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GB1163121A - Improvements in and relating to Fire Alarm Apparatus. - Google Patents

Improvements in and relating to Fire Alarm Apparatus.

Info

Publication number
GB1163121A
GB1163121A GB36662/66A GB3666266A GB1163121A GB 1163121 A GB1163121 A GB 1163121A GB 36662/66 A GB36662/66 A GB 36662/66A GB 3666266 A GB3666266 A GB 3666266A GB 1163121 A GB1163121 A GB 1163121A
Authority
GB
United Kingdom
Prior art keywords
electrode
chamber
smoke
conduct
wire mesh
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
GB36662/66A
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.)
Nittan Co Ltd
Original Assignee
Nittan 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 Nittan Co Ltd filed Critical Nittan Co Ltd
Publication of GB1163121A publication Critical patent/GB1163121A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00—Details of radiation-measuring instruments
    • G01T7/12—Provision for actuation of an alarm
    • G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
    • 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

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Emergency Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Alarm Systems (AREA)

Abstract

1,163,121. Smoke detectors. NITTAN CO. Ltd. Aug.16, 1966 [March 30, 1966], No.36662/66. Heading G1N. [Also in Division H1] A smoke detector for a fire alarm system comprises a closed ionisation chamber 5, Fig.2, surrounded by a second ionisation chamber 8 open to the atmosphere through a wire mesh 6. A cupshaped electrode 1, forming part of the walls of the inner chamber, is common to both chambers and carries, on both sides, radio-active sources 2, 3, e.g. of radium. The second electrode of the inner chamber is provided by a disc 9 carried on an insulating support 5', e.g. of acrylic resin. Cylindrical members 7 together with the wire mesh 6 form the second electrode of the outer chamber. The common electrode 1 is connected to the gate electrode of an FET, Fig.3, normally arranged to be non-conducting. In the presence of smoke in the open ionisation chamber the voltage between the gate and source electrodes of the FET increases causing it to conduct. This in turn causes Zener diode D to conduct to trigger an SCR thereby producing a signal in receiver R which is used to energize an alarm. Reference has been directed by the Comptroller to Specification 1, 009, 271.
GB36662/66A 1966-03-30 1966-08-16 Improvements in and relating to Fire Alarm Apparatus. Expired GB1163121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1966028133U JPS446089Y1 (en) 1966-03-30 1966-03-30

Publications (1)

Publication Number Publication Date
GB1163121A true GB1163121A (en) 1969-09-04

Family

ID=12240260

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36662/66A Expired GB1163121A (en) 1966-03-30 1966-08-16 Improvements in and relating to Fire Alarm Apparatus.

Country Status (4)

Country Link
US (1) US3500368A (en)
JP (1) JPS446089Y1 (en)
BE (1) BE686726A (en)
GB (1) GB1163121A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138570A (en) * 1983-04-19 1984-10-24 Emi Ltd Smoke detector

