GB1374418A - Fire detection systems and apparatus - Google Patents

Fire detection systems and apparatus

Info

Publication number
GB1374418A
GB1374418A GB5492970A GB5492970A GB1374418A GB 1374418 A GB1374418 A GB 1374418A GB 5492970 A GB5492970 A GB 5492970A GB 5492970 A GB5492970 A GB 5492970A GB 1374418 A GB1374418 A GB 1374418A
Authority
GB
United Kingdom
Prior art keywords
detectors
signal
output
alarm
response
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
GB5492970A
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB5492970A priority Critical patent/GB1374418A/en
Publication of GB1374418A publication Critical patent/GB1374418A/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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/16—Security signalling or alarm systems, e.g. redundant 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)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

1374418 Fire alarms EMI Ltd 12 Nov 1971 [19 Nov 1970] 54929/70 Heading G4N [Also in Division A5] A fire detection system comprises at least three fire detectors for producing output signals in response to phenomena occurring in the case of fire and means for producing an alarm signal in response to an output signal from a first of said detectors and in response to a combined output from two others of said detectors. The detectors are mounted in a head 3 on a telescopic mast 2 supported by a portable control unit 1. The first detector 11 is responsive to a temperature rise above 90‹ C. whilst the other two detectors 9, 10 are respectively responsive to smoke and to temperature above 58‹ C. The detectors 9 ... 11 and associated transistors 12 ... 14 are mounted in the head 3 and connected by a convoluted cable 24 to the control unit 1. In the event of an output from detectors 9 or 10 alone, a signal of + 9À6 V is fed to transistor 31, the output of which is then sufficient to operate a threshold circuit B which turns on a 1Hz multivibrator 35 so as to provide intermittent operation of a relay 37 and audible alarm 38. Relay 37 provides flashing of lamps 4a, 4b and 5a, 5b mounted on the head 3. A combined response from detectors 9, 10, or a response from the high temperature detector 11 results in a signal of + 13À2V being fed to transistor 31 which signal also operates threshold unit C which overrides the output from the multivibrator 39 and gives continuous operation of the alarm 38 and lamps 4a ... 5b. Fire extinguishing.-A signal on line 43 opens a valve 7 which releases BCF extinguishant from a container 6. A switch 44 is also opened so as to allow operation of a 10 kHz unijunction transistor oscillator 45 to feed signals along line 32 to a remote alarm. Fault detection.-A line-terminating transistor 26 is included in the head 3 which normally maintains + 6V at the base of transistor 31. In the event of this voltage becoming reduced, a threshold unit D is operated which turns on a multivibrator 41, giving intermittent operation of an alarm 42 and continuous operation of a lamp 4c. Undesired release of extinguishant will open switch 44, operate a lamp 4d and an audible alarm.
GB5492970A 1971-11-12 1971-11-12 Fire detection systems and apparatus Expired GB1374418A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5492970A GB1374418A (en) 1971-11-12 1971-11-12 Fire detection systems and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5492970A GB1374418A (en) 1971-11-12 1971-11-12 Fire detection systems and apparatus

Publications (1)

Publication Number Publication Date
GB1374418A true GB1374418A (en) 1974-11-20

Family

ID=10472493

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5492970A Expired GB1374418A (en) 1971-11-12 1971-11-12 Fire detection systems and apparatus

Country Status (1)

Country Link
GB (1) GB1374418A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142757A (en) * 1983-05-21 1985-01-23 Graviner Ltd Improvements in and relating to fire and explosion detection and suppression
GB2205493A (en) * 1987-06-05 1988-12-14 John Gavin Beaumont Portable fire extinguisher
GB2252191A (en) * 1991-01-18 1992-07-29 Hochiki Co Combined method of determining fires

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142757A (en) * 1983-05-21 1985-01-23 Graviner Ltd Improvements in and relating to fire and explosion detection and suppression
GB2205493A (en) * 1987-06-05 1988-12-14 John Gavin Beaumont Portable fire extinguisher
GB2205493B (en) * 1987-06-05 1990-12-12 John Gavin Beaumont Improvements in or relating to safety apparatus
GB2252191A (en) * 1991-01-18 1992-07-29 Hochiki Co Combined method of determining fires
AU650938B2 (en) * 1991-01-18 1994-07-07 Hochiki Kabushiki Kaisha Combined method of determining fires
GB2252191B (en) * 1991-01-18 1994-10-12 Hochiki Co Method of determining fires

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee