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