When a sensor detects a significant change in air flow and air pressure, {HEAD ~ a detection signal} is analyzed by {TAIL ~ a controller unit microprocessor} for comparisons with a preselected operating range for air flow and pressure 
is analyzed by
When a sensor detects a significant change in air flow and air pressure , { HEAD ~ a detection signal } is analyzed by { TAIL ~ a controller unit microprocessor } for comparisons with a preselected operating range for air flow and pressure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH