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12
Calibration (basic measurement comparison)
Calibration (basic measurement comparison)
Using the measured value, you can see whether measurement is
Using the measured value, you can see whether measurement is
sufficiently stable for reliable calibration.
12.3.1.2 Calibration results
At the end of calibration, the calibration parameters generated are
At the end of calibration, the calibration parameters generated are
displayed:
Offset Chlorine
Offset is the zero point displacement calculated from calibration. It is
Offset is the zero point displacement calculated from calibration. It is
indicated in [mg/l].
Current Value Chlorine
The chlorine/bromine measured value is then calculated using the
sured value is then calculated using the
parameters from the current calibration. The measured value
parameters from the current calibration. The measured value
displayed should therefore coincide with the calibration value entered.
displayed should therefore coincide with the calibration value entered.
12.3.1.3 Step by step
Calibration to the measured DPD value
26.
Take a water sample from the measurement chamber and
calculate the chlorine/bromine value using a photometer
calculate the chlorine/bromine value using a photometer
(DPD1 method).
27.
In the menu, select the function Calibration Cl
28.
Enter the pool water's DPD value calculated as the Cal. Value
Enter the pool water's DPD value calculated as the
Cl (DPD 1 value)
29.
If the measured value displayed and the measurement are
stable and are no longer changing in a relevant manner, then
stable and are no longer changing in a relevant manner, then
confirm calibration by pressing Next.
30.
Check the calibration results displayed and close calibration by
Check the calibration results displayed and close calibration by
pressing Ready.
12.3.2
Calibration errors
During calibration, various plausibility criteria are checked. If one of the
plausibility criteria are checked. If one of the
criteria is not met, then a corresponding error message appears and
criteria is not met, then a corresponding error message appears and
calibration is not executed.
The following criteria have to be met for successful calibration:
The following criteria have to be met for successful calibration:
Calibration must be performed for a calibration value
Calibration must be performed for a calibrat
•
(DPD values) of at least 0.20 mg/l.
The offset calculated (zero point displacement) has to be in the
The offset calculated (zero point displacement) has to be in the
•
range of ±1.00 mg/l. The offset is generally close to 0 for flawless
range of ±1.00 mg/l. The offset is generally close to 0 for flawless
electrodes.
The slope calculated has to be in the range of 1 A/mg/l
The slope calculated has to be in the range of 1 A/mg/l –
•
250 A/mg/l. For flawless electrodes, slope is generally in the
/mg/l. For flawless electrodes, slope is generally in the
range of 5 A/mg/l and 20 A/mg/l.
surement chamber and
Calibration Cl
he measurement are
User Manual PoolManager
12.4
Calibration redox (mV)
Calibration redox (mV)
The calibration for redox measurement is performed as 1
The calibration for redox measurement is performed as 1-point
calibration. A buffer solution with a known redox value (e.g. 465 mV) is
calibration. A buffer solution with a known redox value (e.g. 465 mV) is
used.
TIP
Redox calibration
Redox calibration
Depending on water quality and the state of the
Depending on water quality and the state of the
electrode, it can occur that the redox electrode reacts
electrode, it can occur that the redox electrode reacts
very slowly if it is moved from the buffer solution back
very slowly if it is moved from the buffer solution back
into the measurement water after calibration. In
into the measurement water after calibration. In
disadvantageous conditions, it may take several hours
disadvantageous condi
until the measured redox value stablises again and is
until the measured redox value stablises again and is
displayed correctly.
displayed correctly.
During that time, reasonable configuration and launch
During that time, reasonable configuration and launch
of redox control is not possible.
of redox control is not possible.
Therefore, it is recommended to only perform redox
Therefore, it is recommended to only perform redox
calibration when necessary, such as when it is
on when necessary, such as when it is
suspected that the electrode could be defect.
suspected that the electrode could be defect.
In general, calibration can be omitted for the following
In general, calibration can be omitted for the following
reasons in order to avoid potential problems with the
reasons in order to avoid potential problems with the
time it takes to function properly again:
time it takes to function properly again:
Functioning redox electrodes generally have a tight
Functioning redox e
tolerance range, such that calibration only changes the
tolerance range, such that calibration only changes the
display value by a few mV.
display value by a few mV.
The absolute redox value is not of significant important.
The absolute redox value is not of significant important.
Assigning the redox value to the chlorine value in the
Assigning the redox value to the chlorine value in the
pool is more important; see section Determining the
pool is more important; see
redox (mV) setpoint.
redox (mV) setpoint.
12.4.1
Execution
Redox (mV) calibration can be found in the following menu:
Redox (mV) calibration can be found in the following menu:
Calibration mV (Redox)
Calibration is executed as follows:
Calibration is executed as follows:
Selection 1-point calibration mV
point calibration mV
•
Calibration is a menu sequence, i.e. it goes
Calibration is a menu sequence, i.e. it goes through a series of
•
menus step-by-step.
12.4.1.1 Calibration input
The following parameters are displayed in the calibration menu:
The following parameters are displayed in the calibration menu:
Calibration mV (Redox)
For calibration value, enter the reference value for calibration, i.e. the
For calibration value, enter the reference value for calibration, i.e. the
redox value of the buffer solution being used (e.g. 465 mV).
redox value of the buffer solution b
Current value Redox (mV)
This is the current measured value calculated using the parameters
This is the current measured value calculated using the parameters
from the last calibration, which are still valid. This value may deviate
from the last calibration, which are still valid. This value may deviate
from the actual value under certain circumstances. It is only displayed
from the actual value under certain circumstances. It is only disp
to give you a certain level of orientation throughout calibration.
to give you a certain level of orientation throughout calibration.
Using the measured value, you can see when measurement has
Using the measured value, you can see when measurement has
stablised when you place the electrode into the buffer solution.
stablised when you place the electrode into the buffer solution.
®
36
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