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18 Calibrating O-DO sensors
18.2.1
Calibration methods for O-DO sensors
End value calibration
Two-point Calibration
18.2.2
Calibration default settings for O-DO sensors
100
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).
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.
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. The "Calibration default set-
tings" menu for a digital sensor is visible for the digital sensor concerned only
when it is linked.
⇨
Chapter 8.2.1 "Log-on/Log-out", page 91
⇨
Chapter 8.2.7 "Digital sensors", page 97
Sample screen:
O-DO
calibration default settings
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