
Your Local Authority Having Jurisdiction (AHJ) should always be consulted before beginning the installation of any fire alarm system. 2.0 Glossary of Terms Beam Smoke Detector (Projected Beam Smoke Detector) A device which senses smoke or smoke and heat by projecting a light beam from a transmitter across the protected area to a receiver that monitors the light signal. Smoke and/or heat entering the beam path will decrease the light signal causing an alarm. Detector Coverage The area in which a