19 Calibrating O-DO sensors
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19.2.1 Calibration methods for O-DO sensors
End value calibration
With end value calibration, the slope of the sensor is calibrated beyond the de-
fined state of 100 % oxygen saturation. This state can in principle be achieved
in two ways:
• By positioning the sensor in water vapor-saturated air (for example, directly
over a water surface).
• By positioning the sensor in air-saturated water (air is directed through water
until the water is saturated with it).
Two-point Calibration
With two-point calibration, the zero point and slope of the sensor are calibrated.
This calibration method offers the greatest possible level of accuracy and is par-
ticularly recommended for measurements of small oxygen concentrations.
19.2.2 Calibration default settings for O-DO sensors
Before you can perform a calibration, you must first enter the necessary calibra-
tion default settings. The possible settings for the O-DO calibration are de-
scribed in the following.
Open the calibration default settings:
Device Menu > Calibration > Digital Sensor 1 to 6 >
Calibration Default Settings
NOTE!
The "Calibration default settings" menu appears in the Device menu only if a
user with corresponding user rights is logged in. Calibration default settings of a
digital sensor only appear for linked digital sensors.
⇨ Chapter 8.2.1 "Log-on/Log-out", page 89
⇨ Chapter 8.2.7 "Digital sensors", page 95
Sample screen:
O-DO calibration default
settings
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