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Calibrating the controller diaLog DACb
15.1.5.2
Selection of the calibration process for the measured variable O
15.1.5.2.1
Calibration of the slope in air
100
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 influences, such as sun‐
light and wind
ð Now decide depending on the result:
Calibrate the sensor if the measured value is not 102 ±
2%SAT.
If the value is within the target range, then you can
extend the calibration interval. Repeat this process
monthly and determine from the results the optimum cali‐
bration interval for your application.
Sensor manufacturer's calibration specifi‐
cations
When determining the calibration interval,
consider the sensor operating instruc‐
tions as they may specify additional
and/or deviating calibration intervals.
Different calibration modes are offered depending on the sensor
type.
1.
Press the CAL key in the continuous display.
2.
Use OK to select the measuring channel.
ð The display appears as follows:
2
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