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Calibrating the controller diaLog DACb
15.1.4.1
Selecting the calibration process for amperometric measured variables
Selecting the calibration process
94
Combined calibration of pH and chlorine
It is mandatory that the pH measurement is always
calibrated first and then the chlorine measurement.
All other calibration of the pH measurement must
always be followed by calibration of the chlorine
measurement. Otherwise the chlorine measure‐
ment will be inaccurate.
Free chlorine or total available chlorine
Calibration of the zero point is not necessary.
Slope: Possible calibration in the range: 20% ...
300%.
A slope below 70% indicates a blockage of the dia‐
phragm. Refer to the operating instructions for your
sensor.
A slope of over 150% with sensors CLE3/CLE1
indicates surface-active components (surfactants)
in the sample water. Replacing the diaphragm only
delivers short-term improvement. It is important to
prevent the occurrence of surfactants in the water.
If surfactants cannot be avoided, then use an
appropriate sensor, for example sensor type CBR.
There are two calibration processes available for calibrating the
controller:
Calibrating the slope
n
Calibrating the zero point
n
1.
Continuous display ➨
CAL Cl
Last calibration 31.03. 2013 13:11:11
Slope
Zero point
Slope calibration
Calibration of zero point
Fig. 58: [Chlorine] calibration menu
ð The calibration menu is displayed.
2.
Use the arrow keys to select the chosen menu item. Press
ð You can now start your chosen calibration process.
100 %
4.00 mA
A1039
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