GB1300909A - Ionization smoke detector - Google Patents

Ionization smoke detector

Info

Publication number
GB1300909A
GB1300909A GB51955/71A GB5195571A GB1300909A GB 1300909 A GB1300909 A GB 1300909A GB 51955/71 A GB51955/71 A GB 51955/71A GB 5195571 A GB5195571 A GB 5195571A GB 1300909 A GB1300909 A GB 1300909A
Authority
GB
United Kingdom
Prior art keywords
ionisation
smoke detector
diodes
wiper
nov
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
GB51955/71A
Inventor
Koju Sasaki
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 GB1300909A publication Critical patent/GB1300909A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
    • 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

Landscapes

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

Abstract

1300909 Ionisation gas detectors NITTAN CO Ltd 9 Nov 1971 [19 Nov 1970] 51955/71 Heading G1N In an ionisation smoke detector of the type having an open and a closed ionisation chamber 20, 10 and a FET 4 connected to the junction of the two chambers, a plurality of forwardly biased diodes 31, 32, 33 etc are arranged in the sourcedrain path of the F. E. T., whereby the sensitivity of the detector may be controlled by a wiper 9 and contacts 41, 42 &c. connected to respective diode junctions. Once selected, the wiper may be fixedly attached to the selected contact. The diodes may be Zener diodes and they may be formed as an integrated circuit unit 30.
GB51955/71A 1970-11-19 1971-11-09 Ionization smoke detector Expired GB1300909A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970114352U JPS4940290Y1 (en) 1970-11-19 1970-11-19

Publications (1)

Publication Number Publication Date
GB1300909A true GB1300909A (en) 1972-12-29

Family

ID=14635583

Family Applications (1)

Application Number Title Priority Date Filing Date
GB51955/71A Expired GB1300909A (en) 1970-11-19 1971-11-09 Ionization smoke detector

Country Status (5)

Country Link
US (1) US3792279A (en)
JP (1) JPS4940290Y1 (en)
DE (1) DE2156906B1 (en)
FR (1) FR2116395B1 (en)
GB (1) GB1300909A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103680042A (en) * 2013-11-30 2014-03-26 成都国科海博信息技术股份有限公司 Fire warning device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223303A (en) * 1978-12-11 1980-09-16 General Electric Company Alarm devices for interconnected multi-device systems
US4401979A (en) * 1981-02-11 1983-08-30 General Signal Corporation Electrical controls for ionization smoke detector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3089968A (en) * 1961-06-22 1963-05-14 Gen Precision Inc Non-linear amplifier
US3435257A (en) * 1965-05-17 1969-03-25 Burroughs Corp Threshold biased control circuit for trailing edge triggered flip-flops
US3395265A (en) * 1965-07-26 1968-07-30 Teledyne Inc Temperature controlled microcircuit
CH468683A (en) * 1966-12-29 1969-02-15 Cerberus Ag Werk Fuer Elektron Fire alarms with an electrical feedback arrangement
US3539831A (en) * 1967-06-15 1970-11-10 Tektronix Inc Switching circuit including plural ranks of differential circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103680042A (en) * 2013-11-30 2014-03-26 成都国科海博信息技术股份有限公司 Fire warning device

Also Published As

Publication number Publication date
JPS4940290Y1 (en) 1974-11-05
DE2156906B1 (en) 1972-05-25
US3792279A (en) 1974-02-12
FR2116395B1 (en) 1975-07-18
FR2116395A1 (en) 1972-07-13

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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