GB1485790A - Fire sensor devices - Google Patents

Fire sensor devices

Info

Publication number
GB1485790A
GB1485790A GB4850574A GB4850574A GB1485790A GB 1485790 A GB1485790 A GB 1485790A GB 4850574 A GB4850574 A GB 4850574A GB 4850574 A GB4850574 A GB 4850574A GB 1485790 A GB1485790 A GB 1485790A
Authority
GB
United Kingdom
Prior art keywords
sensors
signals
zener diode
transistor
combined
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
GB4850574A
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
Application filed by Nohmi Bosai Kogyo Co Ltd filed Critical Nohmi Bosai Kogyo Co Ltd
Publication of GB1485790A publication Critical patent/GB1485790A/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

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

1485790 Ionization and semi-conductor smoke detectors NOHMI BOSAI KOGYO CO Ltd 8 Nov 1974 [9 Nov 1973 29 May 1974] 48505/74 Heading G1N [Also in Division G4] A fire alarm comprises two sensors, differently responsive to at least one phenomenon accompanying combustion and giving a progressive change in output signal in response to said phenomenon and a common evaluating circuit arranged so that an alarm signal is only given when the sum of changes in the output signals of the two sensors exceeds a predetermined level. In Fig. 3 one sensor is a semi-conductor CO sensitive device 90 having a heater 93 and a further electrode 92. The further sensor takes the form of a photo-electric smoke detector 12, 13. After amplification at 95, 72, 11, 76 the signals from the two sensors are combined at the collectors of transistors 72, 76 so that each tends to reduce the sensitivity of Zener diode 80. In the combined presence of adequate signals from both sensors, Zener diode 80 breaks down, so that transistor 81 turns on thyristor 7 and energizes the alarm relay 41. In Fig. 1 (not shown) a pair of ionization chambers are coupled to a FET connected in series with a junction transistor supplied with signals from a photo-electric detector. The combined outputs from the FET and junction transistor break down a Zener diode which turns on a transistor which triggers thyristor 7.
GB4850574A 1973-11-09 1974-11-08 Fire sensor devices Expired GB1485790A (en)

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
GB1485790A true GB1485790A (en) 1977-09-14

Family

ID=26402756

Family Applications (2)

Application Number Title Priority Date Filing Date
GB4850574A Expired GB1485790A (en) 1973-11-09 1974-11-08 Fire sensor devices
GB498977A Expired GB1486535A (en) 1973-11-09 1974-11-08 Fire sensor devices

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB498977A Expired GB1486535A (en) 1973-11-09 1974-11-08 Fire sensor devices

Country Status (4)

Country Link
CH (1) CH572252A5 (en)
DE (1) DE2452839B2 (en)
FR (1) FR2251060A1 (en)
GB (2) GB1485790A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975684A (en) * 1988-06-10 1990-12-04 Cerberus Ag Fire detecting system
US5005003A (en) * 1988-03-30 1991-04-02 Cerberus Ag Method of detecting fire in an early stage

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH586941A5 (en) * 1975-07-25 1977-04-15 Cerberus Ag
DE2702933C2 (en) * 1977-01-25 1985-08-29 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Fire alarm
JPS583272B2 (en) * 1978-06-07 1983-01-20 ホーチキ株式会社 fire detector
US4225860A (en) * 1979-01-15 1980-09-30 Pittway Corporation Sensitivity controlled dual input fire detector
US4401978A (en) * 1979-02-21 1983-08-30 The Gamewell Corporation Combination detector
US4316184A (en) * 1979-07-27 1982-02-16 Pittway Corporation Combination combustion-products detector
EP0039761A3 (en) * 1980-05-09 1981-11-25 Cerberus Ag Fire annunciating arrangement and method
JPS5977594A (en) * 1982-10-27 1984-05-04 ニツタン株式会社 Fire alarm system
DE3337330A1 (en) * 1983-10-13 1985-04-25 Siemens AG, 1000 Berlin und 8000 München METHOD AND ARRANGEMENT FOR ANALOGUE TRANSFER OF MEASURED VALUES OF THE RESPECTIVE FIRE CHARACTERISTICS OF A MULTI-CRITERIA FIRE DETECTOR
US6229439B1 (en) * 1998-07-22 2001-05-08 Pittway Corporation System and method of filtering
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
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5005003A (en) * 1988-03-30 1991-04-02 Cerberus Ag Method of detecting fire in an early stage
US4975684A (en) * 1988-06-10 1990-12-04 Cerberus Ag Fire detecting system

Also Published As

Publication number Publication date
DE2452839A1 (en) 1975-05-15
CH572252A5 (en) 1976-01-30
GB1486535A (en) 1977-09-21
DE2452839B2 (en) 1978-08-24
FR2251060A1 (en) 1975-06-06

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Legal Events

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