The OSI-RE-SS is usually a reflector- variety linear optical beam smoke detector made to work like a component of hearth alarm systems. The beam operates totally on the principle of light obscuration utilising an Infra-Pink beam. OSI-R-SS is usually a 4-wire conventional reflector-style linear optical beam smoke detector for use https://bookmarking1.com/story18551728/a-review-of-conventional-beam-detectors