The set up circuit automatically sets up the welding machine in {HEAD ~ response} to {TAIL ~ the sensor} 
The set up circuit automatically sets up the welding machine in { HEAD ~ response } to { TAIL ~ the sensor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL