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GA EvolutionDeLuxe 1-06511-1107_GA pH ControllerEvol.Del. 13.06.2013 09:45 Seite 31
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10.2 Setting the switching values
The "Hys" function enables the switching values (hysteresis) to be set at which the pH-Controller
is to activate and deactivate the supply of CO
Example 1: Switching values 0.1 - pH setting 6.8
The pH-Controller switches on the CO
and off when it drops below 6.7.
Example 2: Switching values 0.01 - pH setting 6.8
The pH-Controller switches on the CO
and off when it drops below 6.75.
• Press "Hys" key: The currently set value appears on the display.
• Set the desired value with "+" and "
• When the keys remain unused for 3 sec., this value will be adopted. The pH-Controller con-
trols the pH value accordingly.
Possible values: 0.01 – 0.05 – 0.1 – 0.15 – 0.2. Factory setting: 0.1 (recommended).
11 Automatic calibration reminder
The yellow LED "Calibration reminder" reminds the user automatically every 4 weeks that the
electrode is due for re-calibration (the pH7 LED lights up at the same time).
the calibration procedure, see point 12.
The calibration reminder does not affect the normal measuring and control functions of the pH-
Controller.
12 Supplementary calibration
Additional calibration of the electrode is possible at any time, irrespective of whether the calibra-
tion reminder is active:
• Press "pH 7". The "pH 7" LED and the "Calibration reminder" LED light up.
• If key "pH 7" is pressed again within 1 minute, the controller will switch from normal control
mode to calibration mode. The "pH" LED will go off and the connected solenoid valve will be
switched off.
• 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.
• Press "pH 7". The yellow LED flashes, the devices now calibrates automatically at pH 7, the
display shows "E 7".
• Now calibrate as described under Point 5.3 Calibration procedure.
Additional calibration of the electrode should be carried out in particular 1 week after starting up
the pH-Controller for the first time or connecting a new pH-electrode.
13 Warnings
13.1 Flashing display
The display will flash if the pH value in the aquarium deviates from the set value by more than
+ 0.5 or 0.5. In such cases, the system should be checked immediately:
• Is there any CO
left in the cylinder?
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• Is the number of bubbles per minute set correctly?
.
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supply when the pH value in the aquarium rises above 6.9
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supply when the pH value in the aquarium rises above 6.85
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_
".
With regard to
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