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2. 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.

3. Smoke detector - Wikipedia

   en.wikipedia.org/wiki/Smoke_detector

   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]

4. File:Optical beam smoke detector.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Optical_beam_smoke...

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5. File:Motorised reflective optical beam smoke detector.jpg

   en.wikipedia.org/wiki/File:Motorised_reflective...

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6. The Best Place to Put Your Smoke Detector (Plus 3 Spots ... - AOL

   www.aol.com/lifestyle/best-place-put-smoke...

   Replace smoke detectors at least every 10 years: Don't place your life in the hands of an outdated smoke alarm.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 ...

7. EN 54 - Wikipedia

   en.wikipedia.org/wiki/EN_54

   For smoke detectors according to EN 54-7 and fire detectors with smoke sensor (parts 12, 20 and 30 of EN 54) the test fires TF2, TF3, TF4 and TF5 are used. The EN 54-20 defines the following test fires with reduced fuel quantity for aspirating smoke detectors with enhanced or very high sensitivity (class A or B): TF2A and TF2B; TF3A and TF3B

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9. Moral Injury - The Huffington Post

   projects.huffingtonpost.com/moral-injury/joseph...

   Some troops leave the battlefield injured. Others return from war with mental wounds. Yet many of the 2 million Iraq and Afghanistan veterans suffer from a condition the Defense Department refuses to acknowledge: Moral injury.