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
Other languages
English (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.)
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)
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 (enrdf_load_stackoverflow) 1973-11-09 1973-11-09
JP1974061692U JPS5756304Y2 (enrdf_load_stackoverflow) 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 (enrdf_load_stackoverflow)
DE (1) DE2452839B2 (enrdf_load_stackoverflow)
FR (1) FR2251060A1 (enrdf_load_stackoverflow)
GB (2) GB1485790A (enrdf_load_stackoverflow)

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 (enrdf_load_stackoverflow) * 1975-07-25 1977-04-15 Cerberus Ag
DE2702933C2 (de) * 1977-01-25 1985-08-29 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Brandmelder
JPS583272B2 (ja) * 1978-06-07 1983-01-20 ホーチキ株式会社 火災感知器
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 (de) * 1980-05-09 1981-11-25 Cerberus Ag Verfahren zur Brandmeldung und Brandmeldeanlage
JPS5977594A (ja) * 1982-10-27 1984-05-04 ニツタン株式会社 火災警報システム
DE3337330A1 (de) * 1983-10-13 1985-04-25 Siemens AG, 1000 Berlin und 8000 München Verfahren und anordnung zur analogen messwertuebertragung der jeweiligen brandkenngroessen eines mehrkriterien-brandmelders
US6229439B1 (en) * 1998-07-22 2001-05-08 Pittway Corporation System and method of filtering
DE102014019172B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mit einem kompensierenden optischen Messsystem
DE102014019773B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mittels des Displays eines Mobiltelefons

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

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Legal Events

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