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System Sensor Europe, like the majority of manufacturers, is experiencing longer product lead times due to component shortages. As we actively work to improve this situation, your satisfaction remains our main priority. View our current estimated lead times.

Conventional Beam Detectors

The OSI-RE-SS is a 4-wire, single-ended, reflected type beam smoke detector that includes an 8″ reflector and an integral sensitivity test.


The OSI-RE-SS is a reflector- type linear optical beam smoke detector designed to operate as a component of fire alarm systems. The beam operates primarily on the principle of light obscuration utilising an Infra-Red beam. Optical beam smoke detectors are particularly appropriate for protecting buildings with large open spaces such as warehouses, atriums etc.
The OSI-RE-SS detector is a combined transmitter/receiver unit that can be directly connected to a conventional detector circuit.


  • Combined transmitter and receiver unit, range 5-100 m (16-328 ft)
  • Conventional model
  • Receiver consists of a CMOS imaging CCD
  • Wide 12° field of view
  • Intuitive beam alignment indicated by directional arrows
  • Single IR wavelength
  • Highly resistant to building movement; tolerates +/- 1° movement
  • Resistant to strong light sources; does not alarm when saturated by sun
  • Resistant to large solid intruding objects
  • Automatic sensitivity threshold level setting
  • 50° horizontal and 20° vertical beam alignment
  • Built-in heater
  • Electronic simulated smoke test from ground level
  • Standby, fault and alarm LED indicators visible from the front and bottom
  • Automatic drift compensation
  • Paintable cover
  • Removable plug-in terminal blocks
  • Optional heater kit available for the reflector