GB1280297A - Improvements in and relating to combustion detectors - Google Patents

Improvements in and relating to combustion detectors

Info

Publication number
GB1280297A
GB1280297A GB1058269A GB1058269A GB1280297A GB 1280297 A GB1280297 A GB 1280297A GB 1058269 A GB1058269 A GB 1058269A GB 1058269 A GB1058269 A GB 1058269A GB 1280297 A GB1280297 A GB 1280297A
Authority
GB
United Kingdom
Prior art keywords
horn
transistor
resistance
battery
changes
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
GB1058269A
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.)
Brk Electronics Inc
Original Assignee
Brk Electronics Inc
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 Brk Electronics Inc filed Critical Brk Electronics Inc
Publication of GB1280297A publication Critical patent/GB1280297A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/183—Single detectors using dual technologies
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • 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
    • 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)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Abstract

1280297 Transistor amplifier and switching circuits BRK ELECTRONICS Inc 27 May 1969 [29 Feb 1968 8 Aug 1968 13 Nov 1968] 10582/69 Heading H3T [Also in Division G4] In a fire alarm (see Division G4) a horn H is operated in response to the combination of changes in output of a humidity-sensitive resistance R and an ionization chamber R5. Resist. ance R is connected with resistor R2 in a bridge circuit arranged so that a rapid increase in humidity causes a rapid reduction in the value of resistance R, giving an increase in current in MOS transistor Q1. C1 shunts a negative feedback loop hence the circuit does not respond to slow changes. In the event of simultaneous presence of smoke, the resistance of an ionization chamber R5 changes sufficiently to change the current in MOS transistor Q3, the combination of currents from Q1 and Q3 being sufficient to turn on a thyristor Q5 which operates a horn H. Transistors Q4, diodes D and variable resistor R8 provide adjustable reference voltages for the two forms of sensor. R2 may be replaced by or shunted by a further transistor so that Cl charges rapidly on said switching on. Low-battery voltage alarm.-If the voltage of battery B falls to a value predetermined by R11, then capacitor C4 charges via R12 from a further battery B2 so as to trigger a programmable unijunction transistor Q6 which, in turn, turns on thyristor Q7 which operates the horn H. In Fig. 1 (not shown), the horn H is replaced by an indicator lamp and the circuit is operable from either 120 or 24 V. supply.
GB1058269A 1968-11-13 1969-05-27 Improvements in and relating to combustion detectors Expired GB1280297A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77548468A 1968-11-13 1968-11-13

Publications (1)

Publication Number Publication Date
GB1280297A true GB1280297A (en) 1972-07-05

Family

ID=25104570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1058269A Expired GB1280297A (en) 1968-11-13 1969-05-27 Improvements in and relating to combustion detectors

Country Status (7)

Country Link
US (1) US3611335A (en)
JP (1) JPS528158B1 (en)
DE (1) DE1957172A1 (en)
DK (1) DK131251B (en)
FR (1) FR2023218A1 (en)
GB (1) GB1280297A (en)
NO (1) NO124751B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993008550A1 (en) * 1991-10-24 1993-04-29 Capteur Sensors & Analysers Ltd. Fire detector and a method of detecting a fire

