Care And Maintenance - Dennerle Evolution Space Notice D'emploi

The CO2 long-term test Correct from Dennerle provides the simplest
means of measuring the CO2 content. When the test shows a GREEN
reading, the water contains exactly the right level of CO2.
4.3 Setting the number of bubbles
The required number of bubbles is dependent on various factors, such
as the stock of plants, water movement, lighting intensity, etc. The ap-
propriate CO2 supply level thus requires to be determined individually
for the specific aquarium concerned.
Rule of thumb for the basic setting: Begin at approx. 10 bubbles per
minute per 100 l of aquarium water, i.e. 2 x 10 = 20 bubbles per mi-
nute for a 200 l aquarium.
Adjust the CO2 supply to the desired CO2 content in small steps spread
over several days. Please note: The more vigorously the surface of
the water is set in motion, the more CO2 will be expelled from the
aquarium again.
Reusable cylinders: Slowly open the cylinder valve.
•
• Slowly turn the setting knob on the pressure reducer towards " +
" until the desired number of bubbles is attained on the bubble
counter.
Please note: After adjusting the pressure reducer, there is always a
delay before the number of bubbles is altered accordingly (the hose
acts as a pressure buffer). The number of bubbles should thus be set
in small steps, always waiting a couple of minutes until the new set-
ting has stabilised.
Note: If the setting knob is turned towards " – " in larger steps of
around 1 complete turn, the pressure reducer will release the super-
fluous pressure through a small vent hole – audible as a brief hiss. This
venting serves to quickly stabilise the newly set number of bubbles.
• Check the number of bubbles regularly in the first few days, cor-
recting as necessary. After this initial period it is generally suffi-
cient to check the number of bubbles once a week.

5 Care and maintenance

5.1 Replacing the CO2 cylinder
5.1.1 Reusable CO2 cylinder
• Empty cylinder: Close cylinder valve. Unscrew coupling ring and
screw pressure reducer onto refilled reusable CO2 cylinder. Open
cylinder valve The bubble count setting will be retained.
• Full cylinder: Close cylinder valve. With the solenoid valve open,
turn the setting knob on the pressure reducer to fully open posi-
tion, in order to release any residual pressure in the pressure re-
ducer. Unscrew coupling ring and screw pressure reducer onto
refilled reusable CO2 cylinder. Open cylinder valve Reset number
of bubbles.
• Always close the cylinder valve in order to shut down the CO2
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supply for a prolonged period. Unscrew the pressure reducer
when the cylinder is to remain out of use for a prolonged period.
5.1.2 Disposable CO2 cylinder
• The pressure reducer can be unscrewed again at any time – the
cylinder valve closes automatically.
• Screw pressure reducer onto new disposable CO2 cylinder (see
3.1.2). The bubble count setting will be retained.
• Unscrew the pressure reducer when the cylinder is to remain out
of use for a prolonged period.
5.1.3 Disposable CO2 cartridge
IMPORTANT: Unscrew pressure reducer from cartridge only
when cartridge is empty!
• Ensure that the cartridge is totally empty. For this purpose, with
the solenoid valve open turn the setting knob to fully open posi-
tion and check whether any bubbles issue from the bubble coun-
ter or the CO2 diffusor.
• Slowly unscrew the CO2 cartridge from the pressure reducer.
• Close the setting knob again.
• Screw new CO2 cartridge (art. no. 2994) into pressure reducer
(see 3.1.3).
• Reset number of bubbles.
5.2 Testing the CO2 backflow check valve
The check valve protects your valuable pressure reducer from corro-
sion caused by back-flowing water. As dirt particles may collect on the
sealing surfaces over the course of time, the backflow check valve
should be checked at least once a year and replaced every 2-3 years
for safety's sake.
Tip: Install a transparent test hose temporarily between backflow
check valve and pressure reducer and shut down the CO2 supply for
24 hours (close cylinder / pressure reducer). If there is water in the
test hose after this 24-hour period, this indicates a leak on the backflow
check valve.
The opening of the check valve can only be tested with CO2, as a mi-
nimum pressure of approx. 0.3 bar is required to open the valve. It is
not possible to "blow through" the valve with your mouth.
Please use only check valves designed for use with CO2, such as the
special CO2 check valve from Dennerle. Standard air check valves may
become brittle through contact with CO2 within only a short space of
time, resulting in leaks.
Corrosion damage on the pressure reducer as a result of water ente-
ring into the device is excluded from the guarantee coverage.