Conventional Duct Detector


Conventional Optical Duct Smoke Detector

This Conventional Duct Smoke Detector houses smoke sensor for monitoring the level of smoke in its surveillance. It switch to alarm state, when the level of smoke in the air stream of duct work sections of the HV AC air handling system.
Exclusive Features
  • Wide operating voltage
  • Low standby current
  • Drift compensation technique for false alarm immunity
  • Insect-resistant screening
  • Easy to maintain/service
  • Dual bi-color LED indication for 360° viewing angle
Technical Summary

Electrical Specifications
Operating voltage : Nominal 12/24V DC
                                   Minimum 9V DC
                                   Maximum 26V DC
Quiescent current : 50µA
Alarm current : 25 mA at 24V
                            12 mA at 12V

Normal : Green LED(Blinks every 8 sec)
Alarm : Red LED(Glows Steady)
General Specifications
Smoke sensitivity : 1+/ - 0.5 %obs/ft
Operating temperature : 0ºC to 49ºC
Storage temperature : 5ºC to 40ºC
Humidity : 0-95% RH(Non-condensing)
Color : White
Cycle Time : 4 sec
Contact Clamp : Stainless steel
Housing Material : 16 Gauge Cold Rolled sheet
Detector Housing : Polycarbonate
Back Box : Black Matte
Front Cover : Acrylic sheet
Mechanical Specifications
Dimensions(LxBxD) : 155x150x150mm
Sampling Tube : 205mm
Exhausted Tube : 220mm
Without Base : 1710g
With Base : 1820g
Know More

What is a smoke detector and how does it work?

Smoke detector is a measuring instrument that measures the level of smoke in its surveillance. It will raise an alarm only when the level of smoke exceeds its pre-set upper limit/threshold values.

Photoelectric/Optical Smoke detector work on a common light scattering principle. Smoke detector contains a chamber that consists of a light emitter usually a LED and a light a sensitive device like a photodiode that receives all the light directly emitted by the LED.

When the smoke enters the chamber, the intensity of light received by the photodiode reduces due to density of smoke. If the intensity of received light drops below a pre-set threshold level, fire alarm is triggered confirming fire. 

Unit of measure for level of smoke is Obscuration/foot (Obs/ft).

Photoelectric smoke detectors are highly sensitive to visual particles of smoke and also respond quickly to smouldering fires.

Addressable smoke detectors are wired using 2*1.5 sqmm copper cables from control panel.

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