GB2017994B - Electrical apparatus for detecting an alarm condition eg optical smoke detectors - Google Patents

Electrical apparatus for detecting an alarm condition eg optical smoke detectors

Info

Publication number
GB2017994B
GB2017994B GB7908855A GB7908855A GB2017994B GB 2017994 B GB2017994 B GB 2017994B GB 7908855 A GB7908855 A GB 7908855A GB 7908855 A GB7908855 A GB 7908855A GB 2017994 B GB2017994 B GB 2017994B
Authority
GB
United Kingdom
Prior art keywords
detecting
electrical apparatus
alarm condition
smoke detectors
optical smoke
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB7908855A
Other languages
English (en)
Other versions
GB2017994A (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American District Telegraph Co
Original Assignee
American District Telegraph Co
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 American District Telegraph Co filed Critical American District Telegraph Co
Publication of GB2017994A publication Critical patent/GB2017994A/en
Application granted granted Critical
Publication of GB2017994B publication Critical patent/GB2017994B/en
Expired legal-status Critical Current

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
    • G08B17/103—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

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
GB7908855A 1978-03-13 1979-03-13 Electrical apparatus for detecting an alarm condition eg optical smoke detectors Expired GB2017994B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/885,370 US4193069A (en) 1978-03-13 1978-03-13 Latching alarm smoke detector

Publications (2)

Publication Number Publication Date
GB2017994A GB2017994A (en) 1979-10-10
GB2017994B true GB2017994B (en) 1982-11-17

Family

ID=25386756

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7908855A Expired GB2017994B (en) 1978-03-13 1979-03-13 Electrical apparatus for detecting an alarm condition eg optical smoke detectors

Country Status (6)

Country Link
US (1) US4193069A (enExample)
JP (1) JPS54151399A (enExample)
CA (1) CA1107839A (enExample)
DE (1) DE2909810A1 (enExample)
FR (1) FR2420173A1 (enExample)
GB (1) GB2017994B (enExample)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH638331A5 (de) * 1979-02-22 1983-09-15 Cerberus Ag Rauchdetektor.
US4260984A (en) * 1979-03-17 1981-04-07 Hochiki Corporation Count discriminating fire detector
JPS6033035A (ja) * 1983-08-02 1985-02-20 Hochiki Corp 減光式煙感知器
JPS6095689U (ja) * 1983-11-30 1985-06-29 ホーチキ株式会社 煙感知器
DE69325852T2 (de) * 1992-05-25 2000-01-27 Nohmi Bosai Ltd., Tokio/Tokyo Feuerdetektor
JP3128633B2 (ja) * 1992-05-25 2001-01-29 能美防災株式会社 イオン化式煙感知器
JP3202793B2 (ja) * 1992-05-28 2001-08-27 能美防災株式会社 火災感知器の感度測定装置
AU652513B2 (en) * 1992-06-29 1994-08-25 Nohmi Bosai Ltd Smoke detecting apparatus for fire alarm
US5473314A (en) * 1992-07-20 1995-12-05 Nohmi Bosai, Ltd. High sensitivity smoke detecting apparatus using a plurality of sample gases for calibration
AU653684B2 (en) * 1992-11-04 1994-10-06 Nohmi Bosai Ltd Smoke detecting apparatus for fire alarm
DE4307244C2 (de) * 1993-03-08 1995-01-19 Siemens Ag Gefahrenmeldesystem
JP3588535B2 (ja) * 1997-06-30 2004-11-10 ホーチキ株式会社 煙感知装置
RU2161823C2 (ru) * 1999-08-26 2001-01-10 Акционерное общество закрытого типа "Сфинкс" Индикатор степени взрывоопасности газовоздушной смеси
JP7419151B2 (ja) 2020-04-21 2024-01-22 株式会社東芝 サーバ装置、情報処理方法およびプログラム
JP7438835B2 (ja) 2020-04-21 2024-02-27 株式会社東芝 サーバ装置、通信システム、プログラムおよび情報処理方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842409A (en) * 1972-12-13 1974-10-15 Unitec Inc Ionization detector apparatus
JPS5545506Y2 (enExample) * 1972-12-14 1980-10-24
US3946241A (en) * 1973-11-26 1976-03-23 Pyrotector, Incorporated Light detector with pulsed light source and synchronous data gating
JPS52153759A (en) * 1976-06-17 1977-12-21 Hochiki Co Storage type detector
US4075499A (en) * 1976-11-16 1978-02-21 Chloride, Incorporated Smoke detector with means for changing light pulse frequency

Also Published As

Publication number Publication date
FR2420173A1 (fr) 1979-10-12
FR2420173B1 (enExample) 1984-11-09
GB2017994A (en) 1979-10-10
JPS6239472B2 (enExample) 1987-08-24
JPS54151399A (en) 1979-11-28
US4193069A (en) 1980-03-11
CA1107839A (en) 1981-08-25
DE2909810A1 (de) 1979-09-27

Similar Documents

Publication Publication Date Title
GB2079010B (en) Optical detection device
DE3176433D1 (en) Optical system for intruder detecting device
GB1539290A (en) Smoke detection apparatus
GB2090411B (en) Object detecting apparatus
JPS5335344A (en) Mechanical method for detecting detail and detail detector
GB2020434B (en) Apparatus for humidity detection
GB2029585B (en) Temperature detecting apparatus
GB2017994B (en) Electrical apparatus for detecting an alarm condition eg optical smoke detectors
JPS54134691A (en) Gas detection alarm
DE2963179D1 (en) Humidity variation detecting apparatus
GB2023285B (en) Radiation detection apparatus
GB2032626B (en) Cable detecting apparatus
GB2029588B (en) Detectors for detecting the presence of an electrical signal with predetermined characteristics
NO822254L (no) Apparat for deteksjon av elektriske parasittforbindelser
GB2057121B (en) Photoelectric detection apparatus
ES498274A0 (es) Dispositivo detector de humos
JPS52113785A (en) Smoke detecting apparatus
GB2074721B (en) Smoke sensor apparatus
GB2048536B (en) Intruder detection system
JPS5337093A (en) Detection element for electroochemical oxygen measuring apparatus
JPS5449134A (en) Focal plane detecting apparatus of optical system
AR228973A1 (es) Aparato detector de gas inflamable
GB2244325B (en) An infrared detection device
JPS5320988A (en) Photoelectric smoke detecting system
JPS56129842A (en) Optical smoke concentration measuring device

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee