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