The moisture sensors 60 are connected to {HEAD ~ a controller} 62, which monitors {TAIL ~ the moisture content} in the atmosphere 
monitors
The moisture sensors 60 are connected to { HEAD ~ a controller } 62 , which monitors { TAIL ~ the moisture content } in the atmosphere
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH