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GB1215814A - Ionization chamber detection apparatus. - Google Patents

Ionization chamber detection apparatus.

Info

Publication number
GB1215814A
GB1215814A GB57679/67A GB5767967A GB1215814A GB 1215814 A GB1215814 A GB 1215814A GB 57679/67 A GB57679/67 A GB 57679/67A GB 5767967 A GB5767967 A GB 5767967A GB 1215814 A GB1215814 A GB 1215814A
Authority
GB
United Kingdom
Prior art keywords
smoke
detection apparatus
ionization chamber
voltage
triac
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
GB57679/67A
Inventor
Carl Frederick Klein
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.)
Johnson Service Co
Original Assignee
Johnson Service Co
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 Johnson Service Co filed Critical Johnson Service Co
Publication of GB1215814A publication Critical patent/GB1215814A/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
    • 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
    • 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)
  • Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Emergency Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

1,215,814. Fire alarms. JOHNSON SERVICE CO. 19 Dec., 1967 [22 Dec., 1966], No. 57679/67. Heading G4N. [Also in Divisions G1, H1 and H3] In an ionization chamber detection apparatus in which two series connected ionization chambers 13, 14 (see Division H1) and an F.E.T. amplifier 11 are powered from the same low voltage supply 3 (10 v.-35 v.), the voltage at point 12 between the two ionization chambers 13, 14, one of which 14 is sensitive to the presence of smoke in the atmosphere e.g. from a fire and the other 13 is closed to the atmosphere, is applied to the control electrodes 18, 19 of F.E.T. 11. The F.E.T. 11 is arranged to be non- conductive in the absence of smoke but when the voltage at point 12 changes, due to the presence of smoke, the F.E.T. 11 conducts completing the power supply to unijunction transistor oscillator 9. Firing pulses are thus applied to the gate 8 of a Triac 7 over transformer 10 to cause the Triac to conduct and energize an audible alarm 6.
GB57679/67A 1966-12-22 1967-12-19 Ionization chamber detection apparatus. Expired GB1215814A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60405866A 1966-12-22 1966-12-22

Publications (1)

Publication Number Publication Date
GB1215814A true GB1215814A (en) 1970-12-16

Family

ID=24418013

Family Applications (1)

Application Number Title Priority Date Filing Date
GB57679/67A Expired GB1215814A (en) 1966-12-22 1967-12-19 Ionization chamber detection apparatus.

Country Status (4)

Country Link
US (1) US3514603A (en)
DE (1) DE1589987A1 (en)
FR (1) FR1549823A (en)
GB (1) GB1215814A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH475614A (en) * 1968-06-18 1969-07-15 Cerberus Ag Werke Fuer Elektro Ionization fire alarms
GB1277091A (en) * 1968-07-11 1972-06-07 Nittan Co Ltd Ionization type smoke detectors
USRE30323E (en) * 1968-09-26 1980-07-01 Hochiki Kabushiki Kaisha Smoke detector adapted to a smoke sensing apparatus
CH497755A (en) * 1969-06-24 1970-10-15 Cerberus Ag Ionization fire alarms
US3935492A (en) * 1970-11-13 1976-01-27 Nittan Company, Ltd. Ionization smoke detector
US3792254A (en) * 1971-07-15 1974-02-12 Vigifeu Ionization chamber in particular for a fire detection device
US3903419A (en) * 1973-04-20 1975-09-02 Fire Alert Company Combustion products detector assembly and method of operation
US4021671A (en) * 1975-07-07 1977-05-03 Gulf & Western Manufacturing Company (Systems) Ionization detector
US4150373A (en) * 1977-01-27 1979-04-17 Ried Jr Louis Ionization particle detector
CN108776351B (en) * 2018-06-14 2024-10-29 山东中测校准质控技术有限公司 Well-type ionization chamber for measuring activity of radioactive source

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH355380A (en) * 1957-10-30 1961-06-30 Cerberus Gmbh Device for determining changes in the composition of a gas
US3271756A (en) * 1960-03-22 1966-09-06 Harold J Burke Method and apparatus for detecting a hazardous condition
DK101900C (en) * 1961-12-30 1965-06-08 Danske Securitas As Electrical alarm system, preferably for fire alarm.

Also Published As

Publication number Publication date
FR1549823A (en) 1968-12-13
DE1589987A1 (en) 1971-04-01
US3514603A (en) 1970-05-26

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