Operating instructions
CF Control 100
7 Calibrating pH electrode and chlorine value
7.1 Calibrating the pH electrode
The pH electrode is to be re-calibrated at regular intervals, e.g. every 4 weeks and
after each commissioning. This informs the CF Control 100 about the current
operating status of the probe, which changes during operation. You need calibration
solutions pH4 and pH7 with the red and green covers to carry out a calibration.
The system must be switched off before you carry out a calibration. The LED
must be off.
Immerse the pH electrode in buffer solution 7.0 and wait until the measured value
does not change any more.
Press for at least 3 seconds - the following is displayed:
Dry the pH electrode with a soft paper towel.
Immerse the pH electrode in buffer solution 4.0 and wait until the measured value
does not change any more.
Press again for at least 3 seconds - the following is displayed:
The calibration is complete.
The calibration process is not started if
dosing is switched on,
the set authorization code does not permit this,
the voltage of the pH electrode is outside the range of
o -58mV and + 58mV for pH=7
and
o +116mV and +232mV for pH=4
If the voltage is outside the above range during the calibration process, the following
error message is displayed:
WARNING: Flush the electrode with water and dry it with a soft paper towel or
clean it with a probe cleaner (0181-184-01) before immersing it in the buffer
NOTE: Please observe the information about maintenance and servicing of
the electrodes (enclosed with the electrode).
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