The OSI-RE-SS is usually a reflector- form linear optical beam smoke detector created to work like a component of hearth alarm systems. The beam operates totally on the basic principle of light obscuration utilising an Infra-Pink beam. OSI-R-SS can be a four-wire conventional reflector-variety linear optical beam smoke detector to https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/