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