GB1088836A - Improvements in or relating to detectors of gases, vapours or smoke - Google Patents

Improvements in or relating to detectors of gases, vapours or smoke

Info

Publication number
GB1088836A
GB1088836A GB4515864A GB4515864A GB1088836A GB 1088836 A GB1088836 A GB 1088836A GB 4515864 A GB4515864 A GB 4515864A GB 4515864 A GB4515864 A GB 4515864A GB 1088836 A GB1088836 A GB 1088836A
Authority
GB
United Kingdom
Prior art keywords
tube
ionization chamber
cold cathode
starter
common
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
GB4515864A
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.)
APPLIC ELECTRONIQUES ETS
Original Assignee
APPLIC ELECTRONIQUES ETS
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 APPLIC ELECTRONIQUES ETS filed Critical APPLIC ELECTRONIQUES ETS
Publication of GB1088836A publication Critical patent/GB1088836A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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

Landscapes

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

Abstract

1,088,836. Smoke detectors. ETABLISSEMENT POUR APPLICATIONS ELECTRONIQUES. Nov. 5, 1964 [Nov. 6, 1963], No. 45158/64. Heading G1N. A detector of gases, vapour or smoke comprises an ionization chamber containing a radioactive source forming one limb of a potential dividing network which is adjustable to vary the sensitivity of the device and also a capacitor variable to adjust the time constant. The radioactive source and the collector electrodes may be separately adjustable in the ionization chamber Fig. 3 (not shown) which may contain accelerating electrodes between the two. The potential dividing network is connected to the starter electrode of a cold cathode tube and provided, as shown, with an H. T. supply adjustable to vary the firing point of the system. The variable capacitor is connected between the starter electrode and the cathode. The striking of the tube may operate a relay. Two such systems may be arranged with their ionization chambers disposed to collect and respond to lighter-than-air and heavier-than-air components respectively, the two cold cathode tubes being connected to a relay in a common cathode circuit Fig. 5 (not shown). Alternatively the ionization chamber circuits can be connected to a single tube with separate starters Fig. 6 (not shown). As another alternative the common cathode circuit of two tubes may contain a resistance and the voltage developed across it may fire another cold cathode tube Fig. 7 (not shown). A number of such systems in different locations may be connected as a counter chain so that the number of impulses transmitted is a measure of which detector has fired. The potential dividing network which provides the starter potential may contain thermistors so that the system is sensitive to temperature changes also Fig. 8 (not shown). Alternatively the thermistors may form a separate network, the output from which is amplified by a transistor before application to the starter Fig. 9 (not shown). The temperature sensitive and ionization chamber networks may be connected to separate cold cathode tubes Fig.10 (not shown) but these in turn, may be coupled to a common tube Fig.11 (not shown). The common tube may be made to respond also to the amplified output from a photo-cell so that the system is light-sensitive also.
GB4515864A 1963-11-06 1964-11-05 Improvements in or relating to detectors of gases, vapours or smoke Expired GB1088836A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU44761 1963-11-06

Publications (1)

Publication Number Publication Date
GB1088836A true GB1088836A (en) 1967-10-25

Family

ID=19723549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4515864A Expired GB1088836A (en) 1963-11-06 1964-11-05 Improvements in or relating to detectors of gases, vapours or smoke

Country Status (3)

Country Link
CH (1) CH445344A (en)
GB (1) GB1088836A (en)
LU (1) LU44761A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946374A (en) * 1970-08-13 1976-03-23 Sci Systems, Inc. Rate-of-change combustion and contamination detection device
US4224611A (en) * 1977-03-25 1980-09-23 Muenstedt Wolfgang Smoke alarm station

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946374A (en) * 1970-08-13 1976-03-23 Sci Systems, Inc. Rate-of-change combustion and contamination detection device
US4224611A (en) * 1977-03-25 1980-09-23 Muenstedt Wolfgang Smoke alarm station

Also Published As

Publication number Publication date
LU44761A1 (en) 1965-05-06
CH445344A (en) 1967-10-15

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