10.8.3 Calibrating conductive
conductivity, temperature
coefficient
Prerequisite for calibration. The conductivity
sensor is connected. The conductivity sensor is
in a suitable liquid, e.g. a sample from the
bypass fitting.
1. Press in the continuous display.
2. Use the arrow keys to select the
channel which should be calibrated.
3. Then press
ð
You will see the display with the
menu for selection of
[Cell constant]
or
[Temp. coefficient]
.
Check the
[Temp. coefficient]
4. Use the arrow keys to select
[Temp. coefficient]
.
5. Continue with .
ð
You will see the current data for the
[Temp. coefficient]
.
6. Continue with .
ð
The sensor signal stability will be
displayed – the temperature values
relate to the temperature difference
of the medium:
n low (< 10 °C is too low),
n good (> 10 °C is good),
n very good (> 15 °C is very
good).
is displayed if the bar graph is in
the "good" area.
7. Warm up the conductivity calibration sol‐
ution by at least 10 °C but better by 15
°C while the conductivity sensor is in the
conductivity calibration solution.
ð
The
[Sensor signal stability]
bar
moves now to the right.
If
[low]
is displayed, then repeat the
process at a temperature of 1 ... 2
°C higher. If
[low]
continues to be
displayed, then the sensor is faulty.
With
[good]
and
[very good]
, con‐
tinue with .
8. Apply the result of the calibration by
pressing .
ð
The controller shows the calibration
menu again and operates with the
results of the calibration.
Incorrect calibration
An error message appears
if the result of the calibra‐
tion lies outside the speci‐
fied tolerance limits. In this
case, the current calibration
is not carried over.
Check the prerequisites for
calibration and eliminate
the error. Then repeat cali‐
bration.
Calibration
119
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