YSI MultiLab 4010-2 - Manual (Page 73)

MultiLab 4010-2 Dissolved oxygen (D.O.)
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8.2.5 2-point calibration
Calibration in water vapor-saturated air (Cal) and calibration via Comparison
meas. according to the Winkler method (Comp) are described jointly here.
7. Switch to the measured value display with <ENTER>.
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. Place the D.O. sensor in a solution that does not contain any dissolved
oxygen.
A solution not containing any dissolved oxygen can be prepared by
dissolving approx. 8 to 10 g sodium sulfite (Na
2
SO
3
) in 500 ml tap-
water. Carefully mix the solution. It may take up to 60 minutes until
the solution is free of oxygen.
4. Start the calibration with <CAL>.
Cal (calibration in water vapor-saturated air) or Comp (calibration via
Comparison meas. according to the Winkler method) is displayed.
The calibration point 1 (0%) is displayed.
5. Start the measurement with <ENTER>.
The measured value is checked for stability (stability control).
The [AR] status indicator is displayed. The measured parameter flashes.
6. Wait for the AutoRead measurement to be completed (audio signal).
The display for the second calibration point is displayed.
7. 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.