The OSI-RE-SS is a reflector- variety linear optical beam smoke detector made to work like a ingredient of fire alarm devices. The beam operates primarily on the theory of light obscuration utilising an Infra-Crimson beam. OSI-R-SS is really a four-wire conventional reflector-type linear optical beam smoke detector for use in https://tvsocialnews.com/story4025112/top-latest-five-conventional-beam-detectors-urban-news