Sensor Calibration - BWT PRO A Notice D'installation Et Conseils D'utilisation

below the set point. The default set point is 7.2. The ideal pH for a pool fitted with a BWT Chlorine
generator is between 7.2 and 7.4.
For safety reasons, the pump injecting the acid cannot run for more than 60 minutes continuously, to avoid
excessive acidification of the water. If this time period is reached, check that the sensor is not faulty, and
that acid is being correctly injected into the pool 's hydraulic circuit. Failure to inject acid could be due
to: the pH reducer tank is (almost) empty, the end of the suction tube is above the level of the liquid, the
suction and/or injection tube is blocked or pierced, the end of the injection tube has come out of its housing.
Redox regulation: The Redox potential is a measure of thee electrical potential of the water, this
value is proportional to the concentration of free Chlorine in the water. The Redox potential set
point is the minimum value desired.
To determine the optimal Redox value, proceed as follows:
1.
Switch the pool filtration system on, and set it to 'circulation' mode (by pass the filter).
2.
After one hour, measure the water balance parameters (see paragraph 4), and adjust these if necessary
using the appropriate chemicals.
3.
Allow chemicals to dissolve completely, then mix the water for at least one hour.
4.
With filtration still running, measure the concentration of free Chlorine in the water (calibrated
photometer), and, if necessary, add non-stabilised liquid Chlorine by pouring it in slowly in front of
the return fittings until a value of between 1.2 and 1.4 ppm in the case of PRO A models or between
0.6 and 0.8 ppm of free Chlorine is achieved. Add the liquid Chlorine in successive small amounts,
allowing time for mixing between additions to avoid overshooting the desired concentration.
5.
Read the value displayed on the Redox screen and save this value as the Redox set point.
6.
The next day, check the concentration of free Chlorine (DPD1 test kit) and the Redox value. If
necessary; raise/ lower the set point.
Do not forget to check the Redox set point every 2 to 3 months and/ or every time that you modify the water
management parameters, notably the pH set point and the heating temperature.
As long as the value measured by the Redox sensor is greater than or equal to the set point value, the
device will not produce Chlorine. As soon as this value drops below the set point, the device will produce
Chlorine and will stop once the value rises above the set point. The default Redox set point is 700 mV.
7.3.2 Sensor calibration
Proper control off the pH and Redox values with respect to the set points depends on the precision of the
sensors. The sensors should be calibrated at regular intervals.
We recommend that the sensors be calibrated at the beginning of the pool season, then once a
month throughout the season.
Calibrating the pH sensor using buffer solutions:
Submerge the sensor successively in two liquids with known pH values (buffer solutions) and check that
the sensor displays the correct value. The pH kit includes a sensor rinsing solution ("neutral buffer"), a pH7
buffer solution and a pH10 buffer solution.
Follow the steps displayed on screen:
For each of the buffer solutions, adjust the target value to the buffer value and press OK to calibrate the
sensor.
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2021/03 - Indice de révision : B Code : 29740 TRAITEMENT DE L'EAU