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1277091A (en) * 1968-07-11 1972-06-07 Nittan Co Ltd Ionization type smoke detectors
GB1280304A (en) * 1968-09-26 1972-07-05 Hochiki Co A smoke sensing detector for smoke sensing apparatus
USRE30323E (en) * 1968-09-26 1980-07-01 Hochiki Kabushiki Kaisha Smoke detector adapted to a smoke sensing apparatus
US3573777A (en) * 1968-12-09 1971-04-06 Honeywell Inc Combustion products detector control apparatus
US3657713A (en) * 1969-06-02 1972-04-18 Nittan Co Ltd Device for testing ionization smoke detector
DE2029485B2 (en) * 1969-06-21 1971-11-25 Nittan Co. Ltd., Tokio IONIZATION SMOKE SENSORS
CH497755A (en) * 1969-06-24 1970-10-15 Cerberus Ag Ionization fire alarms
ZA704724B (en) * 1969-07-22 1971-03-31 Nittan Co Ltd Ionization smoke detector
NL7010779A (en) * 1969-07-24 1971-01-26
US3717862A (en) * 1969-10-16 1973-02-20 Nittan Co Ltd Fire detecting system and testing means therefor
US3657737A (en) * 1969-12-29 1972-04-18 Jeffrey E Hamm Method of and device for smoke detection and circuits therefor
US3736445A (en) * 1970-01-12 1973-05-29 Medar Inc Proximity detector
US3775616A (en) * 1970-06-08 1973-11-27 Nittan Co Ltd Ionization smoke detector
CH508251A (en) * 1970-07-23 1971-05-31 Cerberus Ag Ionization fire alarms
US3792254A (en) * 1971-07-15 1974-02-12 Vigifeu Ionization chamber in particular for a fire detection device
BE790355A (en) * 1971-10-20 1973-02-15 Bevaknings A B Securitas SMOKE DETECTOR
JPS5551239B2 (en) * 1971-12-29 1980-12-23
US3866195A (en) * 1973-05-07 1975-02-11 Fire Alert Company Combustion product detector and method of calibrating
US3909815A (en) * 1973-06-01 1975-09-30 Gamma Electronic Detector for fumes and combustion gases
US4091364A (en) * 1974-09-09 1978-05-23 Unitec, Inc. Combustion detection device
BE831296A (en) * 1975-07-11 1975-11-03 ION DETECTOR
JPS52111590U (en) * 1976-02-20 1977-08-24
US4097850A (en) * 1976-11-01 1978-06-27 Pittway Corporation Means for adjusting and for testing a detecting device
US4138664A (en) * 1976-12-14 1979-02-06 Pittway Corporation Warning device
US4148023A (en) * 1977-05-02 1979-04-03 E.D.I. Safety Devices, Inc. Emergency exit indicator
JPS583195Y2 (en) * 1977-10-20 1983-01-20 ツエルベルス・アクチェン・ゲゼルシャフト Ionic fire detector
US4187432A (en) * 1978-03-16 1980-02-05 NRD, Division of Mark IV Industries, Inc. Source holder for mounting radioactive foil and holder-foil assembly
CA1148279A (en) * 1979-12-14 1983-06-14 Andreas Scheidweiler Ionization smoke detector with increased operational reliability
US4396840A (en) * 1980-10-01 1983-08-02 Matsushita Electric Works, Ltd. Ionization type smoke sensing device
US4471346A (en) * 1981-06-02 1984-09-11 Eberhard Faber, Inc. Smoke detector
JP2006011540A (en) * 2004-06-22 2006-01-12 Nittan Co Ltd Ionization type smoke sensor
CN106324092A (en) * 2016-08-08 2017-01-11 清华大学 Device for on-line monitoring of the defects of fan's main shaft using electromagnetic ultrasonic guided-wave and the operation method thereof
KR102458479B1 (en) * 2017-09-28 2022-10-25 삼성전자 주식회사 Electronic device and method for controlling using the electronic device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646556A (en) * 1950-06-17 1953-07-21 C O Two Fire Equipment Co Supervised alarm system
US2702898A (en) * 1953-10-06 1955-02-22 Electro Watt Electrical And In Gas-responsive control apparatus
US3271756A (en) * 1960-03-22 1966-09-06 Harold J Burke Method and apparatus for detecting a hazardous condition
US3078450A (en) * 1961-08-03 1963-02-19 Martin J Mcginn Pressure compensated ionization chamber fire detector system
US3301307A (en) * 1963-11-12 1967-01-31 Ngk Insulators Ltd Device for detecting the configuration of a burning flame
US3310724A (en) * 1964-04-27 1967-03-21 Gen Electric Battery charging regulators

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138570A (en) * 1983-04-19 1984-10-24 Emi Ltd Smoke detector

Also Published As

Publication number Publication date
JPS446089Y1 (en) 1969-03-05
DE1516529B1 (en) 1970-06-25
BE686726A (en) 1967-02-15
US3500368A (en) 1970-03-10

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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