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805259A (en) * 1970-12-29 1974-04-16 Inoue Japax Res Smoke and fire alarm system
CH546989A (en) * 1972-12-06 1974-03-15 Cerberus Ag METHOD AND DEVICE FOR FIRE NOTIFICATION.
DE2314567B2 (en) * 1973-03-23 1978-10-12 Siemens Ag, 1000 Berlin Und 8000 Muenchen Fire alarm
DE2344908C2 (en) * 1973-09-06 1983-01-05 Verband der Sachversicherer e.V., 5000 Köln Process for the automatic reporting and extinguishing of fires as well as fixed fire extinguishing systems for the implementation of this process
CH583946A5 (en) * 1973-11-09 1977-01-14 Nohmi Bosai Kogyo Co Ltd
US3932850A (en) * 1975-01-22 1976-01-13 Pittway Corporation Warning device
US4168497A (en) * 1976-03-15 1979-09-18 Cerberus Ag Fire and smoke sensing system
JPS52124460U (en) * 1976-03-18 1977-09-21
US4225860A (en) * 1979-01-15 1980-09-30 Pittway Corporation Sensitivity controlled dual input fire detector
US4331952A (en) * 1980-09-22 1982-05-25 American District Telegraph Company Redundant sensor adapter
US4761639A (en) * 1985-12-20 1988-08-02 The Standard Oil Company Lightweight, compact detector of sudden changes in concentration of a gas
CH677413A5 (en) * 1988-06-10 1991-05-15 Cerberus Ag
DE4330226C1 (en) * 1993-09-07 1994-09-08 Bornemann J H Gmbh & Co Eccentric worm screw pump
JP3708727B2 (en) * 1998-10-30 2005-10-19 ホーチキ株式会社 Fire detector and fire detection method
TW563010B (en) 2001-06-25 2003-11-21 Em Microelectronic Marin Sa High-voltage regulator including an external regulating device
DE60115408T2 (en) * 2001-06-25 2006-08-24 Em Microelectronic-Marin S.A., Marin High voltage regulator with external control
CN108107779B (en) * 2017-12-15 2020-07-24 江苏厨安厨房自动灭火设备制造有限公司 Method for solving false alarm of automatic fire extinguishing system in kitchen

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA729816A (en) * 1966-03-08 N. Vassil Theo Fire detector
GB1073217A (en) * 1900-01-01
US2465377A (en) * 1938-11-24 1949-03-29 Banque Pour Entpr S Electr Gas-sensing control means with gas-discharge device
US2278920A (en) * 1939-03-15 1942-04-07 American District Telegraph Co Photoelectric smoke detection system
US2553420A (en) * 1948-09-29 1951-05-15 Photoswitch Inc Radiation detector
US2809317A (en) * 1949-02-21 1957-10-08 Electro Watt Electrical And In Device for intensifying an electric current
US2759174A (en) * 1952-08-26 1956-08-14 American District Telegraph Co Fire detector
US2702898A (en) * 1953-10-06 1955-02-22 Electro Watt Electrical And In Gas-responsive control apparatus
US2807006A (en) * 1955-10-24 1957-09-17 Collins Howard William Magnetic amplifier circuits
US2901740A (en) * 1956-11-23 1959-08-25 Specialties Dev Corp Electrical network automatically responsive to a change in condition
US3038106A (en) * 1958-12-12 1962-06-05 Specialties Dev Corp Electrical network automatically responsive to a change in condition
US3074053A (en) * 1960-03-01 1963-01-15 American District Telegraph Co Electrical system and method for protecting premises subject to varying ambient conditions
US3074054A (en) * 1960-11-16 1963-01-15 American District Telegraph Co Electrical system and method for protecting premises subject to varying ambient conditions
US3078450A (en) * 1961-08-03 1963-02-19 Martin J Mcginn Pressure compensated ionization chamber fire detector system
US3191068A (en) * 1962-11-29 1965-06-22 Powers Regulator Co Control circuit
US3255441A (en) * 1962-11-30 1966-06-07 Goodwin Smoke, flame, critical temperature and rate of temperature rise detector
US3245067A (en) * 1963-05-24 1966-04-05 B R K Electronics Inc Detection of products of combustion
US3268881A (en) * 1963-08-01 1966-08-23 Alfred W Vasel Detection device
US3364476A (en) * 1964-06-04 1968-01-16 Navy Usa Interaction analyzer
US3505641A (en) * 1965-10-20 1970-04-07 Honeywell Inc Aircraft condition control apparatus with redundant sensors
US3458774A (en) * 1967-01-03 1969-07-29 Res Associates Inc Magnetic proximity detector
US3541539A (en) * 1968-11-29 1970-11-17 Us Air Force Integrated fire and overheat detection system for manned flight vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993008550A1 (en) * 1991-10-24 1993-04-29 Capteur Sensors & Analysers Ltd. Fire detector and a method of detecting a fire

Also Published As

Publication number Publication date
DK131251C (en) 1975-11-17
JPS528158B1 (en) 1977-03-07
US3611335A (en) 1971-10-05
DK131251B (en) 1975-06-16
NO124751B (en) 1972-05-29
DE1957172A1 (en) 1970-07-09
FR2023218A1 (en) 1970-08-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee