GB1341372A - Smoke detector - Google Patents
Smoke detectorInfo
- Publication number
- GB1341372A GB1341372A GB4831572A GB4831572A GB1341372A GB 1341372 A GB1341372 A GB 1341372A GB 4831572 A GB4831572 A GB 4831572A GB 4831572 A GB4831572 A GB 4831572A GB 1341372 A GB1341372 A GB 1341372A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wall
- housing
- cover
- chamber
- membrane
- 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
Links
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Toxicology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
1341372 Ionization chambers BEVAKNINGS AB SECURITAS 20 Oct 1972 [20 Oct 1971] 48315/72 Heading H1D In a smoke detector formed by a first ionization chamber which contains a source of ionizing radiation, is located within a housing, and is separated from a second ionization chamber, in communication with the ambient atmosphere, by a common wall transparent to the radiation emitted by the source, the second chamber is defined by an apertured cover which is removably secured to the housing and which is adapted to receive the wall, whereby the wall, when contaminated, is removable with the cover from the housing, to permit replacement by clean parts. As shown, the housing 1 contains an electrode 2 and a flange for the receipt of an insert 6 supporting an aluminium tube 8 containing a radioactive isotope, e.g. krypton 85 or argon 39. The wall 9 is in the form of a membrane, e.g. aluminium foil, which constitutes a common electrode for the two chambers, and which may be secured by adhesive to a holder 12 which is itself secured to an apertured cover 16 forming the wall and second electrode of the second chamber. The cover 6 may be of metal or metallized plastics. The gaseous isotope container, instead of tube 8, may be formed the membrane 9 together with a second, smaller membrane (19, Fig. 8, not shown) sealed thereto.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE13304/71A SE347377B (en) | 1971-10-20 | 1971-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1341372A true GB1341372A (en) | 1973-12-19 |
Family
ID=20297181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4831572A Expired GB1341372A (en) | 1971-10-20 | 1972-10-20 | Smoke detector |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3838283A (en) |
| BE (1) | BE790355A (en) |
| DE (1) | DE2250820A1 (en) |
| FR (1) | FR2175383A5 (en) |
| GB (1) | GB1341372A (en) |
| NL (1) | NL7214138A (en) |
| NO (1) | NO126977B (en) |
| SE (1) | SE347377B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2240214A (en) * | 1989-12-25 | 1991-07-24 | Hochiki Co | Ionization-type smoke sensor |
| GB2278719A (en) * | 1993-05-17 | 1994-12-07 | Kilsen Sa | Ionisation smoke detector |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4075487A (en) * | 1976-05-14 | 1978-02-21 | Patent Development & Management Company | Ionization chamber assembly |
| DE2652970C3 (en) * | 1976-11-22 | 1979-09-06 | Hartwig Ing.(Grad.) 2409 Scharbeutz Beyersdorf | Ionization fire detectors |
| US4238679A (en) * | 1978-12-07 | 1980-12-09 | Conrac Corporation | Dual-chamber ionization smoke detector assembly |
| FR2473201A1 (en) * | 1980-01-02 | 1981-07-10 | Gamma Electronic | CAPACITIVE SMOKE DETECTOR WITH LOW IONIZATION SOURCE |
| DE9416314U1 (en) | 1994-10-10 | 1994-12-01 | Fritz Fuss Gmbh & Co, 72458 Albstadt | smoke detector |
| DE19627620C1 (en) * | 1996-07-09 | 1997-11-13 | Bruker Saxonia Analytik Gmbh | Electron capture detector for gas chromatography |
| US20050218811A1 (en) * | 2004-03-31 | 2005-10-06 | Schulman Michael B | Gas discharge lamp with high-energy vacuum ultraviolet emission |
| WO2005098413A1 (en) * | 2004-03-31 | 2005-10-20 | Mine Safety Appliances Company | Photoionization detector |
| US7504962B2 (en) * | 2005-11-22 | 2009-03-17 | Joseph Stephen Smith | Apparatus for enclosing a smoke detector |
| CN100414291C (en) * | 2006-03-17 | 2008-08-27 | 中国科学院安徽光学精密机械研究所 | Portable ionization chamber of photoionization detector |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS446089Y1 (en) * | 1966-03-30 | 1969-03-05 | ||
| DE2029485B2 (en) * | 1969-06-21 | 1971-11-25 | Nittan Co. Ltd., Tokio | IONIZATION SMOKE SENSORS |
| ZA704724B (en) * | 1969-07-22 | 1971-03-31 | Nittan Co Ltd | Ionization smoke detector |
-
0
- BE BE790355D patent/BE790355A/en unknown
-
1971
- 1971-10-20 SE SE13304/71A patent/SE347377B/xx unknown
-
1972
- 1972-10-17 DE DE2250820A patent/DE2250820A1/en active Pending
- 1972-10-18 US US00298750A patent/US3838283A/en not_active Expired - Lifetime
- 1972-10-19 NL NL7214138A patent/NL7214138A/xx not_active Application Discontinuation
- 1972-10-20 FR FR7237286A patent/FR2175383A5/fr not_active Expired
- 1972-10-20 GB GB4831572A patent/GB1341372A/en not_active Expired
- 1972-10-28 NO NO03746/72*[A patent/NO126977B/no unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2240214A (en) * | 1989-12-25 | 1991-07-24 | Hochiki Co | Ionization-type smoke sensor |
| GB2240214B (en) * | 1989-12-25 | 1994-08-24 | Hochiki Co | Ionization-type smoke sensor |
| GB2278719A (en) * | 1993-05-17 | 1994-12-07 | Kilsen Sa | Ionisation smoke detector |
| ES2070748A2 (en) * | 1993-05-17 | 1995-06-01 | Kilsen Sa | Ionisation smoke detector |
| GB2278719B (en) * | 1993-05-17 | 1997-03-26 | Kilsen Sa | Ionic smoke detector |
Also Published As
| Publication number | Publication date |
|---|---|
| BE790355A (en) | 1973-02-15 |
| NO126977B (en) | 1973-04-16 |
| FR2175383A5 (en) | 1973-10-19 |
| US3838283A (en) | 1974-09-24 |
| NL7214138A (en) | 1973-04-25 |
| DE2250820A1 (en) | 1973-04-26 |
| SE347377B (en) | 1972-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLE | Entries relating assignments, transmissions, licences in the register of patents | ||
| PCNP | Patent ceased through non-payment of renewal fee |