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15.1.2.3
Calibration data for ORP sensor (CAL)
Calibrating the controller diaLog DACb
6.
Press
7.
Transfer the result of the calibration into the controller
memory by pressing
ð The controller operates with the calibration results.
Correct sensor operation
Correct measuring and metering is only pos‐
–
sible if the sensor is working perfectly
Refer to the sensor's operating instructions
–
Remove the sensor from the in-line probe
–
housing and re-fit it for calibration. To do this,
refer to the operating instructions for your in-
line probe housing
ORP sensor calibration
The ORP sensor cannot be calibrated. Only an
'OFFSET' deviation of magnitude ± 40 mV can be
set and thus compensated. If the ORP sensor
deviates by more than ± 40 mV from the reference
value, then it must be checked in accordance with
the requirements of the sensor operating instruc‐
tions.
Measuring and control behaviour of the controller
during calibration
During calibration the actuating outputs are deacti‐
vated. 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 suc‐
cessfully, 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.
87
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