GB1430891A - Ionization fire sensors - Google Patents
Ionization fire sensorsInfo
- Publication number
- GB1430891A GB1430891A GB1684874A GB1684874A GB1430891A GB 1430891 A GB1430891 A GB 1430891A GB 1684874 A GB1684874 A GB 1684874A GB 1684874 A GB1684874 A GB 1684874A GB 1430891 A GB1430891 A GB 1430891A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- slit
- housing
- chamber
- air
- 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
- 241000202252 Cerberus Species 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 230000005865 ionizing radiation Effects 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 239000012811 non-conductive material Substances 0.000 abstract 1
- 239000012857 radioactive material Substances 0.000 abstract 1
- 239000000779 smoke Substances 0.000 abstract 1
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
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)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1430891 Ionisation detectors CERBERUS AG 17 April 1974 [17 April 1973] 16848/74 Heading H1D An ionization fire sensor 2 has an ionization chamber 10 with an ionizing radiation source 9 and electrodes 8, 11, so that the ion current changes in the presence of fire or smoke. Portions 4, 5 of the housing are separated by an annular slit 13 so formed as to deflect the flow of air through slit 13 to chamber 10 from its direct path. The portion 5 is removable for cleaning. Electrode 11 is an air-pervious grid or mesh preventing access to electrode 8. The sensor 2 is mounted on a portion 1. Air entering slit 13 is baffled by a wall 12 and passes through mesh electrode 11 into chamber 10, where it is ionized by radio-active material 9, e.g. americum 241. Current flowing between electrodes 8, 11 is detected by a circuit 14, which preferably includes an FET input transistor and is connected to an indicator lamp, such as an LED3. Optimum dimensions of the apparatus are given. The housing portions 4, 5 are made of non- conductive material, or preferably are of metal held at a voltage different from that of electrode 11 by a connection 11<SP>1</SP>. In a modification, Fig. 2, not shown, the housing (21) is made in one piece and is connected to a plate (26) so as to leave a substantially continuous annular gap between the parts.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH551973A CH551057A (en) | 1973-04-17 | 1973-04-17 | IONIZATION ALARM. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1430891A true GB1430891A (en) | 1976-04-07 |
Family
ID=4294978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1684874A Expired GB1430891A (en) | 1973-04-17 | 1974-04-17 | Ionization fire sensors |
Country Status (23)
| Country | Link |
|---|---|
| US (1) | US3908957A (en) |
| JP (1) | JPS49131798A (en) |
| BE (1) | BE813068A (en) |
| BR (1) | BR7403018D0 (en) |
| CA (1) | CA998783A (en) |
| CH (1) | CH551057A (en) |
| CS (1) | CS216229B2 (en) |
| DD (1) | DD111483A5 (en) |
| DE (1) | DE2415479C3 (en) |
| DK (1) | DK150415C (en) |
| ES (1) | ES424918A1 (en) |
| FI (1) | FI61768C (en) |
| FR (1) | FR2226714B1 (en) |
| GB (1) | GB1430891A (en) |
| HU (1) | HU175210B (en) |
| IL (1) | IL44507A (en) |
| IT (1) | IT1006402B (en) |
| NL (1) | NL177633C (en) |
| NO (1) | NO139581C (en) |
| PL (1) | PL90429B1 (en) |
| SE (1) | SE396491B (en) |
| YU (1) | YU35685B (en) |
| ZA (1) | ZA742077B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2117560A (en) * | 1982-03-09 | 1983-10-12 | Emile Hugon | Capacitive smoke detector |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2652970C3 (en) * | 1976-11-22 | 1979-09-06 | Hartwig Ing.(Grad.) 2409 Scharbeutz Beyersdorf | Ionization fire detectors |
