Silent Knight OSI-RI-SK


Intelligent Beam Detector

Availability: In Stock

  • Factory New
Brand: Silent Knight Part #: 81140 Category: Manufacturer Part #: OSI-RI-SK


The OSI-RI-SK intelligent addressable reflector-type linear optical beam smoke detector is uniquely suited for protecting large open areas with high ceilings where spot-type smoke detectors are difficult to install and maintain. Ideal applications are warehouses, malls, aircraft hangers, arenas and concert halls. The beam operates primarily on the principle of light obscuration using infrared. The OSI-RI-SK detector is a combined transmitter/receiver and is compatible with Silent Knight Addressable Fire Alarm Control Panels.


Weight 3.91 lbs
Dimensions 4.50 × 10.0 × 6.00 in

Silent Knight



Production Status



  • Combined transmitter/receiver unit
  • Wide 12° field of view
  • Fast, easy, and intuitive beam alignment indicated by LED directional arrows
  • 50° horizontal and 20° vertical beam adjustment
  • Long range coverage of 16-328 ft (5-100m) is standard; no separate long-range kit required
  • Automatic sensitivity threshold level setting
  • Resistant to building movement; tolerates +/- 1° movement
  • Resistant to strong light sources; does not alarm when saturated by sunlight
  • Resistant to solid object intrusion
  • Remote test station capable for electronic simulated smoke test from ground level
  • Status LED indicators visible from the front and bottom
  • Automatic drift compensation
  • Paintable housing/cover
  • Built-in imager heater
  • Optional reflector heater kit available


OSI-RI-SK; Intelligent Single-ended Reflective Imaging Beam Smoke Detector
Silent Knight – Data Sheet