GB1320651A - Fire alarm systems - Google Patents

Fire alarm systems

Info

Publication number
GB1320651A
GB1320651A GB2523571*A GB2523571A GB1320651A GB 1320651 A GB1320651 A GB 1320651A GB 2523571 A GB2523571 A GB 2523571A GB 1320651 A GB1320651 A GB 1320651A
Authority
GB
United Kingdom
Prior art keywords
lines
transformer
detector
fire
scr
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
GB2523571*A
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.)
Nittan Co Ltd
Original Assignee
Nittan 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
Application filed by Nittan Co Ltd filed Critical Nittan Co Ltd
Publication of GB1320651A publication Critical patent/GB1320651A/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
    • G08B17/11—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
    • 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
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/04—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using a single signalling line, e.g. in a closed loop

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
GB2523571*A 1970-03-31 1971-04-19 Fire alarm systems Expired GB1320651A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2684270 1970-03-31

Publications (1)

Publication Number Publication Date
GB1320651A true GB1320651A (en) 1973-06-20

Family

ID=12204508

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2523571*A Expired GB1320651A (en) 1970-03-31 1971-04-19 Fire alarm systems

Country Status (6)

Country Link
US (1) US3778796A (enExample)
CA (1) CA939778A (enExample)
DE (1) DE2115759B2 (enExample)
FR (1) FR2083678B1 (enExample)
GB (1) GB1320651A (enExample)
ZA (1) ZA71780B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321747A (en) * 1997-01-30 1998-08-05 Rafiki Protection Limited Fire alarm system

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946374A (en) * 1970-08-13 1976-03-23 Sci Systems, Inc. Rate-of-change combustion and contamination detection device
CA1014675A (en) * 1973-03-19 1977-07-26 Frank W. Emerson Emergency alarm system
US4287515A (en) * 1979-04-27 1981-09-01 Baker Industries, Inc. Fire detection system with multiple output signals
US4435698A (en) 1980-06-11 1984-03-06 Hekatron Gmbh Circuit arrangement for the transmission of measurements to a central, especially in a fire alarm system
SE8202566L (sv) * 1982-04-23 1983-10-24 Ericsson Telefon Ab L M Forfarande och anordning for att i en slingkrets med ett forutbestemt antal parallellkopplade detektorer identifiera en larmande detektor
DE68917405D1 (de) * 1988-09-05 1994-09-15 Apollo Fire Detectors Ltd Anordnung zum Setzen von Markierungen zur Identifikation eines Feuerdetektors.
US5889468A (en) * 1997-11-10 1999-03-30 Banga; William Robert Extra security smoke alarm system
FR2897968B1 (fr) * 2006-02-24 2008-11-21 Airbus France Sas Systeme de detection d'incendie et aeronef equipe d'un tel systeme
US20090322526A1 (en) * 2008-06-25 2009-12-31 Lontka Karen D Arrangement and method for communicating with notification appliances
DE102021131104A1 (de) * 2021-11-26 2023-06-01 Dryad Networks GmbH Waldbrandfrüherkennungssystem mit piezo/bi-metall-sensor und verfahren zum betrieb eines waldbrandfrüherkennungssystems

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2607220A (en) * 1947-04-14 1952-08-19 Philip W Martin Means for measuring conditions in deep wells
FR983536A (fr) * 1949-02-03 1951-06-25 Installation radio-électrique de sécurité
US2662933A (en) * 1951-04-26 1953-12-15 Bell Telephone Labor Inc Multiplex carrier telegraph system
NL224947A (enExample) * 1957-02-19
US3388389A (en) * 1964-06-09 1968-06-11 Davis Foreman Alarm systems
US3357009A (en) * 1964-12-14 1967-12-05 Miller Peter Condition-responsive system for impressing distinctive frequency alarm tone on transmission line
US3484775A (en) * 1965-10-20 1969-12-16 Wallace Dean Cline Theft prevention system
CH473431A (de) * 1966-05-09 1969-05-31 Cerberus Ag Werk Fuer Elektron Verfahren zur Betriebsüberwachung von Feuermeldern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321747A (en) * 1997-01-30 1998-08-05 Rafiki Protection Limited Fire alarm system
GB2321747B (en) * 1997-01-30 2000-10-18 Rafiki Protection Limited Alarm system

Also Published As

Publication number Publication date
FR2083678A1 (enExample) 1971-12-17
CA939778A (en) 1974-01-08
DE2115759B2 (de) 1973-02-01
ZA71780B (en) 1971-10-27
US3778796A (en) 1973-12-11
DE2115759A1 (de) 1971-10-28
FR2083678B1 (enExample) 1974-10-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee