비의류제품

a new fire alarm system for electrical installations

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 496
fires in electrical installations are considered to develop in four phases - initiation, smouldering, flame formation and heat development. cables are among the more sensitive components, with working temperatures around 50 degreesc and fire detection at 70 degreesc. conventional alarms include smoke detectors. the new technique described uses microcapsules containing powder forming a gas of the freon type after diffusion. a typical microcapsule loses 4percent per year and has a natural life of 10 years. fabrication methods are described. detection is by gas concentration, with a sensitivity of 1 to 10 ppm, or by acoustic methods with microphones to pick up the sound of fractures. pressure/temperature characteristics of various types of freon mixtures commercially available are given in graphical form
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