5
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5.9
Electrode Information
The electrodes must be replaced annually or earlier if worn. Use original replacement electrodes only. They can be obtained from your
swimming pool dealer.
Electrode Wear
The following conditions, among others, indicate that the electrodes are worn:
During calibration, the electrode takes unusually long to reach the value of the buffer solution.
The electrode offset during calibration is too large.
The KCL solution in the electrode shaft is used up or discoloured.
ATTENTION
Electrodes wear very rapidly if there is an electric potential in the pool water!
Electrode Care
The pH-sensitive membrane glass must be handled with care and protected against damage.
The inner reference solution in the glass electrode must cover the inner surface of
the membrane glass. Any air bubbles are removed by gently shaking the electrode vertically (like shaking a medical thermometer).
Contamination deposited on the surface of the membrane glass must be removed by carefully wiping it with a moist paper towel.
Alternatively, you can use the supplied electrode cleaning solution.
Calibrating Electrodes
Notes on calibrating electrodes can be found in the corresponding chapters and in the calibration examples.
5.10
Decommissioning / Winter Storage of the System
If the system is put out of operation for lengthy periods, e.g. for winter storage, certain precautionary measures need to be taken. In
particular, it is very important that the entire system is protected against freezing temperatures and humidity.
Dosing System
Rinse the pump with fresh, lukewarm water for about 30 minutes. To do so, place the suction lance into a pail filled with tap water
and start a manual dosing.
Ensure that the system is fully disconnected from the power grid.
Release the hose set to prevent permanent deformation.
Measuring System
Store the electrodes in an upright position in the containers in a location where temperatures will not drop below zero. The three
molar KCL solution in the containers protects the electrodes from drying out.
Close both electrode drill holes of the measurement cell with the supplied cover screws.
Let the water drain from the measurement chamber and measurement lines.