The sensor and {TAIL ~ electrical circuit} are mounted within a housing adapted for mounting to {HEAD ~ a mounting surface} 
The sensor and { TAIL ~ electrical circuit } are mounted within a housing adapted for mounting to { HEAD ~ a mounting surface }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD