21
Calibration / Adjustment
Recommendations for Calibration
It is always recommended to calibrate in air. Compared to water, air is a calibra-
tion medium which is easy to handle, stable, and thus safe. In the most cases,
however, the sensor must be dismounted for a calibration in air. In certain pro-
cesses the sensor cannot be removed for calibration. Here, calibration must be
performed directly in the process medium (e.g. with aeration).
For applications where concentration is measured, calibration in air has proved
to be useful.
Common Combination: Process Variable / Calibration Mode
Measurement
Calibration
Saturation
Water
Concentration
Air
If there is a temperature difference between the calibration medium and the
measured medium, the sensor must be kept in the respective medium for sev-
eral minutes before and after calibration in order to deliver stable measured
values. The type of calibration pressure detection is preset during parameter
setting.