Measuring and control behaviour
of the controller during calibration
During calibration the actuating out‐
puts are deactivated. Exception: a
basic load or a manual control vari‐
able 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.
NOTICE!
Prerequisites for a correct calibration
of the sensor zero point
– The run in period for the sensor
has been adhered to
– There is permitted and constant
flow at the in-line probe housing
– There is temperature balance
between the sensor and the
sample water
– There is a constant pH value in
the permitted range
1.
Press the key in the continuous
display.
2. Using the arrow keys select the
[Zero point]
3.
Then press
CAL Cl
A1046
Accept with <CAL>
Zero point
Range
Fig. 60: Calibration of zero point
4.
Then press
CAL Cl
A1048
continue with <CAL>
Zero point
Slope
Calibration successful
Fig. 61: Calibration of zero point
5.
Import the result of the calibration
into the controller memory by
pressing the key
ð
The controller displays the con‐
tinuous display again and oper‐
ates with the results of the cali‐
bration.
Calibration
89
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