Dupla Twin-Control Datasheet

www.dupla.com
Dohse Aquaristik GmbH & Co. KG
Item no. 80288 · Status: 03/2013 ·Version: 1.1
Twin-Control
Dohse Aquaristik GmbH & Co. KG · www.dohse-aquaristik.com
Using instruction

2
Summary
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Control units and connection strips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Assembly advice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Description of the basic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Function monitoring of external devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Safety shutdown during programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Overwrite function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Safeguard function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.5 Interval reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.6 Return function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.7 Memory function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.8 Malfunction display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Description of the programmable functions. . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Clock programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.1 Time setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Temperature 1 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.2 Setting the temperature 1 value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.3 Alarm setting temperature 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.4 Deactivation/activation of the audible temperature 1 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 pH programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3.1 pH set point programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3.2 CO2-night off function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3.3 pH alarm programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3.4 Deactivation/activation of the audible pH alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3.5 Calibration pH electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3.6 Calibration reminder function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Temperature 2 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4.2 Setting as second temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4.3 Alarm setting temperature 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4.4 Deactivation/activation of the audible temperature 2 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4.5 Setting as first temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5 Timer programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5.1 Setting the timer control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5.2 Programming turn-on and turn-off times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5.3 Programming interval control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.6 Manual activation/deactivation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.7 Display light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.8 Calibration of the temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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4. Quick start guide to programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. Programming Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Clock programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1.1 Time setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 Temperature 1 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2.2 Setting the temperature 1 control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2.3 Setting the temperature 1 value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.4 Alarm setting temperature 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.5 Deactivation/activation of the audible temperature 1 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 pH programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3.1 pH set point programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3.2 CO2-night off function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.3 pH alarm programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.4 Deactivation/activation of the audible pH alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.5 pH electrode calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3.6 Calibration reminder function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.4 Temperature 2 programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4.1 Choice of HEAT / COOL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4.2 Setting as second temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.4.3 Alarm setting temperature 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.4.4 Deactivation/activation of the audible temperature 2 alarm. . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.4.5 Setting as first temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.5 Timer programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.5.1 Setting the timer control mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.5.2 Programming turn-on and turn-off times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.5.3 Programming interval control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.6 Manual activation/deactivation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.7 Display light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.8 Calibration of the temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6. Reset to factory presetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7. Factory presetting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8. Sources of faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9. Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
10. EC declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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1. Introduction
1.1 1.1 Control unit and connection strip
Connection strip
LED
Slot 1 for control of temperature 1
(HEAT / COOL) / pH
Slot 2 for control of temperature 2
(HEAT / COOL) / timer
Connecting cable
Fastening rail
Set of screws for fastening rail
Cable tie
Suction element for fixing the sensor
Control unit
Temperature sensor
BNC connector

pH
pH
pH
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1.2 Display
pH pH
pH
= Displaying measured Temperature 1 or pH
= Displaying measured Temperature 2 or Time
= Displaying set pH or Temperature 1
= Displaying set Temperature 2 or Time
= Displaying current time
= pH (slot 1, alternative to Temperature 1)
= Temperature 1 (slot 1, alternative to pH)
= Temperature 2 for slot 2, when slot 1 is Temperature 1 control
= Timer (slot 2, alternative to Temperature 2)
= Calibration
= Set values
= Symbol for heating mode
= Symbol for cooling mode
= Symbol for CO2supply
= Symbol for alert (flashes simultaneously with pH or °C in case of alert
or flashes simultaneously with CAL to remind of the pH electrode calibration)
1.3 Safety instructions
The Dupla Twin-Control pro is designed exclusivly for use in enclosed rooms. All electronic components of the device
must only be operated whilst they are free from defects. Should the mains supply be damaged, please return to your
dealer for repair. Continued operation of the device may cause fatal injury from an electric shock. Ensure that the
control unit and connection strip can not come into contact with water.
Technical products must only be operated as supplied. Electronic components must not be modified in any way, and
the leads must not be shortened. Covers or housings must not be opened. If the product is damaged cease useage or
shut down immediatly by pulling the mains plug.

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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.

