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Multi 9420 Dissolved oxygen (D.O.)
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7 Dissolved oxygen (D.O.)
7.1 Measuring
7.1.1 Measuring D.O.
Selecting the
displayed
measured parameter
You can switch between the following displays with <M> :
 D.O. concentration [mg/l]
 D.O. saturation [%]
 D.O. partial pressure [mbar].
Salinity correction When measuring the D.O. concentration of solutions with a salt content of more
than 1 g/l , a salinity correction is required. For this, you have to measure and
input the salinity of the measured medium first.
When the salinity correction is switched on, the [Sal] indicator is displayed in
the measuring screen.
1. Connect the IDS D.O. sensor to the meter.
The D.O. measuring screen is displayed.
2. If necessary, select the measured parameter with <M> .
3. Check or calibrate the meter with the sensor.
Only in special cases does the
FDO
®
925 D.O. sensor require cal-
ibration. A regular FDO
®
Check is sufficient.
4. Immerse the D.O. sensor in the test sample.
03.04.2013 08:00 Info
You can switch the salinity correction on or off and enter the salinity
in the menu for calibration and measurement settings (see section
9.4.1 S
ETTINGS FOR
D.O.
MEASUREMENT
, page 92).