The smoke detector detects fire by the scattering of an infrared beam, which circuits are considered an infrared beam emitter and receiver.  The emitting and receiving lens are in the optical sensing chamber, screening and interference from outside lights, without preventing the entrance of smoke particles. In a smokeless condition, it only receives very weak infrared light. When smoke particles enter the chamber, the received light signal will increase due to scattering. When the smoke reached the predetermined density, it will trigger an alarm signal.


The DET-C631 optical smoke detector can combine with the standard base of model DB-6.


  • Wide operating voltage for both Fire & Security Systems
  • Error-free non-polarized zone input termination
  • Optional Detector Head locking mechanism incorporated
  • Twin color LED indicator, with "Green" (blinking) for Normal Operation, and "Red" for Alarm Status
  • LPCB Approved

Technical Specifications

  • Normal Rated Voltage: 24VDC
  • Operating Voltage: 9.6VDC to 30VDC
  • Quiescent Current: ≤65uA
  • Alarm Current: 18 to 22 mA (typical 20mA)
  • Remote LED Drive Current Output: Max. 20mA
  • Maximum Air Velocity: 7.6m/s
  • Weight: 102g (160g with Base DB-6)
  • Operating Temp. Range: -10℃ to +50℃
  • Relative Humidity: 95%RH, Non condensing @ 40℃
  • Alarm LED Indication: Red (Continuous)
  • Normal LED Indication: Green (Blinking)
  • Ingress Protection: IP42
  • Material of Body: ABS Plastic (To UL94V-0 Flammability Test Standards)
  • Colour of Body: White
  • Standards: EN54-7

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