Electrode Care; Cleaning The Electrodes; Calibration; Hoses Of The Dosing Pump - Aquacontrol Basic Exact pH/Rx Bedienungsanleitung

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5.2.2 Electrode care

•

The pH-sensitive membrane glass must be handled with care and protected from

damage.

•

The inner reference solution of the glass electrode must cover the inner surface of

the membrane glass. Visually check the probes for trapped air bubbles. If air

bubbles are present, these can be removed by shaking downwards (like a

thermometer).

If contamination on the glass membrane cannot be removed using a soft, damp cloth,

the following cleaning agents may be used.

General deposits: Non-abrasive household cleaners

Lime or metal hydroxides: Diluted hydrochloric acid (approx. 0.1%-3%) / 1-5 min

Oils and greases: Solvents, such as alcohol and acetone

Biologic coatings: Solution of diluted hydrochloric acid and pepsin. Leave to work for

a couple of hours; solvents (e.g. acetone) may not be used to clean electrodes with

plastic shafts since it can corrode them.

Always rinse sufficiently after each cleaning process.

If the ceramic diaphragm of the reference system that is installed on the side is blocked,

this can be cleaned in the same way as the glass membrane. You can also carefully

scrape it with a fingernail, razor blade or fine file. Make sure that the glass membrane

is not scratched.

pH probe

Calibration is carried out as described in the operating instructions (the device section).

If the deviation is too great or fails, the electrode must be replaced.

Rx probe*

The Rx probe is checked using the buffer solution Rx 475 mV. If the deviation of the

measured value is too large (40 mV), the electrode must be replaced. Attention: Rx

probes are end-calibrated at the factory.

5.3

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