Maintenance; Maintenance In General; Intervals; Redox Electrodes - Xylem mjk pHix Compact Manual

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Maintenance

A pH or redox measuring system requires maintenance with regular intervals.

Cleaning and buffer adjustment (calibration) is a normal and necessary

maintenance that should be carried out regularly.

The interval between buffer adjustments and cleaning depends widely on the

working conditions. Therefore, the easiest way to find the most appropriate

cleaning interval is by feeling one's way.

For instance, start out by cleaning and buffer adjusting every week.

If measurements are unchanged or just slightly changed after buffer

adjustment, the electrode were not dirty or just slightly dirty, and the cleaning

interval can be changed to two weeks and after that, one month.

The intervals are equally reduced if the electrodes are very dirty and the

measurements are significantly changed after buffer adjustment.

There are no general guidelines to cleaning and adjustment, but in most cases,

a monthly adjustment is sufficient. Before beginning a buffer adjustment, the

electrode must be thoroughly washed:

first in running water

then, if necessary, in a degreasing fluid, like, for example a 10%

hydrochloric acid solution

then, before the electrode is put into the buffer solution, and again in

between every step of the buffer adjustment, rinse with water and dry

with a dry cloth.

Like pH electrodes, Redox electrodes require cleaning but not buffer

adjustment. However, MJK does deliver redox buffers for control of electrode

and transmitter.

If the transmitter does not show the correct value when put into the buffer

solution, the electrode must be exchanged.

Maintenance / Maintenance in general

pHix® Compact

EN 4.10 Version 2007

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