1. Interference-free acquisition of measured values
A microcomputer translates all values into a series of "on" or "off" signals in preparation for digital processing. Minor interference is thus effectively squelched and the effects of even major interference signals will be minimized.

2. Alarm when limit values are violated
The threshold values for triggering an alarm can be adjusted separately, upward or downward. If the temperature or pH value measured moves outside these limits, a warning is given with a signal tone and an indicator lamp.

3. Intelligent control of CO2 addition with the Dupla-pH-Control MP unit
The microprocessor divides the control procedure into two phases : "bracketing" control and control with set-point value optimizing. The bracketing control mode goes to work where there is a wide deviation between the desired pH value (set-point value) and the pH value actually being measured (current value). The difference between the set-point and current values is first measured. The correction is initially targeted on the behalf of this differential.

After a brief pause and once the pH value has risen by 2/100 pH, the unit once more adjusts to half of the remaining difference. This cycle is repeated until the distance between the set-point and actual values has been narrowed to less than 1/10 pH; the optimizing set-point control feature is then activated. The processor now takes into account all the aquarium parameters (size, residual CO2 in the reactor, filter system, etc.) The processor "gets acquainted with" the aquarium. Once this learning phase is completed, it is possible to achieve control to accuracy of +/- 0.02 pH.

4. Connecting recorders and host computers
Every unit in the Dupla MP series is equipped with a recorder output port making it possible to log all desired measurement data, transmit data to remote sites, and store data in EDP systems.