Instructions pH FUN V1
Page 19 of 28
5
Performing a manual dosing
Danger warning:
The dose amount or length of time of a manual dosing must be selected with care and expert
knowledge. An overdosing, which in the extreme case can lead to a health hazard, could be the
result.
The setting of a suitable dose amount or length of time is the sole responsibility of the operator.
To ascertain the appropriate manual dose amount, please see 5.1 Calculating the manual dosing.
In certain situations, e.g. after a new filling of the pool, it can make sense to specifically dose a larger amount of pH-
Minus (or pH-Plus) into the pool water. The manual dosing mechanism exists for this purpose. During a manual dosing,
the dosing pump runs for a limited time with full dosing rate (100%). The dose amount of a manual dosing and the
resulting time duration can be set in the menu (0.1…4.0 litre, see Chapter 4.3.3 Setting options in the menu setting
options in the menu).
You can start a manual dosing from the normal view by switching the operating mode of the pH FUN to Man.-
(or Man.+). The duration in time of the manual dosing is then counted down (in minutes) in the display:
7.40 pH
67min_ D-100%
After completion of the manual dosing, the pH FUN automatically jumps back to the previously valid operating mode
"Auto" or "Off".
You can abort a running manual dosing at any time by resetting the operating mode to "Auto" or "Off".
5.1
Calculating the manual dosing
The following approximation formula can be used to calculate the appropriate pH-Minus dose amount:
pH-Minus dose amount = Desired lowering of the pH value x Pool volume in m³ x 0.1 litres
Example:
In a 40m³ pool, the pH value shall be reduced from 7.6 pH to 7.2 pH.
The desired lowering of the pH value thus amounts to 0.4
The pH-Minus dose amount calculates to 0.4 x 40 x 0.1 litres = 1.6 litres.
The dosing pump of the pH FUN has a dosing rate of approx. 0.9 litres/h. Thus, the time duration for the dosing of a
specified dosing amount is calculated as follows:
Dosing duration in min = Dose amount in litre x 60 / 0.9
For the dose amount of 1.6 litres from the above example, this thus results in a dosing duration of just under
107 minutes.
5.2
Safety functions for a manual dosing
With a manual dosing as well, there are various safety functions active:
•
The pH FUN will block the manual dosing for a missing flow signal (no flow through the measurement cell)
•
The manual dosing is blocked by a level alarm (canister empty)
•
A manual dosing in pH-reducing direction is limited by the lower alarm limit
•
A manual dosing in pH-increasing direction is limited by the upper alarm limit
In contrast, the dosing alarm is not active with a manual dosing. For a precise description of the alarm and safety
functions of the pH FUN, see Chapter 8 Alarms and safety functions.