GB1428652A - Alarm systems - Google Patents

Alarm systems

Info

Publication number
GB1428652A
GB1428652A GB643272A GB643272A GB1428652A GB 1428652 A GB1428652 A GB 1428652A GB 643272 A GB643272 A GB 643272A GB 643272 A GB643272 A GB 643272A GB 1428652 A GB1428652 A GB 1428652A
Authority
GB
United Kingdom
Prior art keywords
detector
fire
cable
alarm signal
operated
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
GB643272A
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.)
Plessey Co Ltd
Original Assignee
Plessey 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB643272A priority Critical patent/GB1428652A/en
Publication of GB1428652A publication Critical patent/GB1428652A/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
    • G08B25/06—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 power transmission lines
    • 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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B19/00—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow
    • G08B19/005—Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow combined burglary and fire alarm systems
    • 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
    • G08B17/113—Constructional details

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Abstract

1428652 Fire alarms; selective signalling PLESSEY CO Ltd 22 March 1973 [11 Feb 1972] 6432/72 Headings G4H and G4N [Also in Division G1] A fire alarm system comprises a detector arranged for communication through a mains feeder cable with an alarm signal producing means, an alarm signal being initiated when the detector is operated and ceases to transmit signals into the cable for reception at a location along the cable where the alarm signal producing means is situated. As described the detector is a smoke detector (see Division G1) which may incorporate a temperature detector and an intruder detector, and which may form part of a ceiling rose. A plurality of detectors may be provided each having associated with it means for transmitting pulses into the cable unless a fire is detected. The pulses may be delivered sequentially so that if one pulse in the sequence is missing, not only is a fire condition detected but the location of the detector which has been operated is also indicated. A fire detector 20 including a bimetallic strip or a fusible element is also provided.
GB643272A 1972-02-11 1972-02-11 Alarm systems Expired GB1428652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB643272A GB1428652A (en) 1972-02-11 1972-02-11 Alarm systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB643272A GB1428652A (en) 1972-02-11 1972-02-11 Alarm systems

Publications (1)

Publication Number Publication Date
GB1428652A true GB1428652A (en) 1976-03-17

Family

ID=9814382

Family Applications (1)

Application Number Title Priority Date Filing Date
GB643272A Expired GB1428652A (en) 1972-02-11 1972-02-11 Alarm systems

Country Status (1)

Country Link
GB (1) GB1428652A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119981A (en) * 1982-01-07 1983-11-23 Morrison John M Alarm Systems
GB2175722A (en) * 1985-05-20 1986-12-03 London New Technology Network Security systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119981A (en) * 1982-01-07 1983-11-23 Morrison John M Alarm Systems
GB2175722A (en) * 1985-05-20 1986-12-03 London New Technology Network Security systems
GB2175722B (en) * 1985-05-20 1989-07-05 London New Technology Network Security systems

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Legal Events

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