Push in and rotate cylinder valve knob clockwise to close. When cylinder valve is fully closed, open purge valve slightly to vent residual air pressure from system. As the residual air pressure vent from the system, the remote pressure gauge needle will swing from “FULL” and move to wards “EMPTY” band (see Figure 3). The VIBRALERT end of the service indicator alarm shall actuate. The Bell end of service indicator alarm shall ring one or more time. The Beacon Alarm, if installed, shall begin flashing. After verifying that all alarms are functioning (rapid clicking of the VIBRALERT Alarm, slow deliberate single bell strikes of the Bell Alarm, and, if installed, flashes of red light for the Beacon Alarm) open the purge valve slightly to vent the remaining residual air pressure from the system. All alarm shall cease operation when the system pressure drops to zero. When air flow stops completely, return purge valve to the fully closed position (pointer on knob upward)