10.1.4 Calibration of the pH Sensor (CAL) by
[Data Input]
Data input
With the [Data input] calibration method, the known data of the sensor is entered in the con‐
troller. Calibration by data input is only as accurate and reliable as the method with which
the data was determined.
The sensor data must have been determined recently. The more up-to-date the sensor data,
the more reliable is this calibration method.
Correct sensor operation
–
Correct measuring and metering is only possible if the sensor is working perfectly.
–
Refer to the sensor's operating instructions.
Measuring and control behaviour of the controller during calibration
During calibration the actuating outputs are deactivated. Exception: a basic load or a manual
control variable has been set. This remains active. The measured value output
[standard signal output mA] is frozen, corresponding to its settings in the mA output menu.
When calibration/testing has been completed successfully, all of the error checks relating to
the measured value are restarted. The controller saves all the determined data for zero point
and slope upon a successful calibration.
Calibration
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