ZA717125B - Improvements relating to smoke detectors - Google Patents

Improvements relating to smoke detectors

Info

Publication number
ZA717125B
ZA717125B ZA717125A ZA717125A ZA717125B ZA 717125 B ZA717125 B ZA 717125B ZA 717125 A ZA717125 A ZA 717125A ZA 717125 A ZA717125 A ZA 717125A ZA 717125 B ZA717125 B ZA 717125B
Authority
ZA
South Africa
Prior art keywords
improvements relating
smoke detectors
detectors
smoke
relating
Prior art date
Application number
ZA717125A
Inventor
W Peberdy
Original Assignee
Chubb Fire Security Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chubb Fire Security Ltd filed Critical Chubb Fire Security Ltd
Publication of ZA717125B publication Critical patent/ZA717125B/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
ZA717125A 1970-11-24 1971-10-25 Improvements relating to smoke detectors ZA717125B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5589170 1970-11-24

Publications (1)

Publication Number Publication Date
ZA717125B true ZA717125B (en) 1972-12-27

Family

ID=10475138

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA717125A ZA717125B (en) 1970-11-24 1971-10-25 Improvements relating to smoke detectors

Country Status (4)

Country Link
CA (1) CA950556A (en)
GB (1) GB1313877A (en)
MY (1) MY7400050A (en)
ZA (1) ZA717125B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011364B1 (en) * 1978-09-29 1983-05-18 Chubb Fire Limited Heat detector circuit
US4306230A (en) * 1979-12-10 1981-12-15 Honeywell Inc. Self-checking photoelectric smoke detector
US9207209B2 (en) * 2011-12-14 2015-12-08 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
US9189940B2 (en) * 2011-12-14 2015-11-17 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
EP3576063A3 (en) * 2015-08-13 2020-01-29 Siemens Schweiz AG Smoke detector unit with led and photoreceiver, led chip in the led and photosensor for determining ageing and/or a light beam compensation level, and led
CN110675591B (en) * 2019-09-14 2021-04-30 杭州拓深科技有限公司 Anti-interference photoelectric smoke detection method and detection module

Also Published As

Publication number Publication date
MY7400050A (en) 1974-12-31
CA950556A (en) 1974-07-02
GB1313877A (en) 1973-04-18

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