Hi all

A colleague of mine is trying to troubleshoot a problem with a water
reclamation system at his GF's.

He is thinking that the level sensor might be shot in the water tank and
therefore the control board never gets a full signal or runs the
delivery pump.

The cable connecting the control board to the sensor is a four core with
colours red, blue, green and yellow.

Has anyone any experience of these systems to know what job each core is
doing?
He is thinking that one pair is power and the other a 4-20mA signal.
Does that sound likely?
If so, would it be red/blue for power and green/yellow for signal?

We have appropriated a fluke tester to try to diagnose the problem which
can simulate the 4-20 from the sensor.

Any pointers gratefully received.

Thanks

Phil