Calibration Of The Ph Sensor (Cal) By Data Input - ProMinent DULCOMETER Assembly And Operating Instructions Manual

Calibrating the controller
9.1.4

Calibration of the pH sensor (CAL) by data input

Data input
Using the calibration method [Calibration of the pH sensor (CAL) by data input], the
known data of the sensor are entered in the controller. The calibration by data input
is only as accurate and reliable as the method with which the data were 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 per‐
–
fectly
Observe the sensor 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.
70