GB828121A - Apparatus responsive to the composition of a gaseous medium - Google Patents

Apparatus responsive to the composition of a gaseous medium

Info

Publication number
GB828121A
GB828121A GB2035/58A GB203558A GB828121A GB 828121 A GB828121 A GB 828121A GB 2035/58 A GB2035/58 A GB 2035/58A GB 203558 A GB203558 A GB 203558A GB 828121 A GB828121 A GB 828121A
Authority
GB
United Kingdom
Prior art keywords
anode
ionisation chamber
gas
gas flow
xxxvi
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
GB2035/58A
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.)
FRANCAIS DETECTION ELETR
Original Assignee
FRANCAIS DETECTION ELETR
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 FRANCAIS DETECTION ELETR filed Critical FRANCAIS DETECTION ELETR
Publication of GB828121A publication Critical patent/GB828121A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
    • H01J41/04—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of thermionic cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J41/00—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas; Discharge tubes for evacuation by diffusion of ions
    • H01J41/02—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas
    • H01J41/08—Discharge tubes for measuring pressure of introduced gas or for detecting presence of gas with ionisation by means of radioactive substances, e.g. alphatrons

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Electrochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Emergency Management (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Electron Tubes For Measurement (AREA)

Abstract

828,121. Discharge apparatus. DETECTION ELECTRONIQUE FRANCAISE D.E.F. Jan. 21, 1958 [Oct. 24, 1957], No. 2035/58. Class 39(1). [Also in Groups XXXVI and XL(b)] In gas testing apparatus a voltage is produced indicative of the variation in the composition of a gas flowing through a first ionisation chamber when compared with a reference gas in a second sealed ionisation chamber XXXVI) and (Groups XL(b). The first ionisation chamber 1, Fig. 1 comprises a cathode 8, a radioactive source 12, e.g. a radium salt emitting alpha particles, the intensity of which can be controlled by the screw 13 and which is heated by the filament 12 to prevent the formation of an emission interfering moisture film, an anode 9 and a screen grid 11 placed downstream of the anode and negatively polarised with respect to it to repel back to the anode any negative ions carried past it by the gas flow, hence rendering the device largely insensitive to the rate of gas flow. In a modification, Fig. 2, the first ionisation chamber is arranged symmetrically and includes a pair of radioactive sources 24 and 24b on one side and another pair of sources 25a and 25b on the other side of the anode 10. This arrangement renders the operation of the device insensitive to the rate of gas flow in either direction.
GB2035/58A 1957-10-24 1958-01-21 Apparatus responsive to the composition of a gaseous medium Expired GB828121A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1089193X 1957-10-24

Publications (1)

Publication Number Publication Date
GB828121A true GB828121A (en) 1960-02-17

Family

ID=9614212

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2035/58A Expired GB828121A (en) 1957-10-24 1958-01-21 Apparatus responsive to the composition of a gaseous medium

Country Status (6)

