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