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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.
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The rechargeable batteries were often replaced by a pair of AA batteries along with a plastic shell encasing the detector. The photoelectric (optical) smoke detector was invented by Donald Steele and Robert Emmark from Electro Signal Lab and patented in 1972. [15] In 1995, the 10-year-lithium-battery-powered smoke alarm was introduced. [10]
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Replace smoke detectors at least every 10 years: Don't place your life in the hands of an outdated smoke alarm. For the most part, you can plan on replacing your smoke detector at least every 10 ...
Optical beam smoke detector; Q. Q2B; S. Smoke detector This page was last edited on 28 January 2024, at 05:24 (UTC). Text is available under the Creative ...
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