GB1275450A - Ionization smoke detecting device - Google Patents

Ionization smoke detecting device

Info

Publication number
GB1275450A
GB1275450A GB61769/69A GB6176969A GB1275450A GB 1275450 A GB1275450 A GB 1275450A GB 61769/69 A GB61769/69 A GB 61769/69A GB 6176969 A GB6176969 A GB 6176969A GB 1275450 A GB1275450 A GB 1275450A
Authority
GB
United Kingdom
Prior art keywords
electrodes
detecting device
smoke detecting
smoke
ionization smoke
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
GB61769/69A
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 GB1275450A publication Critical patent/GB1275450A/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
    • 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

Abstract

1275450 Smoke detectors NITTAN CO Ltd 18 Dec 1969 [24 Dec 1968] 61769/69 Heading G1N In an ionisation smoke detector a radio-active source 14 is located adjacent one of a pair of electrodes 11, 12, a grid electrode 13 being located between electrodes 11, 12, and all three electrodes being contained in a single ionisation chamber. A voltage E is applied across the two electrodes 11, 12 and upon smoke being present the potential at the electrode 13 changes to set off an alarm 17, via an amplifier 15. A unipolar current flows between electrodes 11 and 12.
GB61769/69A 1968-12-24 1969-12-18 Ionization smoke detecting device Expired GB1275450A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9418168 1968-12-24

Publications (1)

Publication Number Publication Date
GB1275450A true GB1275450A (en) 1972-05-24

Family

ID=14103142

Family Applications (1)

Application Number Title Priority Date Filing Date
GB61769/69A Expired GB1275450A (en) 1968-12-24 1969-12-18 Ionization smoke detecting device

Country Status (4)

Country Link
US (1) US3693009A (en)
DE (1) DE1964669A1 (en)
GB (1) GB1275450A (en)
NL (1) NL6918515A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926560A (en) * 1973-10-30 1975-12-16 Us Energy System for detecting gaseous contaminants in air
US4090308A (en) * 1975-08-04 1978-05-23 Aero-Dyne Manufacturing, Inc. Method and apparatus for signalling concentration of air conveyed ionizable foreign matter
FR2438841A1 (en) * 1978-10-13 1980-05-09 Commissariat Energie Atomique Ionic fire detection sensor - contains auxiliary electrode and applies intermediate voltage to ionised chamber screen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU48167A1 (en) * 1965-03-11 1966-09-12 Applic Electroniques Ets
US3560737A (en) * 1967-08-02 1971-02-02 Honeywell Inc Combustion products detector using a radioactive source and detector

Also Published As

Publication number Publication date
DE1964669A1 (en) 1970-07-02
NL6918515A (en) 1970-06-26
US3693009A (en) 1972-09-19

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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