Sera PRECISION seramic pH Controller Manual De Instrucciones página 16

Altering the hysteresis
The hysteresis for switching on/off tells how wide the
switching range between switching on and off is. With
an adjusted desired pH value of pH 7 and a switching
hysteresis of 0.1 the solenoid valve will switch on the
CO supply at pH 7.1, and will switch it off again when
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the pH value sinks below pH 7. The switching hystere-
sis avoids the solenoid valve switching on and off every
time there is a minor variation. Wear and tear of the
solenoid valve is reduced.
When pressing the keys
at the same time, the display will show the values for
the hysteresis for switching on/off flashing.
You can increase or lower it with the arrow keys. Press
the key
after the desired switching hysteresis is attained. The
value will be stored when you hear the signal sound,
and the unit immediately returns into normal measur-
ing mode.
The arrow keys allow to change the value in separate
steps even from the second decimal place by pressing
them permanently. If you press the arrow key perma-
nently without removing the finger, after a few sec-
onds the value will accelerate getting higher or lower
with short intervals.
This allows even large alterations of the desired value
or the hysteresis.
Changing from Hi to Lo
The operation mode "Lo" allows lowering the pH value
by adding CO (operation mode for controlling CO
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tilization system and calcium reactor).
The LED beside Hi/Lo will glow red if you have selected
this operation mode.
If you choose the unit setup for raising the pH value
with buffer solutions, you must switch the seramic to
the operation mode "Hi" (raising the pH value). Press
the keys
at the same time.
You will now hear a signal sound, and the LED beside
Hi/Lo will glow green. The operation mode "Hi" is now
selected. If you repeat this procedure you will switch
the unit back into the operation mode "Lo."
8.3 Assembly of the pH electrode in freshwater aquar-
iums
Attach the two suction cups (supplied) or the universal
holder (3.6) to the pH electrode shaft. Then place and
attach the suction cups with the pH electrode to the in-
side glass of the aquarium. The pH electrode should have
the correct immersion depth (10), and if possible, be
set in a dark place. Avoid areas with a strong current.
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 it is necessary to recalibrate every few days for 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.
and
and
8.4 Installing the pH electrode in a calcium reactor
(see 1.1.2)
8.5 Activating and dosing CO
First open the solenoid valve for activating the CO
supply. You must set the desired value on the control
unit to a value below the displayed actual pH value to
do so. The opening of the solenoid valve is indicated by
the red LED (OUTPUT).
Then pull the CO
ty reasons and place the loose end in the aquarium
water or a glass filled with water. This allows you to
pre-adjust the bubble number without the risk of dam-
aging parts of the system by too high pressures.
Now open the CO
with external valve only: Open the CO
slowly and slightly opening the hand-wheel).
The CO supply at the pressure reducer is opened. How-
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ever, the pressure on the operating pressure manome-
ter must not exceed 1 bar (14.5 psi.). Consider the res-
pective data provided by the manufacturer.
Now put the CO
Shortly after opening the needle valve, CO
into the aquarium.
For functional control, now raise the desired pH value
until the solenoid valve switches off. If the desired
value is lowered, the solenoid valve opens again.
Do not forget now to re-adjust the desired pH value!
value of carbonate
hardness
0
1
2
3
fer- 4
2
5
6
7
8
10
12
15
20
21 and higher
After a few days, you can continue to lower the pH value
in steps of one-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 hard-
ness, the more CO
value. Large amounts of dissolved CO
conditions for the water plants but may not be tolerated
equally as well by all the fish.
With the values as stated in the 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 influences, such as a heavily burdened
filter or a dead fish that has not been removed imme-
diately, will cause the pH value to drop drastically (acid
drop). We recommend increasing the carbonate hard-
ness with sera KH/pH-plus if it is below 4°dKH.
16
2
hose off the bubble counter for safe-
2
addition at the bottle (for bottles
2
2
hose back on the bubble counter.
2
pH adjustment at the control unit
use sera KH/pH-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
peat
is required in order to lower the pH
2
improve the living
2
2
at the bottle by
will flow
2
, pH value and
2