Aqua Medic pH-Computer Mode D'emploi page 10

4. Installation
1. Connect the ph-electrode.
2. Connect to 230 V power source.
The unit is now ready for programming.
5. Adjustment of the control direction
The status of the control direction is shown at the LED's at the side:
High – an adjusted maximum set point is controlled by the addition of a reducing agent. The
direction of control is downwards. This is the standard mode for controlling the pH in fresh
water aquaria or in Calciumreactors in reef aquariums by the addition of CO
Low – an adjusted minimum set point is controlled by the addition of an oxydizing agent (e. g.
ozone). The direction of control is upwards.
To change the control mode between High and Low, press the Prog/Enter and the High/Low
button simultaneously. The actual mode is shown by the LED's (4).
6. Adjusting the set point
To adjust the set point, press the Prog/Enter and the SET buttons simultaneously. The adjusted
set point is now shown on the display – flashing. It can be changed with the + and – buttons. By
pressing the Prog/Enter button again, the set-point is saved and the display switches back to the
actual value.
7. Adjusting the hysteresis
The hysteresis is the range between switching on and off. If the set point is adjusted to pH 7.00
and the hysteresis is set to 0.05 pH, the unit switches on if the set point of pH 7.00 is reached and
after reaching 6.95, it switches off again. We do not recommend to adjust the hysteresis to very
low values, e. g. 0.01 pH, because this will result in too frequent switching. A good value for the
hysteresis is 0.05 pH.
To adjust the hysteresis, press the Prog/Enter and the Hys buttons simultaneously. The adjusted
hysteresis is now shown on the display – flashing. It can be changed with the + and – buttons. By
pressing the Prog/Enter button again, the value is saved and the display switches back to the
actual value.
8. Sensor calibration
Calibration
The standard pH 7 and pH 4 calibrating fluids are used to calibrate the pH probe.
pH 7.00
1. Clean the pH probe in distilled water.
2. Place the probe in the pH 7 calibrating fluid.
3. Press the Prog/Enter button and Cal 7 button simultaneously – the display is flashing and is
set to ph 7.00.
4. After 30 seconds, the calibration is completed and the indicator stops flashing. The pH-value of
the calibration fluid is shown.
Note: Pay attention to the temperature. If necessary, measure the temperature of the calibration
fluid.
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