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  2. Smoke detector - Wikipedia

    en.wikipedia.org/wiki/Smoke_detector

    Smoke detector mounted on a ceiling Knowing this sound could save your life - it means replace the battery. A smoke detector is a device that senses smoke, typically as an indicator of fire. Smoke detectors/Alarms are usually housed in plastic enclosures, typically shaped like a disk about 125 millimetres (5 in) in diameter and 25 millimetres ...

  3. Ringelmann scale - Wikipedia

    en.wikipedia.org/wiki/Ringelmann_scale

    Ringelmann smoke charts, 1897. The Ringelmann scale is a scale for measuring the apparent density or opacity of smoke. [1] [2] It was developed by a French professor of agricultural engineering Maximilien Ringelmann of La Station d'Essais de Machines in Paris, who first specified the scale in 1888.

  4. Aspirating smoke detector - Wikipedia

    en.wikipedia.org/wiki/Aspirating_smoke_detector

    An aspirating smoke detector (ASD) is a system used in active fire protection, consisting of a central detection unit which draws air through a network of pipes to detect smoke. [1] The sampling chamber is based on a nephelometer that detects the presence of smoke particles suspended in air by detecting the light scattered by them in the chamber.

  5. First Alert's smoke and CO detector can save your life - AOL

    www.aol.com/lifestyle/first-alert-smoke-co...

    A reliable smoke detector that also detects carbon monoxide just might save your life. Fortunately, the First Alert smoke and carbon monoxide detector is on sale for $22, or $41 off its list price!

  6. Optical beam smoke detector - Wikipedia

    en.wikipedia.org/wiki/Optical_beam_smoke_detector

    An optical beam smoke detector is a device that uses a projected beam of light to detect smoke across large areas, [1] typically as an indicator of fire. [2] They are used to detect fires in buildings where standard point smoke detectors would either be uneconomical [ 3 ] or restricted for use by the height of the building.

  7. First Alert - Wikipedia

    en.wikipedia.org/wiki/First_Alert

    On September 4, 1992, BRK recalled all hardwired smoke alarms under the series 1839I and 2839I due to testing programs determining that corrosion could form on the alarm horn's electrical contacts, causing the piezo to fail to make any noise. [6] In May 2006, First Alert combination smoke alarms were recalled due to draining batteries rapidly. [7]

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