Many thanks to Lorin from canada for supplying this important information.
OK here is a tutorial on how to do a Automatic Water Change also know as AWC.
Hardware requires:
Profilux Plus II
1 sensor splitter
2 level sensor
3 pumps.
First install both sensor in the desired locations
1st sensor should at the level that you desire to keep your aquarium.
2nd sensor need to be install lower than the first sensor.
HINT: The second sensor is what will stop the pump from discarding water the old water from your aquarium to the drain.
Suggestion: Get a bucket that matches what you want to change, then fill it up with the pump you just install. Pump manually (plug in wall) the old water out that will allow you to know 3 very important thing will come out of this exercise.
1st the amout being change
2nd the time it takes to remove the quantity you want, so that you can set your "max on-time" to avoid disasters.
3rd It will indicate where to install your 2nd sensor, when installing the second sensor, set your profilux in diagnostic mode under the level menu.
Here is how to get to the diagnostic menu.
Now if you have done it according to my suggestion the sensors should read like this: 1- 2- 3-.
Now let start doing to programmation for the profilux side.
1st lets do the programmable logic for the AWC.
You will need to create to 2 programmable logic, for this purpose.
One is used for the day-to-day "Automatic Top-Off" aka ATO.
the other one is used only the case off a water change
Programmable Logic 1
Input 1 = Water 1
Input 2 = Water change (inverted)
Function AND
Programmable Logic 2
Input 1 = Water 1
Input 2 = Water change
Function AND
Programmable logic part is done
Level Menu
Now in this menu we need to configure the level sensor function.
Level 1 need to be set to 'ATO & Water Change'
And level 2 NEEDS to be set 'not enabled' otherwise the AWC will not work.
The max on-time is a very important feature to configure it avoid disasters.
If you have followed my suggestion in post 1 you will now know how much time it take to purge your old water from your tanks and set this as your max on-time (add 1 minutes)
As seen in the picture below, it takes about 3 minutes to purge my old water from my system.
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