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For safety reasons in such an event the slots will be deactivated, for example to to prevent overheating of the aquarium.
Despite this safety measure, it is still advisable to only use submersion tube heaters with integrated thermostat and
safety cut-out function.
3. Description of the programmable functions
Slot 1 can be programmed for pH control or temperature control. Slot 2 can be programmed for (second) temperature
control or timer switch. This allows eight different combinations when using the Dupla Twin-Control for one or two
different aquaria.
• pH regulation + water heating (slot 1: pH / slot 2: Temp
2 HEAT)
• pH regulation + water cooling (slot 1: pH / slot 2: Temp
2 COOL)
• pH regulation + timer switch (slot 1: pH / slot 2: Time)
• water heating + substrate heating (slot 1: Temp
1 HEAT / slot 2: Temp 2 HEAT)
• water heating + water cooling (slot 1: Temp
1 HEAT / slot 2: Temp 2 COOL)
• water heating + timer switch (slot 1: Temp
1 HEAT / slot 2: Time)
• water cooling + timer switch (slot 1: Temp
1 COOL / slot 2: Time)
• water cooling + water cooling (slot 1: Temp
1 COOL / slot 2: Temp 2 COOL)
In programming mode, the functions can be configured in the following sequence:
3.1 Clock programming
3.1.1 Time setting
The factory presets the time at . The time setting however is not cleared during a resetting procedure.
3.2 Temperature 1 programming
3.2.1 Choice of HEAT/COOL
A convenient inversion function makes it possible to switch from HEAT to COOL . This permits connection to an
external cooling device instead of a heater to counteract any increase in temperature.
3.2.2 Setting the temperature 1 value
The temperature is regulated to a precision of 0.1 °C. The temperature can be set within the range of 10 °C – 40 °C.
The factory presets the temperature to 24 °C. It is possible to programme two turn-on/turn-off times to simulate the
drop in temperature at night. The Dupla Twin-Control pro has an automatic sorting function which will re-arrange the
time periods to the correct sequential order when exiting programming mode.
3.2.3 Alarm setting temperature 1
A visual alarm indicated by flashing if the temperature exceeds or drops below the programmed desired tempe-
rature 1 values. The factory setting is 0.0 (no alarm). An alarm window between +/- 0.1 °C and 10 °C can be set.
Example: Temperature 24 °C, alarm window +/- 2 °C means that an alarm is triggered below 22 °C and above 26 °C.

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3.2.4 Deactivation/activation of the audible temperature 1 alarm
The audible alarm can be switched or . The factory setting is , as otherwise an alarm could be trigge-
red immediately when the system is first put into service when the sensor is located outside the aquarium, where the
temperature may be either too high or too low.
3.3 pH programming
3.3.1 pH set point programming
The pH set point can be adjusted within the limits of 4.0 – 9.9. If the measured pH value is outside the display range,
values lower than 4.0 are displayed as , values higher than 9.9 are displayed as . Outside of these limits,
the pH channel is switched off. The pH-controlled CO2fertilisation is carried out through permanent measuring by a
connected Dupla pH electrode and switching of a connected Dupla CO2magnetic valve with a switch hysteresis (the
difference between the switching point and the triggering point) of 0.1 pH and a control accuracy is +/- 0.1. The
switch hystereris is pH 0.1, and the control accuracy is +/- 0.1 (reference value). In order to ensure the accuracy of
measurement and therefore the control circuit, the Dupla Twin-Control pro provides an optional six-week calibration
memory function
Please note: If no pH electrode is connected to the Dupla Twin-Control pro, so that the BNC socket is open,
fictitious pH values will be displayed.
3.3.2 CO2-night off function
This enables interruption of the CO2supply, controlled by a magnetic valve, into your aquarium during the night if
desired. The beginning and end times of the interruption during the night can be choosen after programming the pH
Set point.
3.3.3 pH alarm programming
A visual alarm indicated by flashing if the temperature exceeds or drops below the programmed desired pH values.
The factory presetting is , which means no alarm. The alarm window can be set between a pH 0.1 and 4.0 deviati-
on from the set point.
3.3.4 Deactivation/activation of the audible pH alarm
The audible alarm can be switched or . The factory setting is , as otherwise an alarm could be trigge-
red immediately when the system is first put into service when the electrode is still located outside the aquarium or
not yet calibrated.
3.3.5 Calibrate pH electrode
The factory setting of the calibration points are pH 7, pH 4 and pH 9, the calibration sequence is first pH 7, then pH 4
or pH 9. The calibration process can be cancelled by pressing the ▲and ▼buttons simultaneously.
3.3.6 Reminder of calibration function
With this feature enabled, every six-weeks
CAL and flash on the display as a reminder to check the pH electrode
calibration. For a period of 10 seconds you will hear a beep every 2 seconds. This will be repeated every hour.
If you prefer not to carry out a calibration, the memory display clears after activating any button and reappears in
another 6 weeks.
In order to calibrate the pH electrode, enter programming mode by pressing the button and follow item 5.3.4 of
the instructions.
To disable of the calibration memory function, continue to scroll through the menu items and set the function to
.

