Dupla pH-Control Pro Gebruiksaanwijzing - Pagina 7

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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

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 .) .

Both slots can be turned on and off manually by combination of buttons to be pressed .

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 .