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MCT4 Calibration Offset Adjustment

Please see attached or link below for a tutorial on adjusting the calibration offset on the MCT4 control

MCT4 Calibration Offset Tutorial


Below is a transcript of the video tutorial


MCT4 Calibration Offset adjustment

The MCT4 control has a 2-point low and high range offset calibration for the Loop inputs, and a single point offset calibration for the limit input.  

To access the Calibration offset settings, follow the following key presses.

Menu

Settings

Menu

Offline

Yes

Menu

Calibrate

Select between the Loop and Limit inputs with the left and right arrows.

Perform User Calibration Offset

The Process Value shows the corrected Process value display after the offset correction has been applied.   The low point Offset value is the amount of offset applied at the low temperature range.  For a J type thermocouple this is at -120 degrees C.

Touch the low Point Offset value, and a keypad will appear to enter the desired value.

Press Done, and the Process Value will show the effect of the offset.

Touch Press to Display adjust High Point Offset

The Process Value shows the corrected Process value display after the offset correction has been applied.   The high point Offset value is the amount of offset applied at the high temperature range.  

For a J type thermocouple this is at 1000 degrees C.

Repeat the process to enter the High Point Offset.

Press Done, when complete.

Note the Displayed value is a function of both the Low point and High point calibration offset values.   The User calibration is a straight line between the low and high point introduced offset values.  You may need to go back and forth to adjust the high and low offset points to get the results you want, as changing one value will almost always affect the other.

In this example a -5 was entered for both the low and high point offsets and the displayed PV was lowered by 5 degrees.

The Limit Calibrate screen is just a single offset value where the same offset is applied throughout the entire range.

This completes our tutorial on the calibration offset function of the MCT4 control.

D
Dan is the author of this solution article.

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