Horiba Scientific LAQUAact D-75G, Instruction Manual

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Dissolved oxygen measurement
41
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Performing measurement
You can perform measurement in the measurement mode by immersing the DO
electrode in the sample. Also, you can use the automatic hold function to perform
stability judgment of the measured value.
1. Press the key to change the parameter to measure.
2. Wash the membrane at the tip of the DO
electrode with pure water (or deionized water)
and wipe it with a soft cloth at least 10 minutes
before calibration.
Be careful not to break the membrane at the tip of
the electrode.
3. Immerse at least 6 cm from the tip of the DO
electrode in the sample solution.
In order to immerse the temperature sensor
equipped with the electrode in the sample
solution, immerse it at least 6 cm of the sample
solution.
During measurement, use a stirrer to stir the sam-
ple solution at 1000 rpm to 1500 rpm.
Note
When using an electrode "9551-20D" or "9551-100D", immerse at least 9 cm from the tip.
4. While the DO electrode is immersed in the sample solution, press the key.
Stabilization judgment starts and the HOLD icon blinks. When the value is stabilized,
the HOLD icon changes from the blinking state to the lit state and the display is fixed
to the measured value at the stable time. Pressing the
key again releases fixing
the measured value.
key
Stabilized