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19 Calibrating O-DO sensors
19.1 Important information
19.2 General information
Depending on the calibration method, O-DO sensors are calibrated on the basis
of measurements in water and water sulfite solutions (sulfite
concentration < 2 %).
Positioning the sensor in the water vapor-saturated air
To achieve successful calibration, the following points must be taken into ac-
count:
• The sensor must be kept dry during the calibration process. Drops of water
adhering to the sensor membrane could distort the measurement result.
• The air pressure and temperature must remain constant during the calibra-
tion.
WARNING!
During the calibration, the relays and analog output signals assume the config-
ured states! The response of the output signals is set for each output in its "Re-
sponse at calibration" configuration point.
⇨ Chapter 10.5 "Analog inputs", page 139
NOTE!
As the manufacturing of air-saturated water requires a high level of effort and is
difficult to reproduce, the easier process of calibration in water vapor-saturated
air is recommended for the operational calibration.
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