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1.4 Assembly advice
Control units
The reverse side of the control unit has recesses that are used to lock the fastening rail which is fixed to the wall or
the aquarium cabinet with the screw set . The cable to the control unit has a USB connector so that holes of control
unit dimensions do not need to be sawn out of the terrarium cabinet . The USB connector is not designed for a compu-
ter connection . The control unit has a 2 metre cable which permits installation outside the aquarium cabinet as well
as an unobstructed view of all values and status modes .
Connection strips
The connection strip should be screwed to the back or side panel inside the aquarium cabinet to ensure that there is
no contact with the unit in the event of water leakage .
BNC connector
The Dupla Twin-Control system is equipped with a BNC connector for pH electrodes .
Temperature sensors
Position the temperature sensor at a place inside the aquarium with good water flow . It should not be installed near
the heater . Fasten it in a manner which prevents the sensor from coming loose and ensures it is always completely
submerged . Otherwise, incorrect readings and an overheating of the aquarium could be the result . For easy replace-
ment in case of malfunction the temperature sensor is connected to the control unit with an USB plug .
2. Description of the basic functions
2.1 Function monitoring of external devices
The housing is fitted with LEDs . In operating mode this indicates the active control of the external device .
2.2 Safety shutdown during programming
When entering into programming mode, both slots are deactivated for safety reasons .
2.3 Overwrite function
On slot 1 either pH control or temperature control can be selected . Any previously entered temperature values are
deleted by the pH settings and vice versa .
On slot 2 either temperature 2 control or time control can be selected . Any previously entered temperature 2 values
are deleted by the timer settings and vice versa .
2.4 Safeguard function
To protect electronic components, a delay of 60 seconds is set between 2 switching states before the respective slot
becomes active again .
2.5 Interval reset
Irrespective of the time of day, all programmed intervals start when the device is switched on or the menu is quit .
2.6 Return function
The Dupla Twin-Control pro automatically returns to operating mode when no button has been pressed for a period of
90 seconds while in the programming mode .
2.7 Memory function
To safeguard against loss of data in the event of a power failure, the Dupla Twin-Control stores the set values for pH
regulation, temperature control and time periods . The unit will continue to calculate the time for up to five hours after
such an event, so the clock does not need to be reset after brief power failures .
2.8 Malfunction display
A not connected temperature sensor, a not connected pH-electrode, a sensor fault or short circuit of the temperature, a
pH-electrode defect or programming error in the time settings will be indicated as an error, see item 8 of this instruction.
