Xylem MultiLab 4010-2 - Manual (Page 49)

MultiLab 4010-2 Dissolved oxygen (D.O.)
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 Calibration in water vapor-saturated air.
 Calibration via a comparison measurement (e.g. Winkler titration according
to DIN EN 25813 or ISO 5813). At the same time, the relative slope is
adapted to the comparison measurement by a correction factor. When the
correction factor is active, the [Factor] indicator appears in the measuring
window.
Calibration can be carried out either as a 1-point calibration or 2-point calibra-
tion procedure.
7.2.4 1-point calibration
Calibration in water vapor-saturated air (Cal) and calibration via Comparison
meas. according to the Winkler method (Comp) are described jointly here.
1. Connect the D.O. sensor to the meter.
2. Check the selected calibration type and selected number of calibration
points in the sensor setting menu and, if necessary, change them.
3. Put the IDS D.O. sensor into the calibration medium.

When calibrating via comparison measurement (Comp):
Put the IDS D.O. sensor into the reference solution.
 When calibrating in water vapor-saturated air (Cal):
Put the IDS D.O. sensor into the calibration vessel with water vapor-
saturated air.
As the calibration vessel use a BOD bottle that contains a
small amount of clean water (approx. 40 ml).
The sensor must not be immersed in the water.
Leave the sensor in the calibration bottle long enough (5 to
10 minutes) so that the air is water vapor-saturated and the
sensor can adapt to the ambient temperature.
4. Start the calibration with .
Cal (calibration in water vapor-saturated air) or Comp (calibration via
Comparison meas. according to the Winkler method) is displayed.
The calibration point (DO Sat) is displayed.