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MW190 Dissolved Oxygen & Temperature Bench Meter
6.3. PROBE MAINTENANCE
The platinum cathode should always be bright and untarnished. If it is tarnished or stained,
the cathode should be cleaned gently with a lint-free cloth.
y
Rinse the probe with deionized or distilled water.
y
Replace the membrane cap using fresh electrolyte. See PROBE PREPARATION procedure.
y
Recalibrate the meter.
Membrane Maintenance
For accurate and stable measurements, perfect condition of the membrane surface is
needed. Protect the thin membrane from scratches, abrasion or contact with solids.
If no measurements are taken for a few hours, protect the membrane with the plastic
protective cap.
If fouled, rinse it carefully with distilled or deionized water. If damaged, replace the
membrane cap.
Note:
Change the membrane every 8 weeks or more frequently if used in a specially
fouling environment. Check and replace the electrolyte fill solution every 4 weeks.
Storage
After taking the measurements, switch the meter off and clean the probe before storage.
When not in use the probe should be stored with the plastic protective cap on.
For short term storage, the probe can also be stored in a beaker of deionized water with
the protective plastic cap removed.
For long term storage, the probe should be stored dry:
1. Disconnect the probe from the meter
2. Unscrew the membrane cap
3. Remove any electrolyte solution from the cap
4. Rinse the probe anode/cathode assembly with distilled water and blot dry
5. Screw the membrane cap onto the probe until the membrane cap is hand tight