Smoke detector
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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 i
Smoke detector mounted on a ceiling
Optical smoke detector with the cover removed; the angled plastic in an arc across the top is a light baffle
Inside a basic ionization smoke detector. The black, round structure at the right is the ionization chamber. The white, round structure at the upper left is the piezoelectric horn that produces the alarm sound.
An americium container from a smoke detector
Heat detector
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A heat detector is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass and conductivity of the e
Smoke detector
…deaths without (2009–2013). Smoke detectors are not suitable for every location in a building, for instance in a kitchen of a domestic property, where a heat detector would be more suitable instead. The first automatic electric fire alarm was patented in 1890 by Francis Robbins Upton, an associate of Thomas Edison…
A residential heat detector