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3.4 Temperature 2 programming
3.4.1 Choice of HEAT/COOL
A convenient inversion function makes it possible to switch from HEAT to COOL. This permits connection to an exter-
nal Cooling device instead of a Heater to counteract an increase in temperature.
3.4.2 Setting as second temperature
When slot 1 is programmed for temperature (water heating), then in HEAT mode the temperature 2 (substrate hea-
ting) on slot 2 is fixed to 0.1 °C higher.
Example: You have set the water temperature to 25.0 °C. When 25.0 °C is measured, slot 1 (water heating) is
switched off. The substrate heating remains active. If the substrate heating system is so powerful that 25.1 °C is
measured, slot 2 (substrate heating) is also switched off.
Hint: A warm substrate strengthens the roots of plants, encourages biological substrate activity and generates
a circulation in the substrate to improve the transport of oxygen and nutrients. This provides the best possible
conditions for healthy plant growth.
In COOL mode the temperature 2 (water cooling) on slot 2 is adjustable to a 0.1 and 5.0 °C difference to
temperature 1.
Example: You have set the temperatur 1 on slot 1 to a heating temperature of 25.0 °C and the difference of
temperatur 2 to temperature 1 for a cooling device on slot 2 to 3 °C. When a temperature less than 25.0 °C is
measured, water heating on slot 1 remains switched on, slot 2 switched off. When a temperature above 28.0 °C
is measured, water cooling on slot 2 is switched on, slot 1 is switched off.
Hint: Submersion tube heaters with a thermostat should be set 3 – 4 °C higher than the desired temperature to
ensure correct operation of electronic control via the Dupla Twin-Control.
3.4.3 Alarm setting temperature 2
A visual alarm indicated by flashing if the temperature exceeds or drops below the programmed desired tempe-
rature 2 values. The factory setting is (no alarm). An alarm window between +/- 0.1 °C and 10 °C can be set.
Example: Temperature 25 °C, alarm window +/- 3 °C means that an alarm is triggered below 22 °C and above 28 °C.
3.4.4 Deactivation/activation of the audible temperature 2 alarm
The audible alarm can be switched or . The factory setting is , as otherwise an alarm could be trigge-
red immediately when the system is first put into service when the sensor is located outside the aquarium, where the
temperature may be either too high or too low.
3.4.5 Setting as first temperature
In the case that switch number 1 is programmed as pH control, the temperature can be used for 2 optional water
heating or cooling.
3.5 Timer programming
3.5.1 Setting the timer control mode
As an alternative to temperature regulation, the second slot can be used to control external devices via a timer switch
with a one-second control interval. Selection is between (external device at slot 2 is permanently activated),
(automatic modus) and (interval mode).
3.5.2 Programme turn-on and turn-off times
If Automatic Mode is selected up to 8 turn-on/turn-off times can be programmed. (The Dupla Twin-Control has an
automatic sorting function which will re-arrange the time periods into the correct sequential order when exiting the
programming mode.)

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3.5.3 Programme interval control
If the Interval mode is selected external devices are switched on for a minimum of 1 second (maximum 23 hrs., 59
min. and 59 sec.) and switched off for a minimum of 30 minutes (maximum 96 hrs. and 59 min.).
3.6 Manual activation/deactivation
Both slots can be turned on and off manually by combination of buttons to be pressed.
3.7 Display light
Factory presetting is an automatic adaptation of the display light. After pressing any button the display light is
switched on. When no button has been pressed for 120 seconds, the display light is automatically dimmed down. It is
possible to change from automatic light dimming to full illumination of the display.
3. 8 Calibration of the temperature sensor
The temperature sensors has a tolerance of +/-0.5 °C. To compensate any possible deviation in comparence to an
external reference meter, a calibration is possible.

