Note:
The oxygen probe must be checked periodically (depending on the proportion of
impurities present). It is important to rinse the probe and pellet before each check.
Organic deposits on the active pellet, such as mud or biofilm, may result in measurement
errors. These deposits can be removed by carefully using hot soapy water and a sponge.
Never use an abrasive cleaner.
7.1.8 Calibration of zero point – detailed procedure
The sodium sulfite solution must be ready for calibration.
1. Remove the probe from the original liquid medium, rinse it and check for any deposit of
dirt/contamination as described, where applicable.
2. Immerse the probe in a container filled with sodium sulfite solution.
3. Keep stirring slowly to ensure local gas exchange at the OPTOD’s active membrane.
4. Wait until the value is stabilized.
5. Use the or arrow key to select the CALIBR 0.0% line.
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