5
3.2 pH Set Point
The pH set point can be adjusted within the limits of 4.0 - 9.9. If the measu-
red pH value is outside the display range, values lower than 4.0 are displayed
as LO, values higher than 9.9 are displayed as HI. Outside of these limits, the
pH channel is switched off. The pH-controlled CO² fertilisation is carried out
through permanent measuring by a connected pH electrode and switching of a
connected CO² magnetic valve with a switch hysteresis (the difference between
the switching point and the triggering point) of 0.1 and a control accuracy
is +/- 0.1. The switch hystereris is pH 0.1, the control accuracy is +/- 0.1
(reference value).
Please note:
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.
3.3 CO²-Night off function
This enables to stop supplying CO², controlled by a magnetic valve, into your
aquarium during the night if desired.
3.4 pH Alarm
When the programmed pH set-point is either not met or exceeded, the
flashing LED light indicates an alarm. The alarm window can be set between
0.1 and 4.0 deviation from the set point. By default, a deviation of pH 0.5 is
preset. The alarm function can be disabled by setting 0.0.
3.5 pH Electrode Calibration
The factory setting of the calibration points are pH 7, pH 4 and pH 9, the
calibration sequence first is pH 7, then pH 4 or alternatively pH 9. The
calibration process can be cancelled by pressing the
and
button
simultaneously.
3.6 Reminder of Calibration Function
With this feature enabled, every six-weeks the LED light and
on the display