Twin-Control Main Menu
Clock
programming (5.1)
Temperature 1
programming
(5.2)
pH
programming
(5.3)
Temperature 2
programming
(5.4)
Timer
programming
(5.5)
Setting the
timer control mode
(5.5.1)
Either up to
8 ON / OFF times
or
interval
or
permanent ON
Setting as rst
temperature (5.4.5):
for heating Water
or cooling Water
or
Setting as second
temperature (5.4.2)
Water temperature
or Substrate temperature
Slot 1
programming:
Temperature 1
or pH
Slot 2
programming:
Temperature 2
or Timer
Time
setting (5.1.1)
Choice of
HEAT / COOL (5.4.1)
Choice of
HEAT / COOL (5.2.1)
Setting the temperature 1
control mode: (5.2.2)
Setting the temperature 1
value: (5.2.3)
Alarm setting
temperature 1 (5.2.4)
De-)activation of the audible
temperature 1 alarm (5.2.5)
CO2-Night
o function (5.3.2)
pH Alarm
programming (5.3.3)
(De-)activation of the
audible pH alarm (5.3.4)
pH Electrode
Calibration (5.3.5)
Calibration Reminder
Function (5.3.6)
Programming interval
control (5.5.3)
Programming
turn-on / turn-o times (5.5.2)
pH Set Point
Programming (5.3.1)
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4. Quick sStart guide to programming
Audible acknowledgment: Press a button briefly, i.e. a ‘tap’ = short sound. Hold a button down, i.e.
for 3 seconds = long sound.
Switching to programming mode: A) Pressing the button enters the main programming menu.
Moving within the main [sub] menu structure: B) With the ▲or ▼buttons you can scroll through the menu items. Short
pressing of acknowledges the selection which sub menu item to
access. As well in the sub menu structure you can scroll through the menu
items with the ▲or ▼buttons and you acknowledge a selection by short
pressing of .
Modifying programming: C) Pressing enables the modification of programmed values, the
changeable value flashes. D) Increase or decrease required values with the
▲or ▼button. E) Acknowledge by activating the button.
Quitting the submenu structure: F) By holding down the button for 3 seconds you switch from a
lower to a higher menu level.
Quitting the programming mode: G) After 90 seconds of inactivity you automatically access the operational
mode. From the main level you can access the operational mode as well by
holding down the button for 3 seconds. All changed values will be
saved.
Cancelation of programming: By pressing the ▲and ▼button simultaneously it is possible to quit the
programming mode at any time without saving.

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5. Programming instructions
To start the programming mode press the button
Please note: Without connected pH-elctrode the error will be displayed.
5.1 Clock programming
5.1.1 Time setting
Entering the programming mode, the clock symbo flashes.
Press the button, the hours digits flashes
Use the ▲or ▼button to set the hours between 0 and 23.
Press the button, the minutes digits flashes.
Use the ▲or ▼button to set the minutes between 0 and 59.
Press the button, the seconds digits flashes.
Use the ▲or ▼button to set the seconds between 0 and 59.
Acknowledge with the button.
When finished will flash again. To set the temperature 1 regulation on slot 1, scroll with the ▼button to the next
main menu item where Temp 1flashes, press and proceed with 5.2.
To set the alternative pH regulation on slot 1, press the ▼button again until pH flashes, press and proceed
with 5.3.
Please note: Once the clock has been set at least once, you can use ▲or ▼to access directly the settings
Temp 1,
pH , Temp 2or Time .
Caution: The Dupla Twin-Control pro does not automatically switch between summer time and winter time.
This change must be entered manually.

