Here is our case study of the Fireray One Optical Beam Smoke Detection installed throughout Ripon Cathedral - as part of a larger fire detection & fire alarm installation.
Reflected Optical Beam Smoke Detectors (OBSD) consist of a transceiver (a transmitter & receiver) unit that projects, monitors, and receives a beam
reflected across the protected area.
OBSD's operate on the principle of obscuration. As a smoke field develops, the detector senses the cumulative obscuration.
The percentage of light blockage created by
a combination of smoke density and the linear distance of the smoke field across the projected light beam, will activate an alarm condition.
Transmitter & Receiver OBSD works by sending an invisible infra-red (IR) beam of light across the area being protected. If smoke is present in the air, this obscures the light received by the receiver, reducing the IR light level to a set level, which then triggers an alarm condition.