Honeywell UDC 3300 manual Step Description, If… Then…

Step

3

Description

Calibrate 100 %

Press

FUNCTION

LOOP 1/2

Action

You will see:

Upper Display

APPLY

Lower Display

INn SPAN n = 1, 2, or 3

Adjust your calibration device to an output signal equal to the 100 % range value for your particular input sensor. See Table 7-1 for Voltage or Resistance equivalents.

Wait 15 seconds, and

If…	Then…
you are calibrating a	Go to step 4
thermocouple input
(Input 1 or 2)
you are calibrating other	Go to step 5
than a thermocouple input

4

5

Check the Cold Junction Temperature

CAUTION The

accuracy of the controller is directly affected by the accuracy of this value.

Change this value only if the zero and span calibration procedures did not bring the controller within the specified accuracy requirements.

Exit the Calibration Mode

FUNCTION

LOOP 1/2

FUNCTION

LOOP 1/2

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

Upper Display

	The cold junction
	temperature at the
Lower Display
	rear terminals

C-J TEMP

The value in the upper display is in the 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 or key.

ATTENTION When calibrating T/C inputs using a precision 500-ohm resistor, calibrate the cold junction as 77°F (25°C).

The controller will store the calibration constants and exit calibration mode.

230 UDC 3300 Process Controller Product Manual 4/00