CH540539A - Fire alarm system - Google Patents

Fire alarm system

Info

Publication number
CH540539A
CH540539A CH1620671A CH1620671A CH540539A CH 540539 A CH540539 A CH 540539A CH 1620671 A CH1620671 A CH 1620671A CH 1620671 A CH1620671 A CH 1620671A CH 540539 A CH540539 A CH 540539A
Authority
CH
Switzerland
Prior art keywords
alarm system
fire alarm
fire
alarm
Prior art date
Application number
CH1620671A
Other languages
German (de)
Inventor
Gysell Bjoern
Nilsson Karl-Axel
Nilvid Gary
Original Assignee
Securitas Alarm Ab
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 Securitas Alarm Ab filed Critical Securitas Alarm Ab
Publication of CH540539A publication Critical patent/CH540539A/en

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)
  • Fire-Detection Mechanisms (AREA)
  • Alarm Systems (AREA)
CH1620671A 1970-11-12 1971-11-08 Fire alarm system CH540539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7015288A SE402660B (en) 1970-11-12 1970-11-12 FIREPLACE FACILITY

Publications (1)

Publication Number Publication Date
CH540539A true CH540539A (en) 1973-08-15

Family

ID=20300437

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1620671A CH540539A (en) 1970-11-12 1971-11-08 Fire alarm system

Country Status (10)

Country Link
US (1) US3832678A (en)
BE (1) BE775169A (en)
CH (1) CH540539A (en)
DE (1) DE2154537A1 (en)
DK (1) DK129069B (en)
FI (1) FI53762C (en)
GB (1) GB1338690A (en)
NL (1) NL7115165A (en)
NO (1) NO131693C (en)
SE (1) SE402660B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028395A1 (en) * 1979-07-27 1981-02-12 Hochiki Co FIRE DETECTOR AND FIRE ALARM SYSTEM FOR ITS USE

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3991413A (en) * 1975-06-23 1976-11-09 Berger Philip H Constant current detector system
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
US4110683A (en) * 1977-07-08 1978-08-29 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Apparatus including a plurality of spaced transformers for locating short circuits in cables
US4287515A (en) * 1979-04-27 1981-09-01 Baker Industries, Inc. Fire detection system with multiple output signals
DE2935335C2 (en) * 1979-08-31 1985-08-08 Siemens AG, 1000 Berlin und 8000 München DC alarm system
DE3043357C2 (en) * 1980-11-17 1985-01-17 Siemens AG, 1000 Berlin und 8000 München Method and device for measuring resistance on a signal line
DK346982A (en) * 1981-02-06 1983-02-07 Inst For Ind Res & Standards METHOD AND APPARATUS FOR IDENTIFYING THE LOCATION OF A STATE CHANGE IN A PART OF AN ELECTRIC CIRCUIT
JPS58134392A (en) * 1982-02-04 1983-08-10 ニツタン株式会社 Fire alarm
EP0224819B1 (en) * 1985-11-26 1991-01-30 Siemens Aktiengesellschaft Danger-signalling system
DE3719988A1 (en) * 1987-06-15 1988-12-29 Total Feuerschutz Gmbh INDIVIDUAL IDENTIFICATION
WO1999053627A1 (en) 1998-04-10 1999-10-21 Chrimar Systems, Inc. Doing Business As Cms Technologies System for communicating with electronic equipment on a network
US9252769B2 (en) 2011-10-07 2016-02-02 Microchip Technology Incorporated Microcontroller with optimized ADC controller
US9467141B2 (en) 2011-10-07 2016-10-11 Microchip Technology Incorporated Measuring capacitance of a capacitive sensor with a microcontroller having an analog output for driving a guard ring
US8847802B2 (en) 2011-10-06 2014-09-30 Microchip Technology Incorporated Microcontroller ADC with a variable sample and hold capacitor
US9071264B2 (en) 2011-10-06 2015-06-30 Microchip Technology Incorporated Microcontroller with sequencer driven analog-to-digital converter
US9257980B2 (en) 2011-10-06 2016-02-09 Microchip Technology Incorporated Measuring capacitance of a capacitive sensor with a microcontroller having digital outputs for driving a guard ring
US9437093B2 (en) * 2011-10-06 2016-09-06 Microchip Technology Incorporated Differential current measurements to determine ION current in the presence of leakage current
US9176088B2 (en) 2011-12-14 2015-11-03 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
US9189940B2 (en) 2011-12-14 2015-11-17 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
US9207209B2 (en) 2011-12-14 2015-12-08 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
US9823280B2 (en) 2011-12-21 2017-11-21 Microchip Technology Incorporated Current sensing with internal ADC capacitor
US8884771B2 (en) 2012-08-01 2014-11-11 Microchip Technology Incorporated Smoke detection using change in permittivity of capacitor air dielectric
CA3006178C (en) 2018-05-25 2021-02-02 Stephen D. Ainsworth Fire alarm testing device and method
US10210747B1 (en) * 2018-05-25 2019-02-19 Stephen David Ainsworth Fire alarm testing device and method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268881A (en) * 1963-08-01 1966-08-23 Alfred W Vasel Detection device
CH468682A (en) * 1967-06-26 1969-02-15 Cerberus Ag Fire alarm system
GB1178957A (en) * 1968-04-29 1970-01-28 Goodwin Alfred George Ive Improvements in and relating to Electrical Protective Systems
US3611362A (en) * 1969-03-19 1971-10-05 Gen Signal Of Canada Ltd Alarm sensing and indicating systems
US3653025A (en) * 1969-08-04 1972-03-28 Caswell Equipment Co Inc Signalling system
US3676877A (en) * 1970-04-18 1972-07-11 Mittan Co Ltd Fire alarm system with fire zone locator using zener diode voltage monitoring
US3716834A (en) * 1971-10-07 1973-02-13 H Adams Data transmission system with immunity to circuit faults
US3711854A (en) * 1971-10-19 1973-01-16 Federal Sign And Signal Corp Parallel alarm circuit having series supervision

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028395A1 (en) * 1979-07-27 1981-02-12 Hochiki Co FIRE DETECTOR AND FIRE ALARM SYSTEM FOR ITS USE

Also Published As

Publication number Publication date
NO131693B (en) 1975-04-01
FI53762C (en) 1978-07-10
BE775169A (en) 1972-03-01
DK129069B (en) 1974-08-12
SE402660B (en) 1978-07-10
FI53762B (en) 1978-03-31
NL7115165A (en) 1972-05-16
DE2154537A1 (en) 1972-05-18
US3832678A (en) 1974-08-27
NO131693C (en) 1975-07-09
GB1338690A (en) 1973-11-28

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Legal Events

Date Code Title Description
PL Patent ceased