A set up circuit is coupled to sensor, {TAIL ~ the power source}, and {HEAD ~ the wire feeder} 
A set up circuit is coupled to sensor , { TAIL ~ the power source } , and { HEAD ~ the wire feeder }
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD