The OSI-RE-SS is actually a reflector- sort linear optical beam smoke detector made to operate to be a part of fire alarm systems. The beam operates totally on the theory of light obscuration utilising an Infra-Pink beam. OSI-R-SS is often a four-wire conventional reflector-sort linear optical beam smoke detector for https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/