The OSI-RE-SS is actually a reflector- variety linear optical beam smoke detector built to work to be a ingredient of fireplace alarm units. The beam operates totally on the basic principle of sunshine obscuration utilising an Infra-Pink beam. OSI-R-SS is really a 4-wire conventional reflector-kind linear optical beam smoke detector https://letsbookmarkit.com/story18521411/new-step-by-step-map-for-conventional-beam-detectors