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Instructions pH FUN V1
Page 21 of 28
7
Measurement and control of the pH value
The pH FUN continuously measures the current pH value in the pool water and constantly adjusts it by automatic
addition of pH-Minus (or pH-Plus) to the setpoint specified in the menu. The recommended pH value for swimming
pool water lies in the range 7.0..7.4 pH.
The pH FUN continually calculates the optimal dose amount or dosing rate in the respective situation.
7.1
Dosing rate and dosing cycle
The pH-Minus (or pH-Plus) dosing occurs within a fixed cycle of 60 seconds length. Within this 60 second dose cycle,
the dosing pump is switched on and off again depending on the dosing rate. The dosing rate is specified in % and
states how long the dosing pump is switched on based on the 60 second dosing cycle:
Dosing rate
Dosing cycle
Switched-on time
of the dosing pump
Switched-off time
of the dosing pump
0%
0s
60s
5%
3s
57s
10%
6s
54s
25%
15s
45s
50%
30s
30s
75%
45s
15s
90%
54s
6s
100%
fixed 60s
60s
0s
7.2
Calculating the dosing rate
The optimal dosing rate for the respective situation is continually recalculated by the pH FUN depending on the current
pH value of the pool water, the desired setpoint and additional parameters.
The following factors come into play when calculating the dosing rate:
Parameter
Explanation
Current pH value in the
pool water
Desired
pH setpoint
The stronger the currently measured pH value of the pool water deviates from the set
setpoint value, the higher the dosing rate will be i.e. the m ore pH-Minus (or pH-Plus) is dosed
into the pool water.
Since the dosing rate increases proportionally to the deviation between the current pH
measured value and the pH setpoint, we call this a proportional regulation.
Pool volume
The calculated dosing rate is proportionally adapted to the entered pool volume. With larger
pools, the dosing rate is increased, with smaller pools, the dosing rate is reduced.
Dose amount
low / normal / high
Using this setting, the dose amount / dosing ra te can be increased or reduced as needed. In
the most cases, the standard setting of "normal" ensures a correct regulation of the pH
value.
In the "low" setting, the pH FUN reduces the dose amount / dosing rate compared to the
"normal" setting by 30% usually.
In the "high" setting, the pH FUN increases the dose amount / dosing rate compared to the
"normal" setting by 50% usually.
Min.dos.rate
(minimum dosing rate)
To ensure a reliable achievement of the setpoint, the pH FUN works with a minimum dosing
rate (standard setting 5%), that is never fallen below provided the setpoint is not yet reached.
The minimum dosing rate ensures that even when approaching the setpoint that sufficient
pH-Minus (or pH-Plus) is dosed.