The OSI-RE-SS can be a reflector- variety linear optical beam smoke detector intended to function as being a ingredient of hearth alarm methods. The beam operates totally on the theory of light obscuration utilising an Infra-Pink beam. OSI-R-SS is usually a 4-wire conventional reflector-form linear optical beam smoke detector for https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/