New Fairfield Volunteer Fire Department members did some routine upkeep on equipment this week.  Firefighters changed the batteries in their Self Contained Breathing Apparatus PASS device.  The Personal Alert Safety System or Distress Signal Unit is primarily used by firefighters entering a hazardous environment such as a burning building.  The loud alert notifies others in the area that the firefighter is in distress. PASS device is integrated into an SCBA unit. It is connected by a hose to the air circuit and arms automatically when the air circuit is opened.