6 Redox option
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6
Redox option
Using the redox option ensures that the chlorine production cell of the Salt Relax POWER is only activated when disinfection agent is actually
required.
NOTE!
Different pools may have very different redox values although the chlorine value is the same. For example, a chlorine value of 0.8 mg/l
may result in a redox value of 710 mV in one pool, but a redox value of 790 mV in another, similar pool. Significant variations are
possible!
For this reason, do not rely on past experience, but measure the precise redox value for each individual pool.
The further chemical composition of the pool water also influences the redox value. For example, adding other water care products may
change the redox value although the chlorine value remains stable.
The measured redox value at the desired chlorine level is set on the Salt Relax POWER as a setpoint. The Salt Relax POWER maintains the redox
value at the set level, thus ensuring reliable disinfection.
6.1
Scope of delivery, redox option
1 Electrode holder
2 Buffer solution 465mV
3 Electrode cleaner
4 Redox module
5 Redox electrode
6.2
Installing the Redox module
Installation of the redox module is described in detail in the chapter "Installing the pH and redox pH module." Please note that installation must be
performed by a specialist service technician/installation engineer.
6.3
Installing the redox electrode
Install the redox electrode in the holder provided (see installation diagram) using the clamp mounting supplied. Insert the electrode into the screw
fitting until its tip is approximately in the centre of the pipe cross-section. Ensure that the screw fitting seals tightly. Connect the electrode to the socket
provided on the Salt Relax POWER.
6.4
Redox setpoint
For redox regulation, it is not the calibration of the electrodes which plays a major role, but the correct definition of the redox setpoint.
As long as there is no major change in the water quality and other ancillary conditions, the measured redox value depends directly on the
concentration of free chlorine. The chlorine production cell is switched on as soon as the set redox value falls below the limit.
6.4.1
Determining the redox setpoint
Proceed as follows to determine the right redox setpoint for your pool water:
1.
Check that the pH value is 7.2 and that the pool water already has the desired amount of salt.
2.
Switch the filter unit on and bring the pool water to the desired chlorine value. Ideally, add the required amount of chlorine manually in several
steps and check the value repeatedly with pH control measurements.
At the same time, set the desired value for the chlorine stabiliser (isocyanuric acid). In the case of pools with strong exposure to sunlight, 30g
of isocyanuric acid per m
3
is recommended.
3.
Once you have the desired chlorine value in the pool and have checked it with a pH control measurement, observe the redox value displayed
on the Salt Relax POWER. It will rise due to the addition of chlorine.
4.
Wait for the display value (see main screen) to stabilise. It should then remain roughly the same over a period of approx. 30 minutes.
5.
Under the current water conditions, the redox value displayed on the main screen corresponds to the chlorine value previously set. Now set
this displayed redox value as the setpoint for redox regulation (see "Setting the redox setpoint on the device").
6.
It is essential that you check the chlorine value in the pool via pH control measurement and the displayed redox value on the following day. If
necessary, increase or reduce the set value.