Sera PRECISION seramic Mode D'emploi page 10

The display will show:
As soon as the controller unit measures a constant pH
value over a certain period (typically 60 seconds), this seg-
ment of calibration is complete. Remove the pH electrode
from the pH 7.0 test solution vial and rinse it with distilled
water. Begin the calibration of pH 9.2. Fill 10 ml of the test
solution pH 9.2 into a small clean vial. You must use
uncontaminated vial, thoroughly rinse the vial with distil-
led water before filling. Immerse the pH electrode into
the pH 9.2 test solution vial. The calibration process con-
tinues:
3) Press the key
(Caution: Do not press the key "CAL" first.) The display will
show:
As soon as the controller unit measures a stable pH value
over a certain period, this calibration step is complete.
Remove the pH electrode from the pH 9.2 test solution
vial and rinse it thoroughly with distilled water.
The seramic CO control system is now precisely calibrated.
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Attach the two suction holders (supplied) to the pH electrode
shaft. Then place and attach the suction holders with the pH
electrode to the inside glass of the aquarium. The pH elec-
trode should have the correct immersion depth (see fig. 10,
"Immersion depth of electrodes"), and if possible in a dark
place (see fig. 11). Do not place the pH electrode close to the
reactor. This may result in false reading of pH measurement.
A new pH electrode needs a period of 'breaking in', and is
necessary to recalibrate after some days within the first few
weeks. Follow the procedure as described above. On the
premise that the pH electrode is used constantly, recalibrate
the pH electrode every 4 – 6 weeks after that.
6. Activating and dosing CO
The solenoid valve of the controller unit is open when it acti-
vates and doses CO . This requires adjustment to the desired
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pH value of minimum 5.0 (see section 4, adjustment of desired
pH value). The opening of the solenoid valve is shown by the
green light-emitting diode.
Now open the CO addition at the bottle (bottles with outside
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valve only!).
The CO flow is opened at the pressure reducer until the op-
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erational pressure manometer display reads 0.5 bar. To do so,
completely open the adjustment screw for the operational
pressure. Then it must slowly be closed again until the re-
quired value is reached. Consider the respective data pro-
vided by the manufacturer.
After opening the fine adjustment valve, CO
the aquarium via the control system very quickly.
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is released into
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For functional control, now raise the desired pH value until
the solenoid valve switches off. If the desired value is low-
ered, the solenoid valve opens again.
Use the key " " and the key " " for function control. Initially,
refer to the following chart for the best possible way, suitable
condition for your fish. Carbonate hardness is very important
to the aquarium water and must be first checked with sera
kH-Test.
value of carbonate hardness
}
0
1
2
3
4
5
6
7
8
10
12
15
20
21 and higher
After some days, you can continue to lower the pH value in
steps of a tenth of a pH unit, e.g., from 7.0 to 6.9. When doing
so, watch out for accelerated breathing behavior of the fish.
If this happens, reverse to the last pH value. Remember! The
higher the carbonate hardness, the more CO
order to lower the pH value. Large amount of dissolved CO
improves the living conditions for the water plants but may
not tolerate equally well by all fish.
With the values as stated in the above chart, CO
carbonate hardness are in equilibrium.
With low carbonate hardness ( < 4°dKH), the buffering capacity
(ability to bind acids) of the water is at a high risk. Negligible
influence, such as heavily burdened filter or a dead fish not
removed immediately, will cause the pH value to drop drasti-
cally (acid drop). We recommend to increase the carbonate
hardness with sera kH-plus if it is below 4°dKH.
The following tips and error checklist (see page 11) are impor-
tant and we urge you to read and understand it thoroughly.
Important tips for pH electrode care
a) Do not use the pH electrode during treatment of fish dis-
ease, treatment of algae or combat of snail infestation
(electrode contamination)! A contaminated electrode
cannot be repaired and is not covered under warranty
claim! Remove the electrode from the aquarium during
treatment and put it into the protection cap, filled with
sera care solution KCl. Do not forget to switch off the CO
control system, shut off the pressure reducer valve and
remove the plug of the controller unit. Otherwise, uncon-
trolled CO addition to the aquarium can occur without
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the pH electrode.
b) If the display on the controller unit does not remain sta-
ble after a certain time during calibration in the test solu-
pH adjustment at
the control system
use sera kH-plus
to increase
carbonate hardness
to 4°dKH
6.8
6.9
6.9
6.9
7.0
7.1
7.2
7.4
7.5
first lower the carbonate
hardness by filtering via
peat, e.g. sera super active
blackpeat granulate
is required in
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, pH value and
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2
2
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