iQntrol DOS-MODBUS
Original manual in German Version 1.0.2 2022.10.06
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10
Maintenance and cleaning
All required maintenance and repair tasks may only be done by properly qualified personnel. Required spare parts are
available from your specialist dealer.
Please observe the safety notices when handling chemicals and wear appropriate protective clothing.
The following maintenance tasks must be carried out.
-
Clean the fine filter in case of obvious contamination
-
Calibrate the pH electrode in case of a deviation >0.2 pH compared to the phenol red measurement or a successive
increase of the free chlorine in the basin water (due to an increasing pH value)
-
Replace the dosing valves’ valve hoses in each season
-
Replace the dosing cartridges in each season
-
Replace the redox electrode in each season
-
Replace the flow control valve's maintenance set about every two to three years
10.1
Fine filter
The fine filter prevents the contamination of the measuring cell. It must be inspected at regular intervals and cleaned as needed.
Especially in the spring and fall, a higher level of contamination due to flying seeds and falling leaves can occur in outdoor pools.
During these times, shorter cleaning intervals must be applied.
Notice
A contaminated fine filter may lead to a chlorine depletion. This leads to reduced redox voltage and subsequently to
an increase in the pool’s chlorine content.
10.2
pH electrode
ATTENTION!
During all work on the pH electrode, it must be ensured that neither the electrode's screw plug head nor the plug of
the electrode cable are exposed to moisture! Even the smallest amount of moisture in the electrode head may lead
to a distortion of the measuring value or even to a premature failure of the electrode!
All contacts in the electrode's plug head and on the electrode plug must display a shiny golden colour and may not
show any signs of corrosion.
Each pH electrode is a wear part. It is subject to a certain degree of ageing, which is due to a variety of factors. In the area of
swimming pool water treatment, the electrode should be functional for approximately 6 months to 2 years.
The contamination of the diaphragm may be another reason for measuring value deviations. These contaminations can usually be
removed by means of the included diaphragm cleaner. For this purpose, the glass shaft of the pH electrode is submerged in the
cleaning solution for a few minutes.
Depending on the state and age of the electrode, the electrode's characteristics may change. This leads to measuring value
deviations, which can be offset by a calibration.
Notice
After each cleaning or exchange of the electrode, a calibration must be carried out! Do not touch the glass top
(sensor part) and the diaphragm with your fingers or with cleaning materials.
10.3
Dosing valves
The disinfection dosing valve is subject to encrustation when chlorine-containing disinfectants are being used. The level of
encrustation depends on the dosed volume, the temperature at the dosing point, the chlorine solution's components and the
water hardness. The maintenance intervals are several weeks to multiple months. The encrustation in the valve body (part 2) can
be removed with a lime-dissolving acid. As part of the annual maintenance, the rubber gaskets of both dosing valves must be
replaced.
10.4
Flow control valve
The diaphragm in the flow control valve hardens over time. This results in a reduced control behaviour of the flow. For this
reason, the diaphragm should be replaced every two to three years.
Notice
When replacing the diaphragm, please note its installation position. The blue spring must press down on the larger
spring plate. Otherwise, the function of the flow control valve will be disrupted.