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onto the flow-sensor you'll find the meaning of the pins 
Quoted from "lucky777"
If you loock very carefullyonto the flow-sensor you'll find the meaning of the pins
But anyway, the middle pin is the signal pin, and if you hold the sensor, the cooling in/output point's at you, the left one ist the power (+4,5V to +24 V) and the right one ist the GND (-).
Hopefully this is what you wanted to know. ;D
If you'll use a different kind of flow-sensor which AC recommend ( see at onlineshop ) then I have no idea how the pins are set. But you can measure this out via the resistance of the pins !!![]()

[img]http://seti.familie-friedrich.de/userstats.php?l=6&id=884[/img] 
[img]http://seti.familie-friedrich.de/userstats.php?l=6&id=884[/img]
Quoted from "Dragonclaw"
conector "Flow"
Pin 1 (right): signal (on the sensorpictur above: #, right)
Pin 2 (middle): +5V (sensor: +, left)
Pin 3 (left): ground (sensor -, middle)
[img]http://seti.familie-friedrich.de/userstats.php?l=6&id=884[/img]
Quoted from "Dragonclaw"
no problem, but wait with saying thank you until it works![]()
[img]http://seti.familie-friedrich.de/userstats.php?l=6&id=884[/img]
Quoted from "Shoggy"
That's the wiring on my system and it works![]()
[img]http://seti.familie-friedrich.de/userstats.php?l=6&id=884[/img]
Quoted from "Fragom"
Ok, that connection is agreement with what above said but the Pin1 of the Aquaero is in right interest: the sequency is 3 - 2 - 1, ok?
[img]http://seti.familie-friedrich.de/userstats.php?l=6&id=884[/img] -