In the event that {HEAD ~ the sensed temperature} exceeds a dangerously high level, {TAIL ~ the circuit} energizes an audible alarm 
In the event that { HEAD ~ the sensed temperature } exceeds a dangerously high level , { TAIL ~ the circuit } energizes an audible alarm
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH