14 Facts About Smoke detector

Smoke detector is a device that senses smoke, typically as an indicator of fire.

Smoke detector can be detected either optically or by physical process .

Smoke detector expected the gas entering the sensor to bind to ionized air molecules and thereby alter an electric current in a circuit of the instrument.

Smoke detector invented a cold cathode tube that could amplify the small signal generated by the detection mechanism so that it was strong enough to activate an alarm.

Several developments in smoke detector technology occurred between 1971 and 1976, including the replacement of cold-cathode tubes with solid-state electronics.

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Smoke detector can be detected using a photoelectric sensor or an ionization process.

An ionization smoke detector uses a radioisotope, typically americium-241, to ionize air; a difference due to smoke is detected and an alarm is generated.

Smoke detector has two ionization chambers, one open to the air, and a reference chamber which does not allow the entry of particles.

The current drawn by an ionization smoke detector is low enough for a small battery used as sole or backup power supply to be able to provide power for years without the need for external wiring.

The radiation risk of exposure to an ionizing smoke detector operating normally is much smaller than natural background radiation.

Presentation by Siemens and the Canadian Fire Alarm Association reports that the ionization Smoke detector is the best at detecting incipient-stage fires with invisibly small particles, fast-flaming fires with smaller 0.

Where an ionizing smoke detector has been the only detector, fires in the early stages have not always been effectively detected.

The ionization smoke detector was found to be defectively designed, and in 2006 a jury in the United States District Court for the Northern District of New York decided that First Alert and its then parent company, BRK Brands, was liable for millions of dollars in damages.

Smoke detector coverage is 60 square meters and temperature smoke detector coverage is 20 square meters.