If the detection signal is outside the preselected range of air pressure, the controller unit transmits an alert signal to {TAIL ~ a transmitter} means for remote transmission of {HEAD ~ an alarm signal} to an alarm means 
If the detection signal is outside the preselected range of air pressure , the controller unit transmits an alert signal to { TAIL ~ a transmitter } means for remote transmission of { HEAD ~ an alarm signal } to an alarm means
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH