User Guide

Instruction Manual DO 100
13
4.3 DO Calibration in mg/L Mode
As mentioned in the beginning of this section, the amount of
oxygen dissolved in a liquid will depend on its temperature,
pressure and salinity. It is therefore very important to set
these parameters correctly before attempting to do a
calibration.
Temperature is measured by the meter automatically.
Therefore it is important to do a Temperature Calibration (as
described in Section 4.1) before attempting DO calibration.
Pressure and salinity values are keyed in manually as
described in Sections 8.2.2 and 8.2.3.
1. From the measurement mode, press MODE key to
select mg/L.
2. Rinse the probe well with deionised rinse water. For
best accuracy, wipe the end of the probe dry. Do not
touch the membrane.
3. Dip the probe into a solution where DO value is known.
4. Wait until the reading stabilises. Press CAL key.
5. Adjust to the required value by pressing MI/ or MR/
key.
6. Press ENTER to confirm the calibration. See Figure
10.
NOTE: To exit from DO Calibration mode without
confirming calibration, press CAL/MEAS key.
Figure 10: DO Calibration