Projected Beam Smoke Detectors
The Transmitter (T) and the Receiver (R) are installed at each end of the area to be protected, up to 100metres apart. The Receiver is electrically connected to a Control Unit, the latter being installed at the ground level.
Projected Optical Beam Smoke Detectors are less susceptible to stray reflection as reflections go back to the Transmitter. As a result, Projected Optical Beam Smoke Detectors can operate within narrower gaps left in the operating environment. In addition, Projected Optical Beam Smoke Detector Transmitter and Receiver units are generally compact and easily adopted into “aesthetic” architectural designs.
Reflective Beam Smoke Detectors
The Transmitter (T) and the Receiver (R) are contained within one unit: the Transceiver (TR). The transmitted infrared light beam is reflected back by a reflector (prism) mounted directly opposite this unit, up to 100metres away. The Receiver is connected to a Control Unit that can be either integrated into the Transceiver or installed at ground level.
Reflected Optical Beam Smoke Detectors utilises less wiring for reduced installation costs (power and wiring are only required at the Transceiver end) and only requires the Transceiver to be aligned. However the Reflected Optical Beam Smoke Detector can be vulnerable to reflective items close to the IR beam path. As the Reflector has a wide acceptance angle, it does not need to be aligned as accurately as both ends of a Projected Optical Beam Smoke Detector.