10.5 Calibrating the oxygen
sensor
10.5.1 Specify the calibration
interval
The calibration interval depends strongly on:
n the application
n the installation location of the sensor
If you wish to calibrate a sensor for a special
application and/or a special installation location,
then you can determine the calibration intervals
using the following method. Check the sensor,
e.g. one month after its commissioning:
1. Take the sensor out of the medium
2. Clean the outside of the sensor with a
damp cloth
3. Then gently dry the sensor diaphragm,
e.g. using a paper towel
4. After 20 minutes, measure the oxygen
saturation index in the air
5. Protect the sensor against external influ‐
ences, such as sunlight and wind
ð
Now decide depending on the
result:
Calibrate the sensor if the meas‐
ured value is not 102 ± 2%SAT.
If the value is within the target
range, then you can extend the cal‐
ibration interval. Repeat this
process monthly and determine
from the results the optimum cali‐
bration interval for your application.
Sensor manufactur‐
er’s calibration specifica‐
tions
When determining the cali‐
bration interval, consider
the sensor operating
instructions as they may
specify additional and/or
deviating calibration inter‐
vals.
10.5.2 Selection of the calibration
process for the measured
variable O
2
Different calibration modes are offered
depending on the sensor type.
Calibration
109
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