Encyclopedia & FAQ's

DIY Frequently Asked Questions / Photoelectric Fire Detector


  • DIY Frequently Asked Questions / Photoelectric Fire Detector')"> Uses a small lamp adjusted to direct a narrow light beam across the detection chamber. Smoke entering the chamber scatters this light beam, causing it to hit a sensor and set off the alarm.
  • Usually more sensitive to smoke from a slow, smoldering fire than an ionization detector, but reacts less quickly to flaming fires.
  • Available in both battery-operated and plug-in versions.