PAS (Personal Alarm System) is an ultrasonic emergency notification / communication system.  The exact location of an individual moving throughout a facility is immediately determined when he or she activates their Personal Alarm Transmitter (PAT) device.  Through integration with an overall security management system, the location of the individual requiring assistance can be graphically represented on a map-type display at a central location.  One or more receivers are installed in each room or hallway that the system is required to cover.  A microphone on the receiver can forward audio to the central control. Video Library PAS   Life Safety Emergency Call Video         Application PAS transmitters are discreet, compact and rugged and can be worn on the belt either with a belt clip or in a holster, or as a pendant.  Transmitter activation can be through: button press, pull-pin, pendant pull-ring or self activation in a man down situation.  Receivers are flush mounted in the wall or ceiling and provide an alarm output, auxiliary alarm output, audio and a visible LED that illuminates to indicate that an alarm has been received.     How it works Unlike radio signals (RF), ultrasonic signals do not penetrate walls, ceilings or floors. Therefore, the transmission / reception is confined to the immediate area of the transmitter and there is no confusion regarding where response should be sent. PAS is based on ultrasonic technology to ensure that location identification is accurate since there is no “bleeding” of signal between walls or floors. The ultrasonic transmission is modulated and receivers will only alarm when they receive a transmission containing two set frequencies in an established pattern. This eliminates false alarms from items such as keys, metallic items, HVAC systems as it is extremely unlikely for the same modulated frequency pattern to be duplicated. Upon activation, the transmitter carried by an individual emits a continuous ultrasonic signal. The signal is omni-directional, eliminating the need to point or direct the transmission.        Documentation