ok I got the sensors today. Here is the deal:
Those are these sensors here:
http://www.gemssensors.com/pdf/IOM_B...s/RFS-2500.pdf
They have 5 wires coming out 2 for power (12 VDC)
1 more is common and the other 2 are signals wires
1 Normally Closed (closes the loop between it and common when there is a set amout of flow)
1 Normally Open (opens the loop between it and common when there is a set amout of flow)
1 pot on the back that adjusts the amount of flow that will trigger the NC to open and NO to close
also an LED in the back that lights up when the threshold flow is reached.
oh yea they are $150 each got all 6 (one is 24 volt) for really cheap.