The 6424 Beam Detector is designed to give full protection to high, open areas in which the effectiveness of conventional point type detectors is reduced. Operating on the obscuration principle, the 6424 is capable of detecting a wide range of fire types from slow smouldering to fast flaming fires. The beam detector consists of a separate transmitter and receiver units which are mounted on opposite sides of the area to be protected - maximum distance 100m. An infra-red light beam is projected from the transmitter to the receiver which, in turn, monitors the intensity of the light signal. Smoke entering the beam path reduces the intensity of the signal and an alarm will be raised when the level reaches the pre-set alarm threshold. The 6424 utilises microprocessor technology to both simplify the installation and increase overall system reliability. Alignment of the unit is facilitated by four LED indicators which show the received signal strength, thereby eliminating the need for special tools or meters. Fire and Fault relays are provided for connection to the fire alarm panel. Both transmitter and receiver are supplied with wall and ceiling mounting brackets giving a wide range of adjustment.

• 10m -100m range - up to 1500m2 coverage • Alignment LEDs simplifying installation • Automatic gain control compensating for drift in signal level • Voltage free alarm and fault contacts • Ceiling or wall mounted. • Designed to comply with BS 5839: Part 5, 1988

Mechanical Weight Receiver 0.66Kg Transmitter 0.6 Kg Operating Temperature -30 to 55°C Humidity (max) 95% RH (non-condensing) electrical Sensitivity 1.5dB obscuration (30%) or 3.5dB obsuration (55%) Receiver Operating voltage 20 - 32 Vdc Quiescent current 10mA (+24Vdc) Alarm/Fault current 29mA (+24Vdc) Contact rating 2A 30V (AC or DC) Transmitter Operating Voltage 18.8 - 32Vdc Quiescent current 10mA (+24Vdc)