The OSI-RE-SS is actually a reflector- form linear optical beam smoke detector made to function for a component of fire alarm programs. The beam operates totally on the basic principle of light obscuration utilising an Infra-Crimson beam. Beam smoke detectors is often a significant ingredient of a effectively-intended computerized fire https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/