See link below for a video explaining the calibration offset feature of the MCT4 control.
Attached is a Excel spread sheet to help calculate required offset settings.
Below is a transcript of the video.
Attached is a spreadsheet calculator to help you find the needed offsets for your test data.
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 a 0 degrees C, or 0 degrees F, depending on the configuration of the control.
Touch the low Point Offset value, and a keypad will appear to enter the desired value.
In this example we will enter an offset of minus five degrees.
Touch Press to Display adjust High Point Offset
The High Point offset value, is the amount of offset applied a 100 degrees C, or 100 degrees F, depending on the configuration of the control.
Repeat the process to enter the high point offset
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 offsets, and the displayed process Value was lowered by 5 degrees.
Press done, then the right arrow, to switch to the limit calibrate screen.
The Limit Calibrate screen is just a single offset value where the same offset is applied throughout the entire range.
In this example we will enter an offset of minus six degrees.
Press done, then home.
The Loop 1 and limit PV values are now showing the corrected values.
This completes our tutorial on the calibration offset function of the MCT4 control.