Kobold APK-Z, Operating Instructions Manual, Page: 8 / 12

APS-Z/APK-Z/ARS-Z
page 8 APS-Z/APK-Z/ARS-Z K04/1122
7. Cleaning
The membrane glass must never be exposed to aggressive or abrasive cleaning
agents (scouring milk, etc.)!
Cleaning the membrane glass must not result in any scratches!

Impurities that have accumulated on the surface of the membrane glass and
diaphragm must be removed!

The electrode must be adequately washed off after every cleaning!

If careful dabbing with a soft moist cleaning tissue proves unsuccessful,
various chemical cleaning methods can be used depending on the type of
impurity:
Type of accumulation Cleaning agent
Lime and metal hydroxide Diluted hydrochloric acid (1-3%)
coatings
Greases and oils
Organic solutions (for example ethanol) or
a solution containing a surfactant
(dishwashing detergent, etc.)
Protein Pepsin in diluted hydrochloric acid
Accumulation Cleaning mixture consisting of
containing sulfides hydrochloric acid and thiourea
Inorganic coatings Hydrochloric acid (0.1 mol/l) or caustic
soda (0.1 mol/l)