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5.2 Temperature 1 programming
Please note: Temperature1 is an alternative programming to pH control for slot 1.
5.2.1 Choice of HEAT / COOL
After confirming Temp 1, flashes. Confirm with to select HEAT operating mode ( : control of connected
heaters) or use ▲or ▼to select the COOL operating mode ( : control of connected cooling devices) and then
confirm with .
5.2.2 Setting the temperature 1 control mode
When SET flashes press for temperature setting and proceed from 5.2.3 or scroll with the ▼button to set the
alarm and proceed from 5.2.4 or (de)activate acoustic alarm ( ) and proceed from 5.2.5

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5.2.3 Setting the temperature 1 value
After confirming SET , flashes.
Press the button to programme position 1.
( can be selected using ▲or ▼)
When flashes, the ▲or ▼buttons can be used to select (change) or (delete).
If you want to select , press the button to confirm, the hours will flash.
Use the ▲or ▼button to set the hours between 0 and 23.
Press the button, the minutes digits will flash.
Use the ▲or ▼button to set the minutes between 0 and 59.
Press the button, the temperature or your last programmed value flashes.
Use the ▲or ▼button to set the desired temperature value between 10 °C and 40 °C and acknowledge with
button.
When flashes, you can programme a night time in the same manner by briefly pressing the button.
By long pressing the button you leave this sublevel programming point and access the next settings.
Please note: It is not possible to enter turn-off times. The start time of is the end time of . If only
is set, the programmed levels are maintained over 24 hour. It is advisable to programme two time periods
to differentiate day values and night values.
Caution: If starting times for and are identical, the error appears on the display.
5.2.4 Alarm setting temperature 1
When flashes press to set the alarm or scroll with the ▼button to (de)activate the acoustic alarm and
follow from 5.2.5.
After confirming with , flashes. Use the ▲or ▼button to set the +/- alarm between 0.1 °C and 10 °C.
Press the button to confirm.
Advice: means that no alarm is set.

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5.2.5 Deactivation/activation of the audible temperature 1 alarm
When flashes press . After confirming flashes. Use the ▲or ▼button to activate the alarm with
or to deactivate it by selecting and acknowledge with .
When SET flashes again, press and hold for 3 seconds to leave the programming sublevel.
When Temp 1flashes again, scroll with the ▼button to the main menu item where Temp 2flashes and proceed
with 5.4. To set the alternative timer switch on slot 2, scroll with the ▲button to the main menu item where Time
flashes, press and proceed with 5.5.
Please note: Do not proceed with
pH as this will overwrite the slot 1 programming for temperature control
that you have just finished.

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5.3 pH programming
Please note: pH control is an alternative programming process to temperature 1 for slot 1.
Entering the programming mode,
pH is displayed and SET flashes.
If you want to programme the pH Set point, press . Proceed making your settings with item 5.3.1 of the instruc-
tions.
If you want to activate the night off function press another time the ▼, button until flashes and confirm by
pressing the button. Continue making your settings with item 5.3.2 of this instructions.
If you want to programme the pH alarm, press the ▼button again until the alarm clock flashes and confirm by pres-
sing the button. Proceed making your settings with item 5.3.3 of the instructions.
If you want to calibrate your pH-Electrode, press the ▼button to select
CAL and confirm by pressing the
button. Proceed making your settings with item 5.3.5 of the instructions.
5.3.1 pH set point programming
When or your last set value and pH are flashing, press the button to set the pH point.
When flashes, press the button to confirm.
or your last programmed value will flash.
Please note: The pH Set Point presetting is . Depending on water values where your fish come from, higher
or lower values could be required.
When or your last set value flashes,use the ▲or ▼button to set the desired pH value between and , and
acknowledge with .
When the pH Set Point Programming is finished, is flashing.

