Aqua Medic mV computer Mode D'emploi page 6

4. Installation
1. Connect to 230 V power source.
2. Connect the mV-probe.
The unit is now ready for programming.
5. Adjustment of control direction
The status of the control direction is shown at the LED's at the side (3):
Low: An adjusted minimum set point is controlled by adding an oxydizing agent (e. g. ozone). The direction of
control is upwards. This is the standard mode for controlling the ORP with Ozone in marine aquaria or for
controlling a Nitratereductor with air or dosing pump.
High: An adjusted maximum set point is controlled by adding a reducing agent. The direction of control is
downwards. To change the control mode between high and low, press Prog./Enter (2) and the High/Low button
(7) simultaneously. The actual mode is shown by the LED's (3).
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 by using the + and – buttons. By
pressing the Prog./Enter button again, the set-point is saved and the display switches back to the
actual value. The hysteresis should be between 5 - 10 mV. If it is too low, the computer will switch
on and off in a very short time. If it is too high, the accuracy will be bad.
7. Sensor calibration
The measurement of the redox-potential is an absolute measurement of voltage. The mV computer does not
need to be calibrated. Differences may be caused by the electrode. They can be checked with the included
standard solution. If the differences are small (up to 20 mV) the probe can still be used. If the differences are
higher, the probe must be cleaned, refilled or replaced. For continuous measurement of the redox-potential, the
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 redox-potential value falls below or rises above the desired adjusted
value, the unit activates the power plug. This is indicated by the LED out (5).
Fig. 2: Example of set-up - mV-monitoring and controlling at the aquarium with an Ozonizer
1. mV computer
2. Ozonizer
3. Membrane air pump
4. Connection plug
5. mV-electrode
6. Protein skimmer
7. Aquarium
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