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11
Measurement, control, dosage
(pH value, redox value, chlorine/bromine)
INFO
Pool volume and dosing rate
The default values indicated for minimum dosing rate
are oriented toward the following general conditions:
Assuming a pool volume ca. 40m³
•
dosing output on pumps ca. 1.5 l/h
•
For larger pool volumes in relation to pump dosing rate,
the minimum dosing output generally has to be
increased.
For larger pool volumes in relation to pump dosing rate,
the minimum dosing output generally has to be
increased.
INFO
Influence on the control system
The minimum dosing rate should be increased in the
following cases:
When the setpoint is not entirely attained, or
•
attained only very slowly
The minimum dosing output should be decreased
•
in the following cases:
When the control system exceeds the setpoint, i.e.
•
overdosage
11.4.6
Intelligent dosing monitoring
If the current measured value deviates from the desired setpoint, then
®
PoolManager
will dose maintenance product into the pool water in
order to offset the deviation. In this case, it should be expected that
the measured value approaches the setpoint.
®
PoolManager
checks in the indicated intervals whether the setpoint is
actually approached as expected. Additionally, PoolManager
assesses various criteria calculated based on a large number of
circumstances. If the setpoint matching criteria are met, then the
dosing output will be continued.
If those criteria are not met, then PoolManager
alarm and block continued dosage. In this case, there is presumably
either a problem or the current settings are not appropriate for the
pool. In the event of a dosage alarm, the entire system should be
inspected for potential problems.
The dosage alarm and the dosage block are ended by pressing the
corresponding button to acknowledged the dosage alarm in the alarm
overview.
You can set the interval for dosage monitoring in [min] in the menu. At
the end of each interval, a test is executed on whether the setpoint is
being approached according to the criteria.
INFO
Configuring dosing monitoring
For most applications, the standard setting for the
dosing monitoring interval should deliver good results.
You should only increase the preconfigured interval if
dosage alarms are repeatedly reported unfoundedly. In
general, this will only happen if the pool is reacting
extremely slowly or if there are very high downtimes, or
if there is some other miscellaneous problem.
In this case, the entire installation should be checked,
especially circulation.
®
®
will report a dosage
User Manual PoolManager
11.4.7
Dead zone
An activated dead zone ensures that dosage is not started for
minimum deviations from the setpoint, but rather only after the current
measured value departs from the dead zone. The dead zone is quasi
a tolerance range around the setpoint.
The following figure shows how the control system performs in the
dead zone using pH control as an example.
1
dosing output in %
2
Measured pH value
3
Configured setpoint pH 7.20
4
Minimum dosing output (5%)
5
Dead zone (0.05pH
pH 7.20...7.25)
6
Dosage does not begin until the measured value departs from
the dead zone
7
When approaching the setpoint, dosage will not stop when
entering the dead zone but rather upon reaching the setpoint.
INFO
Dead zone application
The standard setting for the dead zone is 0, i.e. the
dead zone is not active.
It is particularly recommended to activate the dead
zone for bi-directional pH control in order to avoid
constant triggering of the pH minus and pH plus
dosage pumps.
11.4.8
Dosing cycle
The dosing cycle is a defined, fixed time interval in which the dosage
pumps are turned on and off depending on the current dosing output.
The sum of switch-on duration and switch-off duration is always
constant and corresponds to the dosing cycle.
A graphic presentation of the dosage cycle can be found in the section
dosing output above.
INFO
Notes on configuring the dosing cycle
For most applications, the standard setting for the
dosing cycle should deliver good results.
For very small pools, such as whirlpools, a shorter
dosing cycle may deliver better results under certain
circumstances as the control system can react to
changes more quickly.
®
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