GB810062A - A device to detect smoke - Google Patents

A device to detect smoke

Info

Publication number
GB810062A
GB810062A GB31306/56A GB3130656A GB810062A GB 810062 A GB810062 A GB 810062A GB 31306/56 A GB31306/56 A GB 31306/56A GB 3130656 A GB3130656 A GB 3130656A GB 810062 A GB810062 A GB 810062A
Authority
GB
United Kingdom
Prior art keywords
chamber
gas
triode
trigger
difference
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
GB31306/56A
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.)
MAURICE ELIE NAHMIAS
Original Assignee
MAURICE ELIE NAHMIAS
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 MAURICE ELIE NAHMIAS filed Critical MAURICE ELIE NAHMIAS
Publication of GB810062A publication Critical patent/GB810062A/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
    • G01N27/66—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 and measuring current or voltage
    • 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

Abstract

810,062. Detecting smoke by radioactive ionization. NAHMIAS, M. E. Oct. 5, 1956 [April 6, 1956], No. 31306/56. Class 40 (3). A device for detecting smoke comprises a single rigidly supported source of alpha particles which ionizes to different degrees gases contained in two chambers, and means sensitive to the difference between the currents passed in each chamber. A metal housing comprises a chamber I containing an insulated alpha particle source 8 on a sliding metal stem 5 and an electrode E1 of potential +V1 and a chamber II containing an insulated electrode E2 of negative potential - V2 which are separated by one or two thin foils M supported between grids in a central circular aperture in plates x1 x2. Vents o1, o2 in chamber I allow circulation of ambient air. The ionization current of chamber I is set higher than that of chamber II and the difference 13 between them is such that the voltage across resistance R (to which the housing is connected by spring L) V3 (=RI3) is smaller than the voltage required to trigger the cold triode 6. Gas to be monitored passes through chamber II decreasing the current therein and increasing I3 and V3 so as to trigger the triode and energize relay E to operate buzzer B. The gas may be continuously monitored from a remote point at the side walls of chamber II perforated to monitor ambient gas. Specification 638,833 is referred to.
GB31306/56A 1956-04-06 1956-10-15 A device to detect smoke Expired GB810062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR810062X 1956-04-06

Publications (1)

Publication Number Publication Date
GB810062A true GB810062A (en) 1959-03-11

Family

ID=9254163

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31306/56A Expired GB810062A (en) 1956-04-06 1956-10-15 A device to detect smoke

Country Status (2)

Country Link
GB (1) GB810062A (en)
NL (1) NL99092C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3378725A (en) * 1964-04-15 1968-04-16 Beckman Instruments Inc Electron capture detector having separate ionization and sensing regions
US4041376A (en) * 1973-11-06 1977-08-09 The Furukawa Electric Co., Ltd. Detector for detecting the state of electrically non-conductive or substantially electrically non conductive fluid
US4053825A (en) * 1974-07-22 1977-10-11 General Electric Company Ionization chamber type gas leak detector operating in the high voltage avalanche region
US5153520A (en) * 1984-10-03 1992-10-06 Dumbeck Robert F Identifying and quantifying the presence of alpha radiation and specific gaseous molecules present in air samples
CN105074448A (en) * 2013-01-31 2015-11-18 蒙特利尔史密斯安检仪公司 Surface ionization source

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3378725A (en) * 1964-04-15 1968-04-16 Beckman Instruments Inc Electron capture detector having separate ionization and sensing regions
US4041376A (en) * 1973-11-06 1977-08-09 The Furukawa Electric Co., Ltd. Detector for detecting the state of electrically non-conductive or substantially electrically non conductive fluid
US4053825A (en) * 1974-07-22 1977-10-11 General Electric Company Ionization chamber type gas leak detector operating in the high voltage avalanche region
US5153520A (en) * 1984-10-03 1992-10-06 Dumbeck Robert F Identifying and quantifying the presence of alpha radiation and specific gaseous molecules present in air samples
CN105074448A (en) * 2013-01-31 2015-11-18 蒙特利尔史密斯安检仪公司 Surface ionization source

Also Published As

Publication number Publication date
NL99092C (en)

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