Dupla pH-Control Pro - 3 Description of the Programmable Functions; Clock Programming; Time Setting; Ph Programming

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3. Description of the programmable functions
Slot 1 can only be programmed for pH control. Slot 2 can only be programmed for timer switch. 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 pH programming
3.2.1 pH set point
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 CO
2
fertilisation is carried out through permanent measuring by a
connected Dupla pH electrode and switching of a connected Dupla CO
2
magnetic 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. Switch
hystereris (the difference between the switching point and the triggering point) 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
pH-Control Pro provides an optional six-week calibration memory function.
Caution: If no pH electrode is connected to the Dupla pH-Control Pro, so that the BNC socket is open, fictitious
pH values will be displayed.
3.2.2 CO
2
night function
This enables interruption of the supply of CO
2
, 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.
3.2.3 pH alarm
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.
3.2.4 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.
3.2.5 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 alternatively pH 9. The calibration process can be cancelled by pressing the ▲ and ▼ buttons simultaneously.