FR2402256A1 - Fire detector and alarm system - has two radioactive ionisation chambers connected to resistances to form wheatstone bridge - Google Patents

Fire detector and alarm system - has two radioactive ionisation chambers connected to resistances to form wheatstone bridge

Info

Publication number
FR2402256A1
FR2402256A1 FR7726238A FR7726238A FR2402256A1 FR 2402256 A1 FR2402256 A1 FR 2402256A1 FR 7726238 A FR7726238 A FR 7726238A FR 7726238 A FR7726238 A FR 7726238A FR 2402256 A1 FR2402256 A1 FR 2402256A1
Authority
FR
France
Prior art keywords
resistances
elements
alarm system
fire detector
wheatstone bridge
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.)
Granted
Application number
FR7726238A
Other languages
French (fr)
Other versions
FR2402256B1 (en
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.)
DEBARD ROBERT
Original Assignee
DEBARD ROBERT
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 DEBARD ROBERT filed Critical DEBARD ROBERT
Priority to FR7726238A priority Critical patent/FR2402256A1/en
Publication of FR2402256A1 publication Critical patent/FR2402256A1/en
Application granted granted Critical
Publication of FR2402256B1 publication Critical patent/FR2402256B1/fr
Granted 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

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The fire detector has two elements (1, 2) one for reference and the other for analysis. The impedances of these two elements (1, 2) vary in the presence of high temperature and/or radiation and/or combustion gases. The reference element is isolated completely or partially from the agents to be detected. The elements (1, 2) are mounted in series and form live adjacent branches of a Wheatstone bridge. The other two branches of the bridge have resistances (R1 R3) in them. In the diagonal connecting the common points (X, Y) of the resistances and the elements is an alarm system which is actuated when there is a voltage imbalance. The elements (1, 2) are ionisation chambers containing a radioactive material.
FR7726238A 1977-08-29 1977-08-29 Fire detector and alarm system - has two radioactive ionisation chambers connected to resistances to form wheatstone bridge Granted FR2402256A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7726238A FR2402256A1 (en) 1977-08-29 1977-08-29 Fire detector and alarm system - has two radioactive ionisation chambers connected to resistances to form wheatstone bridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7726238A FR2402256A1 (en) 1977-08-29 1977-08-29 Fire detector and alarm system - has two radioactive ionisation chambers connected to resistances to form wheatstone bridge

Publications (2)

Publication Number Publication Date
FR2402256A1 true FR2402256A1 (en) 1979-03-30
FR2402256B1 FR2402256B1 (en) 1982-05-21

Family

ID=9194835

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7726238A Granted FR2402256A1 (en) 1977-08-29 1977-08-29 Fire detector and alarm system - has two radioactive ionisation chambers connected to resistances to form wheatstone bridge

Country Status (1)

Country Link
FR (1) FR2402256A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015348A1 (en) * 1979-02-22 1980-09-17 UNIVERSAL DET (Société à responsabilité limitée) Fire detector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1354145A (en) * 1962-11-23 1964-03-06 Agostini Freres Et Cie Fire detection system
FR1453433A (en) * 1965-08-03 1966-06-03 Prot Incendie Soc Gen De Improvements to temperature detectors and the like, in particular for protection against fire, and devices for their implementation
US3320602A (en) * 1964-07-17 1967-05-16 Mc Graw Edison Co Fire detector systems having false alarm prevention
US3795904A (en) * 1970-05-16 1974-03-05 Preussag Ag Feuerschutz Fire alarm with ionization chamber

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1354145A (en) * 1962-11-23 1964-03-06 Agostini Freres Et Cie Fire detection system
US3320602A (en) * 1964-07-17 1967-05-16 Mc Graw Edison Co Fire detector systems having false alarm prevention
FR1453433A (en) * 1965-08-03 1966-06-03 Prot Incendie Soc Gen De Improvements to temperature detectors and the like, in particular for protection against fire, and devices for their implementation
US3795904A (en) * 1970-05-16 1974-03-05 Preussag Ag Feuerschutz Fire alarm with ionization chamber

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NV2328/75 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015348A1 (en) * 1979-02-22 1980-09-17 UNIVERSAL DET (Société à responsabilité limitée) Fire detector

Also Published As

Publication number Publication date
FR2402256B1 (en) 1982-05-21

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ST Notification of lapse