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18.1
Important information
18.2
General information
Positioning the sensor in the water vapor-saturated air
WARNING!
During the calibration, the relays and analog output signals assume the states
configured for the calibration! The response of the output signals is set for each
output in its "Response at calibration" configuration point.
⇨
Chapter 10.7 "Analog outputs of base unit and optional boards", page 28
Depending on the calibration method, O-DO sensors are calibrated on the basis
of measurements in water and water sulfite solutions (sulfite
concentration < 2 %).
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.
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.
18 Calibrating O-DO sensors
99
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