Incorrect calibration
Should the result of the cal‐
ibration lie outside the
specified tolerance limits,
an error message appears.
In this case the current cal‐
ibration will not be applied.
Check the prerequisites for
the calibration and clear
the error. Then repeat the
calibration
9.5 Calibrating Oxygen Sensors
Specifying the calibration interval
The calibration interval depends heavily
on:
n the application
n the installation location of the sensor
If you wish to calibrate a sensor for a spe‐
cial application and/or a special installa‐
tion location, then you can determine the
calibration intervals using the following
method. Check the sensor, e.g. one
month after commissioning:
1. Remove the sensor from the
medium
2. Clean the outside of the sensor with
a damp cloth
3. Then gently dry the sensor mem‐
brane for example using a paper
towel
4. After 20 minutes measure the
oxygen saturation index in the air
5. Protect the sensor from external
influences, such as sunlight and
wind
ð
Now decide depending on the
expected result:
Amperometric sensor: Calibrate
the sensor if the measured
value is not 102 ± 2 %SAT.
If the value is within the set‐
point range, then you can
extend the calibration interval.
Repeat this process monthly
and determine the optimum cal‐
ibration interval for your appli‐
cation from the results.
Calibration
90
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