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The speech concluded with a request for one of the world's largest ionization smoke alarm manufacturers and the CSIRO to disclose the level of visible smoke required to trigger the manufacturers' ionization smoke alarms under CSIRO scientific testing. [69] The US state of California banned the sale of smoke detectors with replaceable batteries ...
Conventional products released by Gent include the Xenex control panels, C3 conventional sounders, which were available with voice, [15] and the 17800 detector range (consisting of the 17830 Ionisation Smoke Detector, 17840 Optical Smoke Detector, 17850 Fixed Rate Heat Detector, 17860 Rate of Rise Heat Detector, and 17870 High Heat Detector ...
A smoking ban in England, making it illegal to smoke in all enclosed workplaces in England, came into force on 1 July 2007 as a consequence of the Health Act 2006. Similar bans had already been introduced by the rest of the United Kingdom: in Scotland on 26 March 2006, Wales on 2 April 2007 and Northern Ireland on 30 April 2007.
Ionization-type smoke detectors are gaseous ionization detectors in widespread use. A small source of radioactive americium is placed so that it maintains a current between two plates that effectively form an ionisation chamber. If smoke gets between the plates where ionization is taking place, the ionized gas can be neutralized leading to a ...
The alarm's circuitry detects this drop in the current and as a result, triggers the piezoelectric buzzer to sound. Compared to the alternative optical smoke detector, the ionization smoke detector is cheaper and can detect particles which are too small to produce significant light scattering. However, it is more prone to false alarms.
Other important contracts undertaken by the company during the late 1950s included a smoke detection system at the BBC TV Lime Grove Studios in London, smoke detectors for the Bristol Britannia aircraft, CO 2 fire-fighting systems for a number of British Rail diesel locomotives, and supplying fire detection and CO 2 systems for Lloyd's of London.
Shahab, Lion, and Robert West. "Public support in England for a total ban on the sale of tobacco products." Tobacco Control 19.2 (2010): 143-147. online "Smoking ban in the United Kingdom" (Centre for Public Impact, 2 Sept. 2019) online; Springfield, Lincoln. "The Tobacco War in Great Britain." The North American Review 174.547 (1902): 820-832 ...
In an ionisation type smoke detector, ambient air is allowed to freely enter the ionization chamber. The chamber contains a small amount of americium-241, which is an emitter of alpha particles which produce a constant ion current. If smoke enters the detector, it disrupts this current because ions strike smoke particles and are neutralized ...
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