A controller unit receives and verifies whether {HEAD ~ the detection signal} is within, or is outside of, {TAIL ~ a preselected range} of air pressure 
is outside of
A controller unit receives and verifies whether { HEAD ~ the detection signal } is within , or is outside of , { TAIL ~ a preselected range } of air pressure
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH