12.5.2 Configuration Wizard
There is a configuration wizard in each of the configuration menus for
pH and chlorine (Cl) and redox (mV). You only need to enter the pool
volume and the dosing pump output [l/h] into the wizard. The wizard
uses that data to calculate sensible basic settings for the control
parameters, especially for the proportional range and the minimum
dosing rate.
A manual adjustment may be entered in order to optimize the
automatic calculation performed by the assistant:
Standard calculation, no correction
Reduction of the standard dosing rate by the indicated %-value
for low use pools with low needs for maintenance products.
Increase of the standard dosing rate by the indicated %-value
for high use pools with high needs for maintenance products.
Manual optimisation of control parameters
The control settings calculated with the help of the
configuration wizard generally deliver good results but
cannot guarantee optimum control quality in every
case.
Under certain circumstances, it may be necessary to
optimise the control parameters manually if problems
arise.
13 Calibration (basic measurement adjustment)
A basic requirement for exact and reliable measurement and control is
regular calibration of the measurement electrodes.
The electrodes convert the measured water parameters into an
electric measurement signal. The correlation between the value in the
pool and the electric measurement signal is not always the same and
may vary from electrode to electrode. Also, it depends on water quality
and other conditions that can change over the course of time.
Calibration calculates the exact correlation between the measured
water parameter and the electric measurement signal. Precise
measurement can only be expected after calibration.
13.1 When is calibration necessary?
Calibration absolutely must be performed in the following situations:
First commissioning or recommissioning
Water change
Electrode replacement
If there are relevant deviations between what the controller
displays and the manual control measurements performed on a
regular basis
After adding other water treatment products or after miscellaneous
changes in water quality
In regular intervals, at least once a month
Overdosing due to
missing or incorrect calibration
Erroneous calibration, or not performing calculation,
can lead to significant measurement errors, which
under certain circumstances may result in heavy
overdosing of pH minus or chlorine.
Potential consequence: Gravest degree of injury,
heavy material damage.
Perform careful calibration in each of the situations
listed above
13.2 Calibration pH
There are various options for calibrating a pH electrode:
1-point calibration with buffer solution pH 7
2-point calibration with buffer solutions pH 7 and pH 9
(or other pairs)
1-point calibration to the pool's pH value
(determined with photometer or colour tester using Phenol Red)
For 1-point calibration, the display value is moved up or down by an
offset. The electrode slope is not recalculated in 1-point calibration. It
remains unchanged.
In 2-point calibration, the electrode slope is recalculated in addition to
the offset.
Calibration pH
Precise calibration can be attained with the following
procedure:
Basic calibration step 1
2-point calibration with buffer solutions pH 7 and
pH 9 in order to calculate the exact electrode slope.
Basic calibration step 2
Subsequent 1-point calibration to the pool's pH value
with a photometer in order to attain the best
concordance possible between the controller's display
and the photometer measurement.
This calibration should be performed as close to the
setpoint as possible, i.e. the pH value in the pool
should be in the ideal range between 7.0 and 7.4
If there is no photometer available, then only step 1
should be performed. A simple colour tester does not
produce reliable calibration with the required precision.
Recalibration
1-point calibration generally suffices for regular
recalibration (at least once a month). If there is a
photometer available, then recalibration should be
performed to the pool's pH value; otherwise with buffer
solution pH 7.
13.2.1 Calibration procedure
pH calibration can be found in the following menu:
Calibration pH
Calibration is carried out as follows:
Select 1-point calibration pH or 2-point calibration pH
Calibration is a menu sequence, i.e. it goes through a series of
menus step-by-step.
13.2.1.1 Calibration Data (1st and 2nd calibration point)
In the input menus for the 1st and 2nd calibration point, the following
parameters are displayed:
Calibration value
For the calibration value, enter the reference value to which calibration
should be performed.
When calibrating with a buffer solution, this will be the known pH value
of the buffer solution, such as pH 7 or pH 9.
When calibrating to the pool water's pH value, this will be the value
measured with a photometer (a simple colour tester is not suitable for
calibration as the measurement precision is not sufficient).
Current Value
This is the current measured value calculated using the parameters
from the last calibration, which are still valid. This value may deviate
from the actual value. It is only displayed to give you a certain level of
orientation throughout calibration.
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