System Sensor OSI-R-SS 4-Wire Reflected Beam Smoke Detector with 8-Inch Reflector

A 4-wire conventional, reflector-type linear optical beam smoke detector designed for fire alarm systems in large, open spaces with high ceilings, such as warehouses and atriums. Its infrared beam detects smoke through light obscuration, while the combined transmitter and receiver connect directly to a conventional detector circuit. Single-ended wiring means only one side of the installation requires wiring.

Directional LED crosshair arrows make beam alignment fast and intuitive. The detector offers a 12° field of view and standard coverage from 5–100 m (16–328 ft), with no separate long-range kit required. Automatic sensitivity threshold setting, resistance to building movement and solid-object intrusion, and operation without alarming when saturated by sunlight support dependable performance. The beam can be adjusted 50° horizontally and 20° vertically, and a built-in imager heater is included.