horiba U-51, Инструкция по эксплуатации

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4 Maintenance
86
4.3 Every 2 months maintenance

Dissolved oxygen (DO) sensor
Note

The DO sensor's internal solution is potassium chloride (KCl). Although KCl is harmless,
protective equipment such as gloves and goggles should be worn when working with it.

Internal solution can be disposed of down a sink.

Use #306 as the internal solution.

Replace the membrane cap.

Polish the gold and silver electrodes when replacing the membrane cap.
The gold electrode does not need to be polished if it is not dirty.

Silver electrode
Polish a silver electrode part with sandpaper (#600) and then wash metal electrode parts with
water.

Gold electrode
Polish a gold electrode part with green polishing sheet (#8000) by the lusterless side. Add
water on the green polishing sheet before polishing. And then wash metal electrode parts with
water. Do not use sandpaper on the gold electrode.
Replace a membrane cap after clean metal electrodes parts.
Refer to “ 4.6 Replacing the membrane cap ” (page 89).

Reference electrode
Note

The pH reference internal solution is potassium chloride (KCl). Although KCl is harmless,
protective equipment such as gloves and goggles should be worn when working with it.

Internal solution can be disposed of down a sink.

Use #330 as the internal solution.
1.
Remove the rubber liquid junction plug from the reference electrode and dispose of
the internal solution.
2. To prevent air entering, fill the reference electrode to the brim with its internal
solution (#330).
3.
Put the rubber liquid junction plug back in place.
If the rubber liquid junction plug is dirty, replace the liquid junctions (set of two; No.
3200043587). The reference electrode's internal solution will spill when replacing the
liquid junctions. Rinse parts with tap water and dry them with a soft cloth.
Silver electrode
Gold electrode