Aqua Medic pH-Computer Bedienungsanleitung Seite 10

To change the control mode between High and Low, press 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 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
Clean the pH probe in distilled water and place the probe in the pH 7 calibrating fluid. Press the
Prog/Enter button and Cal 7 button simultaneously – the display is flashing and is set to ph 7.
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. It should correspond to the aquarium's water temperature.
pH 4
Clean the pH probe in distilled water and place the probe in the pH 4 calibrating fluid. Press the
Prog/Enter button and Cal 4 button simultaneously – the display is flashing and is set to pH 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. It should correspond to the aquarium's water temperature.
For continuous measurement, the pH-probe must be securely placed 5 cm below the surface of the
water and the shaft has to be kept dry (we recommend the Aqua Medic electrode holder).
The unit is now ready for use. As soon as the pH-value exceeds the desired adjusted value, the
unit activates the power plug.
9. Probe
The Aqua Medic probe is specifically designed to determine the pH-value in fluid based solubles. It
can be used in the chemical industry, medical areas and in research laboratories.
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