Calibration Mode

Function

Function

then

Lower

Display

•Adjust your calibration device to an output signal equal to the 100 % range value for your particular input sensor. See Table 5-1for Voltage, Degrees, or Resistance equivalents for 100 % range values.

•Wait 15 seconds, and

If …	Then …
you are calibrating a Thermocouple input	go to step 4
you are calibrating other than a	go to step 5
Thermocouple input

The calculations for zero and span are now stored and you will see:

Upper Display = The cold junction temperature at the rear terminals

Lower Display = CJTEMP (10004)

The value in the upper display is in tenths of a degree. It is the current reading of the temperature as measured at the thermocouple terminals and recognized by the controller.

You can change this value, if it is in error, using the orkeys.

WARNING: The accuracy of the controller is directly affected by the accuracy of this value. It is recommended that this value not be changed under normal circumstances.

The controller stores the calibration constants and exits the calibration mode.

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