GB1282536A - Ionization smoke detectors - Google Patents

Ionization smoke detectors

Info

Publication number
GB1282536A
GB1282536A GB35971/70A GB3597170A GB1282536A GB 1282536 A GB1282536 A GB 1282536A GB 35971/70 A GB35971/70 A GB 35971/70A GB 3597170 A GB3597170 A GB 3597170A GB 1282536 A GB1282536 A GB 1282536A
Authority
GB
United Kingdom
Prior art keywords
fet
scr
ionization
july
smoke detectors
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
GB35971/70A
Other languages
English (en)
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
Priority claimed from JP6683969A external-priority patent/JPS4819118B1/ja
Application filed by Nittan Co Ltd filed Critical Nittan Co Ltd
Publication of GB1282536A publication Critical patent/GB1282536A/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
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Toxicology (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • General Health & Medical Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
GB35971/70A 1969-07-24 1970-07-24 Ionization smoke detectors Expired GB1282536A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5797969 1969-07-24
JP6683969A JPS4819118B1 (en:Method) 1969-08-26 1969-08-26

Publications (1)

Publication Number Publication Date
GB1282536A true GB1282536A (en) 1972-07-19

Family

ID=26399064

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35971/70A Expired GB1282536A (en) 1969-07-24 1970-07-24 Ionization smoke detectors

Country Status (7)

Country Link
US (1) US3688119A (en:Method)
CH (1) CH526178A (en:Method)
DE (1) DE2036447B2 (en:Method)
FR (1) FR2055543A5 (en:Method)
GB (1) GB1282536A (en:Method)
IL (1) IL35151A (en:Method)
NL (1) NL7010779A (en:Method)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3812362A (en) * 1973-07-02 1974-05-21 Honeywell Inc Smoke detector circuit
CH586941A5 (en:Method) * 1975-07-25 1977-04-15 Cerberus Ag
US4228429A (en) * 1977-12-29 1980-10-14 Ricoh Company, Ltd. Alarm system having phase-sensitive bridge circuit
US4401979A (en) * 1981-02-11 1983-08-30 General Signal Corporation Electrical controls for ionization smoke detector

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516083A (en) * 1965-12-02 1970-06-02 Denske Securitas As Electric alarm system,preferably for a fire alarm
JPS446089Y1 (en:Method) * 1966-03-30 1969-03-05

Also Published As

Publication number Publication date
DE2036447A1 (de) 1971-02-25
IL35151A (en) 1973-08-29
IL35151A0 (en) 1970-10-30
DE2036447B2 (de) 1972-03-02
US3688119A (en) 1972-08-29
CH526178A (de) 1972-07-31
NL7010779A (en:Method) 1971-01-26
FR2055543A5 (en:Method) 1971-05-07

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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