Hi All
i have read though the forum , but cant seem to find the right answer
i have a profilux 3 ex
firmware version 5.15
i wanted to know if it was possible to do a water change using one optical sensor
the reason for my question , is that i manually drain my tank during water change to vacuum any areas where i find there may be detritis
i have mounted the sensor at the tanks constant water level, so while it is running the sensor doesnt get activated .
want i want to do is
drain the tank , while cleaning (this will trigger the sensor), once completed (after a set amount of time), the triggered sensor will activate a switch , that will be connected to a pump with new salt water
obviously once the tank starts to drain , the sensor will be activated , and therefore trigger a switch.
the problem i have , is that i will need about 15 to 20 minutes to drain the tank before i want the switch to trigger.
do i need to fit another sensor , at the bottom , where the water will eventullay drop to , in order to trigger the pump , or can i only use one
i know sensor have a built in maximum reaction delay of about 240 seconds , but this is obviously not enough
thanks in advance to all who assist
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