YSI MultiLab 4010-1W, Руководство по эксплуатации

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Dissolved oxygen MultiLab 4010-1W
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7.3.6 Zero calibration
With a Zero calibration , the zero point of the sensor is redetermined by cali-
brating in a zero solution.
For most applications, an additional Zero calibration is not required and not
recommended. Only with very rare applications can the accuracy of a calibra-
tion be improved if a
Zero calibration was carried out before.
The zero point calibration is best carried out prior to calibrating with a calibra-
tion procedure (e.g. calibration in water vapor-saturated air or calibration with
comparison measurement).
The
FDO 4410
D.O. sensor ages so little it does not have to be zero
point calibrated.
A zero point calibration is not allowed for this sensor.
1. Connect the D.O. sensor to the meter.
2. 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.
3. In the menu for measurement and calibration settings (
<ENTER>
/ Cal-
ibration / Zero calibration ), start the Zero calibration .
The calibration point for the measured value 0 (DO Zero) is displayed.
4. Start the measurement with
<ENTER>
.
The measured value is checked for stability (stability control).
The [AR] status indicator is displayed. The measured parameter flashes.
5. Wait for the AutoRead measurement to be finished (beep, [HOLD][AR]
status indicator).
The current value is set to zero.
The calibration record is displayed.
O
2
0.9
%
Cal
03.04.2013
08:00
25.1°C
DO Zero