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GA EvolutionDeLuxe 1-06511-1107_GA pH ControllerEvol.Del. 13.06.2013 09:45 Seite 27
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pH 7
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pH 4
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5 Calibrating the pH-electrode
5.1 Purpose of calibration
Any measuring instrument can only be as accurate as the connected sensor. The pH-electrode is
thus a vitally important part of the pH measuring device.
As the setting of any pH-electrode may drift in the course of time, in order to ensure a constant-
ly high quality of measurement results it is vital to calibrate the pH-electrode on a regular basis.
5.2 Preparing for the calibration process
For optimum calibration values, the calibration solutions should have a temperature of 20-25 °C.
Pour pH 7, pH 4 calibrating solution and distilled water into the appropriate chambers of the
calibrating station up to the filling mark.
5.3 Calibration procedure
The user-friendly calibration process provides for swift, reliable and convenient calibration of the
pH-electrode:
• Rinse electrode briefly in distilled water.
• Place electrode in pH 7 calibrating solution.
• Wait approx. 1 minute for the electrode to adapt to the calibrating solution.
Adaptation is complete when the displayed measurement value no longer alters.
(Note: When calibrating with pH 7 for the first time after initial start-up of the device, "E" will
be shown on the display, instead of a measurement value. One calibration process requires to
be carried out successfully in order to display the measurement value).
• Press key "pH 7": The yellow LED flashes, the device now calibrates automatically at pH 7,
the display shows "E 7".
• When pH 7 has been successfully calibrated, the LED will go off and "7.00" will appear on the
display. The LED on key "pH 4" now lights up.
• Remove electrode from pH 7 calibrating solution and rinse briefly in distilled water.
• Place electrode in pH 4 calibrating solution
Wait until the displayed measurement value no longer alters.
• Press key "pH 4": The yellow LED flashes, the devices now calibrates automatically at pH 4,
the display shows "E 4".
• When pH 4 has been successfully calibrated, the LED will go off and "4.00" will appear on the
display. The "Calibrate reminder" LED also goes off.
This completes the calibration process. Rinse the pH-electrode with a little distilled water and hang
in the aquarium in the electrode holder. The calibration process takes around 5 to 10 minutes,
depending on the condition of the pH-electrode. Dispose of used calibrating solution. Rinse out
calibrating station with tap water and dry with kitchen paper to avoid scale residues.
The pH-Controller is now ready for use.
The display shows the current pH value in the aquarium.
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