Sera PRECISION seramic Mode D'emploi page 9

For fixation:
1) unscrew and slip the hose into the retainer ring of the CO
intake ( ).
2) insert the hose into the plastic nozzle of the CO
( ) as far as possible.
3) screw and tighten the retainer ring to the CO
(see fig. 7).
In the similar fashion, connect one end of the second hose to
the outlet ( ) of the CO
2
the hose to the non-return valve.
Caution: The seramic CO
should always be installed with a
high-quality non-return valve
(e.g., sera non-return valve, item No. 8818).
4. Operational features, displays and
adjustment of desired pH value
The illustration shows the front panel of the CO
The unit is equipped with 4-digit liquid crystal display to
show:
• present pH value
• desired pH value
solenoid valve open (green LED is on)
unit switched on (yellow LED is on)
calibration of pH electrode
CO outlet
2
CO intake
2
lower desired pH value / calibration pH electrode pH 9.2
adjustment of desired pH value / raise desired pH value /
calibration pH electrode at pH 7.0
The light-emitting diodes in the controller unit show:
- the power supply (yellow light is on)
- the CO valve is opened (green light is on)
2
Adjustment of desired pH value:
The display normally shows the present pH value. When you
press the key
8
controller unit and the other end of
control system
2
2
the desired pH value blinks on the display. You can adjust to
the desired pH value by either pressing the key
2
intake
2
intake ( )
2
to increase the pH value or pressing the key
to lower the pH value. The change of the desired pH value is
carried out in steps (by pressing the key) of 0.1 pH units. The
controller system immediately takes over the new desired
value.
controller.
When the keys are not pressed for 5 seconds, the display will
return to read and show the present pH value. The display
keeps blinking while you adjust the desired pH value. The
newly adjusted value is saved in memory, it is not lost if the
supply voltage is interrupted.
5. Starting up
ALWAYS soak the pH electrode in sera dest or some other
chlorine-free water for at least 12 hours before installing (be
sure to remove the protection cap first). Connect 'BNC' plug
of the pH electrode to the corresponding socket of the con-
troller unit (see fig 9). Then plug in the electrical cord of the
controller unit to your power supply outlet.
The next step is calibrating the pH electrode. Fill 10 ml of the
test solution pH 7.0 into a small clean vial (e.g., measuring vial
of a sera test). It is important to close the bottle of the test
solution immediately after. The pH electrode must be rinsed
with distilled water first. Now you go on with the calibration
process:
1) Press and hold down the key
for 5 seconds. The display will show:
2) Now the pH electrode must be immersed into the pH 7.0
test solution vial. Then press the key