Commissioning Oxymax COS22
20 Endress+Hauser
8.3 Sensor calibration
Calibrate the sensor (e.g. air calibration) immediately after the polarization time runs out.
The calibration intervals depend greatly on:
• The application
• The installation position of the sensor
The following method helps you determine the necessary calibration intervals:
1. Inspect the sensor one month after commissioning. Take it out of the medium and
dry it.
2. After 10 minutes, measure the oxygen saturation index in air.
Decide depending on the result: If the measured value is not 100 ±2 %SAT, you
must calibrate the sensor. Otherwise, double the length of time to the next
inspection.
3. Proceed as per Point 1 after two, four and/or eight months. In this way, you can
determine the optimum calibration interval for your sensor.
In any case, calibrate the sensor at least once a year.
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