Customer calibration – Carbolite 302P4 User Manual
Page 22
Programming
22
MC22 -GB-v1.01
5.1
Customer Calibration
The 302P controller is calibrated for life at manufacture, there may however be sensor or
other system errors, which affect the accuracy of the measured temperature. Customer
calibration can be used to compensate for these errors.
Ensure the controller is in the Enhanced mode OP.E
1 Point Calibration CL.St = C.CL1
1 point calibration uses one offset value across the temperature range.
Clear any previous coefficient adjustment.
Press function
until CL.St is shown in the lower display
Press the Up
or Down
to C.CL1 in the upper display
Press function
to confirm selection and display OFSt
Press the Up
or Down
to enter the offset value required across the temperature range.
This can be a negative or positive value.
Press function
to confirm selection.
2 Point Calibration CL.St = C.CL2
2 point calibration uses two offset values at two corresponding temperatures; this changes
the calibration linearly as the temperature increases or decreases.
Clear any previous coefficient adjustment.
Press function
until CL.St is shown in the lower display
Press the Up
or Down
to C.CL2 in the upper display
Press function
until CAL.L is displayed
Press the Up
or Down
to enter the lower calibration temperature to which the offset is to
be applied. Example. 300°C.
Press function
until OFS.L is displayed
Press the Up
or Down
to enter the offset to be applied to the lower calibration
temperature. Example: If at the calibrated temperature of 300°C the controller is reading
296.7, the offset will be 3.3°C (300-296.7 = 3.3)