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If you want to activate the CO2-night off function and don´t wish to supply CO2during the night, press . Conti-
nue making your settings with item 5.3.2 of this instructions.
If you want to keep the manufacturers presetting of the CO2-night off function and wish to supply CO2during the
night, skip the menu item 5.3.2. To do that press – during is flashing - the ▼key until flashes, acknow-
ledge with Taste and continue with programming the pH Alarm with item 5.3.3 of this instructions.
5.3.2 CO2-night off function
After you have acknowledged flashing with , is flashing and pH is displayed in first line,
is displayed in the thrid line. Now use the ▲and ▼buttons to change into and acknowledge
with .
Please note: In case flashing is acknowledged with , you directly access pH Alarm programming,
indicated by flashing .
Next is flashing. The ▲and ▼buttons can be used to select (change) or (delete). If is selected,
press the button to confirm.
When is flashing, press to confirm.
in the third line is displayed and the hour digits (or your last programmed value) will flash.
Use the ▲and ▼buttons to set the start hours for not supplying CO2in the night between 0 and 23.
Press the button, the minutes digits will flash.
Use the ▲and ▼buttons to set minutes between 0 and 59 and acknowledge with .
Attention: Here is the time when the stop of CO2supply should beginn, for example at 21.00 when your
lighting is switched off.
in the third line is displayed and the hour digits (or your last programmed value) will flash.
Use the ▲and ▼ buttons to set the off time hours for CO2supply stop in the night.
Press the button, the minutes digits will flash.
Use the ▲and ▼buttons to set minutes between 0 and 59 and acknowledge with .
Attention: Here is the time when the stop of CO2supply should end, for example at 8.00 when your
lighting is switched on.
Please note: When the night off beginning time is reached the display shows a measured but not regulated
pH value in the first line. In the third line for the set value a is displayed.
When the night off function programming is finished, is flashing and you can go on with pH Alarm programming.

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5.3.3 pH alarm programming
When flashing is acknowledged with , or your last programmed value flashes.
Use the ▲and ▼buttons to set the +/- alarm between 0.1 and 4 pH. Acknowledge with
Advice: means that the alarm has not been set.
When the pH Alarm programming is finished, flashes.
5.3.4 Deactivation/activation of the audible pH alarm
When flashes, press to (de)activate the audible alarm
When flashes acknowledge with to deactivate the pH alarm.
Alternatively use the ▲and ▼buttons until flashes and acknowledge with to activate the pH alarm.
Hint: The audible alarm for pH and calibration reminder can not be separated. If you deactivate the audible pH
alarm the audible calibration reminder alarm is deactivated as well.

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5.3.5 pH electrode calibration
When CAL flashes, press . flashes on the second line.
1. Remove the protective cap from the electrode tip.
2. Rinse electrode tip briefly with DuplaDest.
3. Dip the electrode into the pH 7 solution and press .
A measured running value is displayed together with
CAL and pH on the first line,
while and
SET are displayed on the second line.
When the measured running value has settled, press the button for three seconds – until you hear a long beep
as confirmation as value acceptance.
is displayed with CAL on the first line and with SET on the second line.
4. Take the elctrode out of the pH 7 solution and press to proceed calibration.
flashes on the second line.
5. Rinse the electrode tip briefly with DuplaDest.
6. To calibrate the pH Electrode for freshwater aquaria, dip the electrode into the pH 4 solution for freshwater and
acknowledge with
(To calibrate the pH Electrode for saltwater aquaria, use the ▲or ▼button until flashes, dip the electrode
into the pH 9 solution for saltwater and acknowledge with )
7. A measured running value is displayed together with
pH and CAL on the first line, ( ) with SET is displa-
yed on the second line.
When the measured running value has settled, press the button for three seconds – until you hear a long
beep as confirmation as value acceptance.
Press to finish calibration. When the calibration is finished,
CAL and are flashing.
8. Rinse the electrode tip briefly with DuplaDest.
9. Fix the electrode in the aquarium with suction cups.
Please note: The calibration can be interrupted at any time by pressing the ▲or ▼button at the same time.
Caution: Used electrodes which top has been dried completly in the protection cover need to be put in water
over night before the calibration is done. New electrodes need a 14 days run-in period. After that a second
calibration is necessary for precise mesurement.

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5.3.6 Calibration reminder function
The factory presetting is an activated visual calibration reminder alarm.
If you want to keep it, press for 3 seconds when
CAL and are flashing to leave the programming sublevel.
If you want to deactivate the calibration reminder, select with the ▲or ▼button and acknowledge with .
When SET flashes again, press three seconds to leave the sub sub level.
When
pH flashes again scroll with the ▼buttons to Temp 2or Time to proceed programmation or press for 3
seconds to return to operating mode.
Advice: The audible alarm for pH and calibration reminder can not be separated. If the audible pH alarm is
deactivated, the audible calibration reminder alarm is deactivated as well. The optical alarm is not affected from
that.