5
1. Theory
The redox potential or oxydation-reduction potential (ORP) is an electric value that is a parameter
for oxydation and reduction process in the water. The redox potential is of special interest in the
aquarium:
•
To check the water quality in a seawater aquarium. The ideal range is between 300 and 400
mV. It can be raised to the desired value by injecting ozone into the protein skimmer. The
higher the values are, the higher the percentage of oxydation is – the „cleaner” the water is.
•
To control anaerobic denitrifying filters. Here, the redox potential is used to check the activity.
The ideal range for these filters is between -50 and -100 mV .
The redox potential is also used as a control parameter in other processes. In swimming pools, the
chlorination can be controlled by the redox potential. The minimum value for disinfection is +700
mV.
2. Delivery
The Aqua Medic
mV controller
has to be supplied with a redox electrode. We recommend to use
the maintenance-free electrode of Aqua Medic. The ozonizer can be connected to the main plug.
1. Display
4. Set point adjustion (SET)
2. Indication socket on / off
5. Connection for electrode (BNC)
3. Changeover switch measuring – SET
6. Power supply and socket (no pict.)
3. Starting
1.
Connect the main plug to 100 - 240 V, if not indicated otherwise.
2.
Connect the mV electrode (at 5).
3.
Switch (3) to „mV“ (measuring).
The redox potential controller needs no additional calibration. However, it takes about 24 hours
until the value shown in the display is constant. If used constantly, the electrode should be
immersed all the time.
4. Controlling
Adjustion of set point:
•
Turn key 3 to „SET “(nominal value). Adjust key 4 (set point adjustion) to the nominal value.
•
Turn switch 3 back to „mV” (measuring).
