GB1338690A - Fire alarm system - Google Patents

Fire alarm system

Info

Publication number
GB1338690A
GB1338690A GB5173171A GB5173171A GB1338690A GB 1338690 A GB1338690 A GB 1338690A GB 5173171 A GB5173171 A GB 5173171A GB 5173171 A GB5173171 A GB 5173171A GB 1338690 A GB1338690 A GB 1338690A
Authority
GB
United Kingdom
Prior art keywords
fire
resistor
diode
current
switching device
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
GB5173171A
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.)
Securitas Alarm AB
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 GB1338690A publication Critical patent/GB1338690A/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)
  • Fire-Detection Mechanisms (AREA)
  • Alarm Systems (AREA)
GB5173171A 1970-11-12 1971-11-08 Fire alarm system Expired GB1338690A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7015288A SE402660B (sv) 1970-11-12 1970-11-12 Brandalarmanleggning

Publications (1)

Publication Number Publication Date
GB1338690A true GB1338690A (en) 1973-11-28

Family

ID=20300437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5173171A Expired GB1338690A (en) 1970-11-12 1971-11-08 Fire alarm system

Country Status (10)

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

Families Citing this family (26)

* 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 (de) * 1976-08-24 1986-11-13 Siemens AG, 1000 Berlin und 8000 München Brandmeldeanlage mit mehreren über eine Meldeschleife betreibbaren Meldern
DE2641489C2 (de) * 1976-09-15 1984-05-30 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Übertragung von Meßwerten in einem Brandmeldesystem
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
JPS595955B2 (ja) * 1979-07-27 1984-02-08 ホーチキ株式会社 火災報知機
DE2935335C2 (de) * 1979-08-31 1985-08-08 Siemens AG, 1000 Berlin und 8000 München Gleichstrommeldeanlage
DE3043357C2 (de) * 1980-11-17 1985-01-17 Siemens AG, 1000 Berlin und 8000 München Verfahren und Vorrichtung zur Widerstandsmessung an einer Meldeleitung
DK346982A (da) * 1981-02-06 1983-02-07 Inst For Ind Res & Standards Metode og apparat til identifikation af placeringen af en tilstandsaendring i en del af et elektrisk kredsloeb
JPS58134392A (ja) * 1982-02-04 1983-08-10 ニツタン株式会社 火災報知装置
ATE60682T1 (de) * 1985-11-26 1991-02-15 Siemens Ag Gefahrenmeldeanlage.
DE3719988A1 (de) * 1987-06-15 1988-12-29 Total Feuerschutz Gmbh Einzelidentifikation
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
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
US8847802B2 (en) 2011-10-06 2014-09-30 Microchip Technology Incorporated Microcontroller ADC with a variable sample and hold capacitor
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
US9252769B2 (en) 2011-10-07 2016-02-02 Microchip Technology Incorporated Microcontroller with optimized ADC controller
US9071264B2 (en) 2011-10-06 2015-06-30 Microchip Technology Incorporated Microcontroller with sequencer driven analog-to-digital converter
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 (de) * 1967-06-26 1969-02-15 Cerberus Ag Feuermeldeanlage
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

Also Published As

Publication number Publication date
US3832678A (en) 1974-08-27
NO131693B (enrdf_load_stackoverflow) 1975-04-01
DK129069B (da) 1974-08-12
DE2154537A1 (de) 1972-05-18
SE402660B (sv) 1978-07-10
BE775169A (fr) 1972-03-01
CH540539A (de) 1973-08-15
NO131693C (enrdf_load_stackoverflow) 1975-07-09
FI53762C (fi) 1978-07-10
NL7115165A (enrdf_load_stackoverflow) 1972-05-16
FI53762B (enrdf_load_stackoverflow) 1978-03-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee