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GA EvolutionDeLuxe 1-06511-1107_GA pH ControllerEvol.Del. 13.06.2013 09:45 Seite 29
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7.3 Checking the set pH value
• Press "pH" key: The green LED next to the key will flash; the display shows the set pH value.
• After 3 sec. the actual value appears again on the display, the green LED switches to conti-
nuously lit mode and the controller resumes normal operations.
8 Control operations in normal operating mode
Example 1: Current pH value in the aquarium = 7.5. You set pH 6.8.
The green "CO
supply" indicator lamp lights up.
2
and CO
is supplied (according to the number of CO
2
needle valve of the pressure reducer). CO
aquarium, after which the pH-Controller switches off the solenoid valve.
Example 2: Current pH value in the aquarium = 6.5. You have set pH 6.8.
The green "CO
supply" indicator lamp does not go on. No CO
2
lue in the aquarium rises above 6.9* will the pH-Controller reactivate the supply of CO
*When switching values of 0.1 are preset (factory setting); see also Point 10.2
9 pH value, CO
content and CO
2
9.1 Why it is possible to set the pH value with CO
Some of the CO
content in water dissolves to form carbonic acid, thereby lowering the pH va-
2
lue. The extent to which the pH value is lowered is determined to a substantial degree by the
carbonate hardness. The carbonate hardness acts as a buffer and thus counteracts lowering of
the pH value.
A precisely defined correlation always applies between CO
(see table). When two values are known, the third can be calculated.
9.2 Setting the right CO
For magnificent plant growth, DENNERLE recommends a CO
15 and 30 mg/l, whereby 20 to 25 mg/l is ideal.
• Measure the carbonate hardness of the aquarium water (tests available from specialist
retailers).
• Read the pH value which corresponds to the desired CO
pH value on the pH-Controller.
Example: Carbonate hardness 4 °d, recommended pH 6.8.
Important note: Only set such pH values and CO
cording to the carbonate hardness. Should you wish to set a pH of 6.5 for certain species of fish,
for example, the carbonate hardness should be lowered to 2-3 °d. The CO
be higher than 40 mg/l on a prolonged basis.
See also the relevant literature on this subject or ask your pet specialist!
The connected CO
bubbles per minute set beforehand on the
2
is supplied until a pH value of 6.7* is attained in the
2
is supplied. Only when the pH va-
2
supply level
2
content, carbonate hardness and pH
2
level and the right pH
2
level in the aquarium of between
2
content from the table. Enter this
2
content levels as are tolerable for your fish ac-
2
solenoid valve is open
2
.
2
2
content should not
2
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