The OSI-RE-SS is usually a reflector- type linear optical beam smoke detector made to operate as being a component of fire alarm units. The beam operates totally on the theory of light obscuration utilising an Infra-Crimson beam. OSI-R-SS is often a four-wire conventional reflector-sort linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/