7
3.2.6 Calibration reminder 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 5.2.4 of
the instructions.
To disable of the calibration memory function, continue to scroll through the menu items and set the function to
.
3.3 Timer programming
3.3.1 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).
3.3.2 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 pH-Control Pro has
an automatic sorting function which will re-arrange the time periods into the correct sequential order when exiting
programming mode.)
3.3.3 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.).
3.4 Manual activation/deactivation
Both slots can be turned on and off manually by combination of buttons to be pressed.
3.5 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.
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