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 chamberInfo
- 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- Withdrawn
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.
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)
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 |
-
1976
- 1976-08-03 FR FR7623672A patent/FR2360881A1/en not_active Withdrawn
Cited By (2)
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 |