FR2360881A1 - Ionic smoke detector with single radio active source - comprises central open measuring chamber with concentric peripheral reference chamber - Google Patents

Ionic smoke detector with single radio active source - comprises central open measuring chamber with concentric peripheral reference chamber

Info

Publication number
FR2360881A1
FR2360881A1 FR7623672A FR7623672A FR2360881A1 FR 2360881 A1 FR2360881 A1 FR 2360881A1 FR 7623672 A FR7623672 A FR 7623672A FR 7623672 A FR7623672 A FR 7623672A FR 2360881 A1 FR2360881 A1 FR 2360881A1
Authority
FR
France
Prior art keywords
chamber
smoke detector
single radio
comprises central
chambers
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.)
Withdrawn
Application number
FR7623672A
Other languages
French (fr)
Inventor
Georges Basset
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.)
ORTHOTRON
Original Assignee
ORTHOTRON
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 ORTHOTRON filed Critical ORTHOTRON
Priority to FR7623672A priority Critical patent/FR2360881A1/en
Publication of FR2360881A1 publication Critical patent/FR2360881A1/en
Withdrawn legal-status Critical Current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
    • 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

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

An ionic smoke detector comprises a measuring chamber which is identical to a sealed reference chamber. A single radioactive source irradiates both chambers which are concentric to reduce volume required. The detector comprises a chamber assembly (4) and a signal processing assembly (6). An open central chamber (8) forms the measuring chamber while a closed concentric peripheral chamber comprises the reference chamber (10). A plutonium radioactive source (12) irradiates both chambers and the differences in potential between the chambers are detected at electrodes (16, 18) for each chamber w. r. t. a common electrode (14). The chamber electrodes are connected into a Wheatshore bridge circuit and comparators activate alarm circuits.
FR7623672A 1976-08-03 1976-08-03 Ionic smoke detector with single radio active source - comprises central open measuring chamber with concentric peripheral reference chamber Withdrawn FR2360881A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7623672A FR2360881A1 (en) 1976-08-03 1976-08-03 Ionic smoke detector with single radio active source - comprises central open measuring chamber with concentric peripheral reference chamber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7623672A FR2360881A1 (en) 1976-08-03 1976-08-03 Ionic smoke detector with single radio active source - comprises central open measuring chamber with concentric peripheral reference chamber

Publications (1)

Publication Number Publication Date
FR2360881A1 true FR2360881A1 (en) 1978-03-03

Family

ID=9176492

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7623672A Withdrawn FR2360881A1 (en) 1976-08-03 1976-08-03 Ionic smoke detector with single radio active source - comprises central open measuring chamber with concentric peripheral reference chamber

Country Status (1)

Country Link
FR (1) FR2360881A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402208A1 (en) * 1977-08-31 1979-03-30 Emhart Ind SENSITIVITY CONTROLLED SMOKE DETECTOR BY IONIZATION
EP0015348A1 (en) * 1979-02-22 1980-09-17 UNIVERSAL DET (Société à responsabilité limitée) Fire detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2402208A1 (en) * 1977-08-31 1979-03-30 Emhart Ind SENSITIVITY CONTROLLED SMOKE DETECTOR BY IONIZATION
EP0015348A1 (en) * 1979-02-22 1980-09-17 UNIVERSAL DET (Société à responsabilité limitée) Fire detector

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Legal Events

Date Code Title Description
ST Notification of lapse