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