Country Link
US (1) US3028490A (en)
CH (1) CH349105A (en)
DE (1) DE1089193B (en)
FR (1) FR1185495A (en)
GB (1) GB828121A (en)
NL (1) NL224264A (en)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH380594A (en) * 1960-11-02 1964-07-31 Securiton Ag Ionization fire alarm system
DE1198712B (en) * 1961-12-30 1965-08-12 Danske Securitas As Electric alarm system
DE1194293B (en) * 1962-02-16 1965-06-03 Telefonbau Monitoring device with ionization chamber
US3322977A (en) * 1962-03-20 1967-05-30 Union Carbide Corp Thermionic conversion process and apparatus
US3244914A (en) * 1962-03-20 1966-04-05 Union Carbide Corp Thermoelectric conversion process and apparatus
US3304545A (en) * 1962-10-01 1967-02-14 Owen K Bell Combustion products detector
DE1279513B (en) * 1963-10-16 1968-10-03 Pour Applic Electroniques Ets Ionization detector whose ionization chamber is accessible to the atmosphere
US3361908A (en) * 1964-01-03 1968-01-02 Barber Colman Co Method and apparatus for electron attachment detection
US3423585A (en) * 1964-08-24 1969-01-21 Central Investment Corp Of Den System for detecting suspended colloidal solids in a gas utilizing an ionization chamber and a step-down amplifier
IL22673A (en) * 1964-12-27 1968-06-20 Jaffe A Sensitive smoke and fire detector
US3445757A (en) * 1965-10-14 1969-05-20 Mc Donnell Douglas Corp Capillary ionization gas detector and analyzer using timed interval current fluctuations
FR1480257A (en) * 1966-03-28 1967-05-12 Commissariat Energie Atomique Circulating ionization chamber
NO129270B (en) * 1970-05-16 1974-03-18 Preussag Ag Feuerschutz
CH521649A (en) * 1970-07-31 1972-04-15 Cerberus Ag Fire alarm device
JPS5737916B2 (en) * 1972-07-14 1982-08-12
FR2208150B1 (en) * 1972-11-29 1977-07-22 Hochiki Co
CH554033A (en) * 1973-04-03 1974-09-13 Cerberus Ag IOMIZATION FIRE DETECTION DEVICE.
US4021671A (en) * 1975-07-07 1977-05-03 Gulf & Western Manufacturing Company (Systems) Ionization detector
BE831296A (en) * 1975-07-11 1975-11-03 ION DETECTOR
US4013913A (en) * 1976-01-19 1977-03-22 Hnu Systems Inc. Ion detection electrode arrangement
US4099178A (en) * 1977-04-07 1978-07-04 Emdeko International, Inc. Test means for light responsive smoke detector
DE2724510C2 (en) * 1977-05-31 1985-04-11 Brunswick Corp., Skokie, Ill. Early warning fire alarm
US4177378A (en) * 1978-04-24 1979-12-04 Randam Electronics, Inc. Long-lived reference cell simulating the α scintillation of radon-222
US4271357A (en) * 1978-05-26 1981-06-02 Pye (Electronic Products) Limited Trace vapor detection
FR2430612A1 (en) * 1978-07-05 1980-02-01 Ugon Pierre Adjustable ionisation chamber for gas and smoke detectors - uses manoeuvrable arm to regulate radiation beam and so provide stable means of correction
FR2435766A1 (en) * 1978-09-11 1980-04-04 Commissariat Energie Atomique FIRE DETECTOR DEVELOPMENT
DE2846310C3 (en) * 1978-10-24 1982-01-28 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Fire alarm device for a room of great height and preferably large volume, in particular a warehouse or factory hall
US4345154A (en) * 1979-01-12 1982-08-17 The United States Of America As Represented By The Secretary Of The Army Bias-compensated, ionization sensor for gaseous media and method for attaining proper bias for same
US4338568A (en) * 1980-03-28 1982-07-06 Nasa Method and device for detection of a substance
JPS60135757A (en) * 1983-12-23 1985-07-19 Hochiki Corp Gas sensor
FR2594953B1 (en) * 1986-02-25 1989-05-05 Lewiner Jacques SMOKE DETECTOR WITH IONIZATION CHAMBER
US4770027A (en) * 1986-03-24 1988-09-13 Katuo Ehara Method of measuring concentrations of odors and a device therefor
GB2218806B (en) * 1988-05-18 1992-07-22 Newbow Eng Ind Ltd Device for testing pneumatic tyres
FR2746184B1 (en) * 1996-03-15 1998-06-05 SMOKE DETECTOR WITH ELECTRICAL IONIZATION OF AIR
US5926098A (en) * 1996-10-24 1999-07-20 Pittway Corporation Aspirated detector
RU2314833C1 (en) * 2006-11-07 2008-01-20 Элина Леонидовна Ладыченко Method of disinfecting air with negative oxygen ions and device for implementing the same
US7656302B2 (en) * 2006-11-20 2010-02-02 Honeywell International Inc. Sensing chamber with enhanced ambient atmospheric flow

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB389722A (en) * 1931-08-10 1933-03-23 Bbc Brown Boveri & Cie Improvements in and relating to the transmission of electrical energy between alternating current networks of different frequencies
CH199517A (en) * 1936-12-02 1938-08-31 C Jaeger Walter Method and device for displaying the state of a gas.
GB657548A (en) * 1947-12-15 1951-09-19 Electronic Instr Ltd Improvements in or relating to devices for testing gases
US2594777A (en) * 1950-07-14 1952-04-29 Ionics Ion controller
US2641710A (en) * 1951-03-02 1953-06-09 Shell Dev Radiological gas analysis
US2761976A (en) * 1951-04-17 1956-09-04 Illinois Testing Laboratories Methods and apparatus for measuring quantitatively the amount of gas in a mixture
US2702898A (en) * 1953-10-06 1955-02-22 Electro Watt Electrical And In Gas-responsive control apparatus
US2817768A (en) * 1954-09-16 1957-12-24 Tung Sol Electric Inc Radiation alarm
US2883555A (en) * 1956-05-28 1959-04-21 Curtiss Wright Corp Thickness measuring apparatus with compensation for atmospheric conditions

Also Published As

Publication number Publication date
US3028490A (en) 1962-04-03
DE1089193B (en) 1960-09-15
CH349105A (en) 1960-09-30
NL224264A (en)
FR1185495A (en) 1959-07-31

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