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GB1502376A - Fire sensor devices - Google Patents

Fire sensor devices

Info

Publication number
GB1502376A
GB1502376A GB1874975A GB1874975A GB1502376A GB 1502376 A GB1502376 A GB 1502376A GB 1874975 A GB1874975 A GB 1874975A GB 1874975 A GB1874975 A GB 1874975A GB 1502376 A GB1502376 A GB 1502376A
Authority
GB
United Kingdom
Prior art keywords
fire
sensor
thermistor
responsive
signals
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
GB1874975A
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.)
Nohmi Bosai Ltd
Original Assignee
Nohmi Bosai Kogyo Co 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
Priority claimed from JP1973130045U external-priority patent/JPS5725351Y2/ja
Priority claimed from JP1974061692U external-priority patent/JPS5756304Y2/ja
Priority claimed from JP1974101738U external-priority patent/JPS583189Y2/en
Application filed by Nohmi Bosai Kogyo Co Ltd filed Critical Nohmi Bosai Kogyo Co Ltd
Publication of GB1502376A publication Critical patent/GB1502376A/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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • 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
    • 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
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Abstract

1502376 Fire alarms NOHMI BOSAI KOGYO CO Ltd 5 May 1975 [25 Aug 1974] 18749/75 Addition to 1485790 Heading G4N A fire sensor includes sensors OX, TH1 responsive to two different phenomena accompanying combustion and coupled to an analogue multiplier Am arranged to provide a signal dependent on the arithmetic product of the signals from the two sensors. As shown, sensor OX is responsive to CO. and comprises a semiconductor having a heater and a further electrode h. Thermistor TH1 has a smaller thermal time-constant than thermistor TH2 so that the voltage at their junction is a function of rate of change of temperature. After passing threshold devices D1, D2, ZD, the signals are applied to an analogue multiplier Am which, if the product is sufficiently large as to indicate a fire, turns on transistors T3 ... T5 which energize alarm relay N. In Fig. 1 (not shown) the CO sensor OX is replaced by a photo-electric smoke detector. The system is supposed not to respond to cigarette smoke or to the vapours from newly applied paint.
GB1874975A 1973-11-09 1975-05-05 Fire sensor devices Expired GB1502376A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP1973130045U JPS5725351Y2 (en) 1973-11-09 1973-11-09
JP1974061692U JPS5756304Y2 (en) 1974-05-29 1974-05-29
JP1974101738U JPS583189Y2 (en) 1974-08-25 1974-08-25 Kasaikantiki

Publications (1)

Publication Number Publication Date
GB1502376A true GB1502376A (en) 1978-03-01

Family

ID=27297600

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1874975A Expired GB1502376A (en) 1973-11-09 1975-05-05 Fire sensor devices

Country Status (4)

Country Link
CH (1) CH579309A5 (en)
DE (1) DE2519267A1 (en)
FR (1) FR2283491A2 (en)
GB (1) GB1502376A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009135524A1 (en) * 2008-05-06 2009-11-12 Siemens Aktiengesellschaft Danger alarm

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2702933C2 (en) * 1977-01-25 1985-08-29 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Fire alarm
CH617279A5 (en) * 1977-06-24 1980-05-14 Cerberus Ag
EP0039761A3 (en) * 1980-05-09 1981-11-25 Cerberus Ag Fire annunciating arrangement and method
IT1198606B (en) * 1983-05-17 1988-12-21 Controfugas Srl FLAMMABLE GAS DETECTOR APPARATUS WITH PRECONDITIONED INTERVENTION
DE102014019172B4 (en) 2014-12-17 2023-12-07 Elmos Semiconductor Se Device and method for distinguishing between solid objects, cooking fumes and smoke using a compensating optical measuring system
DE102014019773B4 (en) 2014-12-17 2023-12-07 Elmos Semiconductor Se Device and method for distinguishing between solid objects, cooking fumes and smoke using the display of a mobile telephone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009135524A1 (en) * 2008-05-06 2009-11-12 Siemens Aktiengesellschaft Danger alarm

Also Published As

Publication number Publication date
CH579309A5 (en) 1976-08-31
DE2519267A1 (en) 1976-03-04
FR2283491A2 (en) 1976-03-26

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Legal Events

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