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Calibrating the controller diaLog DACb
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.
Buffer used
Dispose of the used buffer solution. For more infor‐
mation: refer to the buffer solution safety data
sheet.
You need one test container with a buffer solution for calibration.
Continuous display ➨
CAL ORP
Offset
Last calibration
CAL setup
Calibration process
Pot. equalisation
continue with <CAL>
Fig. 46: 1-point calibration of ORP sensor (CAL)
1.
Continue with
0.0 mV
13:26:11
11/04/2013
1 point
No
A1027
85
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