photoelectric smoke detector meaning

  "photoelectric smoke detector" in a sentence
  • [Architecture]

    A sensor used to initiate a fire alarm when smoke reduces the light received by a photoelectric cell in a device containing a light source; most effective in the early detection of fires in the smoldering stage.

  • [Electronics]
    A smoke detector in which a photocell, photodiode, phototransistor, or phototube is excited by a light beam passing through the air. The cell output current decreases when smoke fills the air. This current change trips an alarm or deflects an indicating meter when the density of the smoke exceeds a prescribed level.


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  1. obscuration-type photoelectric smoke detector
  2. psd : photoelectric smoke detector
  3. Photoelectric smoke detectors respond faster to fire in its early, smouldering stage ( before it breaks into flame ).
  4. Photoelectric smoke detectors typically respond faster to a fire in its early, smoldering stage  before the source of the fire bursts into flames ."
  5. Also, ionization detectors are weaker in high air-flow environments, and because of this, the photoelectric smoke detector is more reliable for detecting smoke in both the smoldering and flaming stages of a fire.

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