GB1217792A - Ionisation fire alarm - Google Patents

Ionisation fire alarm

Info

Publication number
GB1217792A
GB1217792A GB30892/69A GB3089269A GB1217792A GB 1217792 A GB1217792 A GB 1217792A GB 30892/69 A GB30892/69 A GB 30892/69A GB 3089269 A GB3089269 A GB 3089269A GB 1217792 A GB1217792 A GB 1217792A
Authority
GB
United Kingdom
Prior art keywords
wall
apertures
fire alarm
walls
chamber
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
GB30892/69A
Inventor
Andreas Scheidweiler
Peter R Muller
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.)
Cerberus AG
Original Assignee
Cerberus AG
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 Cerberus AG filed Critical Cerberus AG
Publication of GB1217792A publication Critical patent/GB1217792A/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
    • G08B17/113—Constructional details
    • 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
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (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

1,217,792. lonization chambers. CERBERUS A.G. 18 June, 1969 [18 June, 1968], No. 30892/69. Heading H1D. An open ionization chamber of a fire alarm, including a radio-active substance 8, 9 and two electrodes 3, 4, has an inner wall 5 having one or more apertures 11, 12 and an outer wall 6 of similar geometrical form having one or more apertures 10 so located that the lateral separation between the edges of apertures in the two walls is greater than the separation between the two walls. The flow of air through the chamber is thus reduced to a magnitude such that the ionization current is not affected. The inner wall 5 may form an electrode of the chamber, and the outer wall 6 may be removable. The apertures in wall 5 may consist wholly or in part of grids. In a modified arrangement (Figs. 3 and 4, not shown) the walls are of angular form approximating to the hemispherical. In a further modification (Fig. 5, not shown) the outer wall is formed by part of a trim member for the fire alarm and has a single large aperture.
GB30892/69A 1968-06-18 1969-06-18 Ionisation fire alarm Expired GB1217792A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH903568A CH475614A (en) 1968-06-18 1968-06-18 Ionization fire alarms

Publications (1)

Publication Number Publication Date
GB1217792A true GB1217792A (en) 1970-12-31

Family

ID=4347596

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30892/69A Expired GB1217792A (en) 1968-06-18 1969-06-18 Ionisation fire alarm

Country Status (11)

Country Link
US (1) US3731093A (en)
BE (1) BE734060A (en)
CH (1) CH475614A (en)
DE (1) DE1928874B2 (en)
DK (1) DK125938B (en)
FR (1) FR2011126A1 (en)
GB (1) GB1217792A (en)
HK (1) HK20378A (en)
IL (1) IL32330A (en)
NL (1) NL164407C (en)
SE (1) SE340971B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212657A (en) * 1987-12-26 1989-07-26 Hochiki Co Ionization smoke detector

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH551057A (en) * 1973-04-17 1974-06-28 Cerberus Ag IONIZATION ALARM.
US3903419A (en) * 1973-04-20 1975-09-02 Fire Alert Company Combustion products detector assembly and method of operation
CA1042564A (en) * 1974-04-18 1978-11-14 Kanji Ishii Ionization type smoke sensor
US3959788A (en) * 1974-05-10 1976-05-25 General Signal Corporation Ionization-type fire detector
US4044263A (en) * 1975-01-28 1977-08-23 Walter Kidde & Company, Inc. Ionization dual-zone static detector having single radioactive source
US4439683A (en) * 1981-02-11 1984-03-27 General Signal Corporation Ionization smoke detector
US4469953A (en) * 1982-02-02 1984-09-04 Nittan Company, Limited Combination ionization and photoelectric smoke detector
US4529976A (en) * 1982-10-29 1985-07-16 Frederick M. Jameson Smoke detector with masking shield
FR2594953B1 (en) * 1986-02-25 1989-05-05 Lewiner Jacques SMOKE DETECTOR WITH IONIZATION CHAMBER
US5485144A (en) * 1993-05-07 1996-01-16 Pittway Corporation Compensated ionization sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH416388A (en) * 1962-11-19 1966-06-30 Cerberus Ag Ionization fire alarm
US3514603A (en) * 1966-12-22 1970-05-26 Johnson Service Co Ionization chamber detection apparatus having a low voltage source means
US3560737A (en) * 1967-08-02 1971-02-02 Honeywell Inc Combustion products detector using a radioactive source and detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212657A (en) * 1987-12-26 1989-07-26 Hochiki Co Ionization smoke detector
GB2212657B (en) * 1987-12-26 1992-03-25 Hochiki Co Ionization smoke detector

Also Published As

Publication number Publication date
HK20378A (en) 1978-04-20
NL6909253A (en) 1969-12-22
US3731093A (en) 1973-05-01
BE734060A (en) 1969-11-17
DE1928874B2 (en) 1978-03-09
DK125938B (en) 1973-05-21
NL164407B (en) 1980-07-15
NL164407C (en) 1980-12-15
DE1928874A1 (en) 1970-01-02
CH475614A (en) 1969-07-15
IL32330A0 (en) 1969-08-27
SE340971B (en) 1971-12-06
IL32330A (en) 1972-04-27
FR2011126A1 (en) 1970-02-27

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