CA944454A - Fire detecting system - Google Patents

Fire detecting system

Info

Publication number
CA944454A
CA944454A CA133,794A CA133794A CA944454A CA 944454 A CA944454 A CA 944454A CA 133794 A CA133794 A CA 133794A CA 944454 A CA944454 A CA 944454A
Authority
CA
Canada
Prior art keywords
detecting system
fire detecting
fire
detecting
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
CA133,794A
Other versions
CA133794S (en
Inventor
Hayami Yuasa
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
Application granted granted Critical
Publication of CA944454A publication Critical patent/CA944454A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
CA133,794A 1971-02-04 1972-02-02 Fire detecting system Expired CA944454A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP403271 1971-02-04

Publications (1)

Publication Number Publication Date
CA944454A true CA944454A (en) 1974-03-26

Family

ID=11573607

Family Applications (1)

Application Number Title Priority Date Filing Date
CA133,794A Expired CA944454A (en) 1971-02-04 1972-02-02 Fire detecting system

Country Status (4)

Country Link
US (1) US3797008A (en)
CA (1) CA944454A (en)
DE (1) DE2204101C2 (en)
FR (1) FR2124329B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30394E (en) 1978-04-04 1980-09-02 Westinghouse Electric Corp. Signal bandpass filter apparatus

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016480A (en) * 1974-03-04 1977-04-05 Zenith Radio Corporation Dual function coupling system and method
US4148019A (en) * 1975-03-05 1979-04-03 Thomas Industries Inc. Security alarm transmission system
DE2539180A1 (en) * 1975-09-03 1977-03-24 Siemens Ag Fire alarm loop with fault indication - uses pulse voltage generator reacting to break in sensor loop to trigger indicator
DE2638068C3 (en) * 1976-08-24 1986-11-13 Siemens AG, 1000 Berlin und 8000 München Fire alarm system with several detectors that can be operated via a message loop
DE2641489C2 (en) * 1976-09-15 1984-05-30 Siemens AG, 1000 Berlin und 8000 München Method for the transmission of measured values in a fire alarm system
US4101887A (en) * 1976-09-24 1978-07-18 Walter Kidde And Co., Inc. Monitored fire protection system
US4134111A (en) * 1976-12-16 1979-01-09 N.V. Tools Limited Aerosol detector and method
US4250484A (en) * 1977-11-21 1981-02-10 Marine Electric Corporation Alarm system for detecting a plurality of different alarm conditions
US4282517A (en) * 1977-12-09 1981-08-04 Potter Electric Signal Company Automatic ringback for direct current monitoring system
US4385287A (en) * 1979-12-07 1983-05-24 Securicor Granley Systems Limited Multiple alarm condition detection and signalling
CA1148279A (en) * 1979-12-14 1983-06-14 Andreas Scheidweiler Ionization smoke detector with increased operational reliability
JPS61229195A (en) * 1985-04-03 1986-10-13 株式会社日本自動車部品総合研究所 Signal transmission system
DE10051329C2 (en) 2000-10-10 2003-12-11 Job Lizenz Gmbh & Co Kg Alarm system
EP1777671A1 (en) * 2005-10-19 2007-04-25 Honeywell International, Inc. Monitoring of alarm system wiring
US8477042B2 (en) * 2008-02-08 2013-07-02 Siemens Industry, Inc. Apparatus for signaling different notification appliance circuit configurations
DE102008048929B4 (en) * 2008-09-25 2010-06-24 Novar Gmbh Testing the detection lines of a hazard detection system
ES2384146A1 (en) * 2010-02-02 2012-07-02 General Electric Company Detection circuit, detection system, and method of assembling a detection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE30394E (en) 1978-04-04 1980-09-02 Westinghouse Electric Corp. Signal bandpass filter apparatus

Also Published As

Publication number Publication date
AU3801772A (en) 1973-07-26
DE2204101C2 (en) 1974-01-31
DE2204101B1 (en) 1973-07-05
US3797008A (en) 1974-03-12
FR2124329A1 (en) 1972-09-22
FR2124329B1 (en) 1975-10-24

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