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GB1259437A - - Google Patents

Info

Publication number
GB1259437A
GB1259437A GB1259437DA GB1259437A GB 1259437 A GB1259437 A GB 1259437A GB 1259437D A GB1259437D A GB 1259437DA GB 1259437 A GB1259437 A GB 1259437A
Authority
GB
United Kingdom
Prior art keywords
ionization
gate
drain
ionization chamber
nittan
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
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 filed Critical
Publication of GB1259437A publication Critical patent/GB1259437A/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

Landscapes

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

Abstract

1,259,437. Ionization gas detectors. NITTAN CO. Ltd. Feb. 24, 1970 [April 25, 1969], No. 8946/70. G1N. In an ionization smoke detector a single ionization chamber 8 is connected to the gate of a FET 14 whose source-drain path is connected across a voltage supply. The leakage impedance between the gate and drain eletrodes then serves as a high resistor (normally provided by a reference ionization chamber). Sensitivity control and operation testing may be provided by a potentiometer 28.
GB1259437D 1969-04-25 1970-02-24 Expired GB1259437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44031475A JPS529998B1 (en) 1969-04-25 1969-04-25

Publications (1)

Publication Number Publication Date
GB1259437A true GB1259437A (en) 1972-01-05

Family

ID=12332275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1259437D Expired GB1259437A (en) 1969-04-25 1970-02-24

Country Status (5)

Country Link
US (1) US3676678A (en)
JP (1) JPS529998B1 (en)
DE (1) DE2019791B2 (en)
GB (1) GB1259437A (en)
NL (1) NL7002577A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2711457C2 (en) * 1977-03-16 1985-06-27 Siemens AG, 1000 Berlin und 8000 München Ionization fire detector
EP0011364B1 (en) * 1978-09-29 1983-05-18 Chubb Fire Limited Heat detector circuit
ZA786519B (en) * 1978-11-20 1980-02-27 Anglo Amer Corp South Africa Detector
DE3904979A1 (en) * 1989-02-18 1990-08-23 Beyersdorf Hartwig METHOD FOR OPERATING AN IONIZATION SMOKE DETECTOR AND IONIZATION SMOKE DETECTOR
US5189399A (en) * 1989-02-18 1993-02-23 Hartwig Beyersdorf Method of operating an ionization smoke alarm and ionization smoke alarm
EP0423489A1 (en) * 1989-09-15 1991-04-24 Cerberus Ag Smoke detection arrangement with monitoring
US6683319B1 (en) 2001-07-17 2004-01-27 Mitec Incorporated System and method for irradiation with improved dosage uniformity

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE2019791A1 (en) 1970-11-05
US3676678A (en) 1972-07-11
JPS529998B1 (en) 1977-03-19
NL7002577A (en) 1970-10-27
DE2019791B2 (en) 1972-03-30

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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