| US4150373A (en) * | 1977-01-27 | 1979-04-17 | Ried Jr Louis | Ionization particle detector |
| JPS6234399Y2 (en) * | 1980-03-31 | 1987-09-02 | ||
| CH648943A5 (en) * | 1980-05-09 | 1985-04-15 | Cerberus Ag | SMOKE DETECTOR. |
| US4439683A (en) * | 1981-02-11 | 1984-03-27 | General Signal Corporation | Ionization smoke detector |
| US4488044A (en) * | 1981-11-20 | 1984-12-11 | Pittway Corporation | Ionization chamber for smoke detector and the like |
| US4529976A (en) * | 1982-10-29 | 1985-07-16 | Frederick M. Jameson | Smoke detector with masking shield |
| JPH044316Y2 (en) * | 1985-09-30 | 1992-02-07 | ||
| FR2594953B1 (en) * | 1986-02-25 | 1989-05-05 | Lewiner Jacques | SMOKE DETECTOR WITH IONIZATION CHAMBER |
| JPS63239592A (en) * | 1987-03-27 | 1988-10-05 | ホーチキ株式会社 | Photoelectric type smoke sensor |
| DE58905587D1 (en) * | 1988-03-30 | 1993-10-21 | Cerberus Ag | Early fire detection procedures. |
| US5327119A (en) * | 1989-12-22 | 1994-07-05 | Hochiki Kabushiki Kaisha | Ionizing smoke sensor |
| CH681932A5 (en) * | 1990-12-04 | 1993-06-15 | Cerberus Ag | |
| JPH07506671A (en) * | 1992-05-14 | 1995-07-20 | ビジョン システムズ インコーポレイティド | Gas sampling tip for smoke/pollution detection systems |
| AU667102B2 (en) * | 1992-05-14 | 1996-03-07 | Vision Systems Limited | Gas sampling point for smoke/pollution detection systems |
| US5856784A (en) * | 1997-04-23 | 1999-01-05 | Pittway Corporation | Low profile ionization chamber |
| US6057774A (en) * | 1999-01-21 | 2000-05-02 | Brk Brands, Inc. | Smoke alarm with anti-dust screen |
| GB0213854D0 (en) * | 2002-06-15 | 2002-07-24 | Aea Technology Plc | Radioactive sources |
| US9013316B2 (en) * | 2011-07-28 | 2015-04-21 | Finsecur | Smoke detector |
| GB201219488D0 (en) | 2012-10-30 | 2012-12-12 | Univ Sussex | Apparatus for sensing ionic current and ionising radiation |
| ES3035017A1 (en) * | 2024-02-23 | 2025-08-27 | Detnov Security S L | PARTICLE SEPARATING DEVICE FOR FIRE DETECTORS (Machine-translation by Google Translate, not legally binding) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3319069A (en) * | 1964-08-27 | 1967-05-09 | American District Telegraph Co | Smoke detecting radiation sensitive fire alarm system |
| CH475614A (en) * | 1968-06-18 | 1969-07-15 | Cerberus Ag Werke Fuer Elektro | Ionization fire alarms |
| GB1277091A (en) * | 1968-07-11 | 1972-06-07 | Nittan Co Ltd | Ionization type smoke detectors |
| CH491449A (en) * | 1969-05-19 | 1970-05-31 | Cerberus Ag | Smoke detector arrangement with at least one smoke measuring chamber |
| CH486082A (en) * | 1969-05-19 | 1970-02-15 | Cerberus Ag | Ionization fire alarms |
| CH508251A (en) * | 1970-07-23 | 1971-05-31 | Cerberus Ag | Ionization fire alarms |
| US3728706A (en) * | 1970-09-28 | 1973-04-17 | Gen Signal Corp | System for indicating aerosols in the atmosphere |
| BE793205A (en) * | 1971-12-30 | 1973-04-16 | Preussag Ag Feuerschutz | IONIZATION FIRE ALARM |
-
1973
- 1973-04-17 CH CH551973A patent/CH551057A/en not_active IP Right Cessation
-
1974
- 1974-03-27 IL IL44507A patent/IL44507A/en unknown
- 1974-03-29 YU YU891/74A patent/YU35685B/en unknown
- 1974-03-29 BE BE142655A patent/BE813068A/en not_active IP Right Cessation
- 1974-03-29 DE DE2415479A patent/DE2415479C3/en not_active Expired
- 1974-04-01 FR FR7411564A patent/FR2226714B1/fr not_active Expired
- 1974-04-02 ZA ZA00742077A patent/ZA742077B/en unknown
- 1974-04-03 ES ES424918A patent/ES424918A1/en not_active Expired
- 1974-04-03 JP JP49037056A patent/JPS49131798A/ja active Pending
- 1974-04-04 US US457841A patent/US3908957A/en not_active Expired - Lifetime
- 1974-04-08 NL NLAANVRAGE7404783,A patent/NL177633C/en not_active IP Right Cessation
- 1974-04-09 IT IT7421073A patent/IT1006402B/en active
- 1974-04-10 SE SE7404871A patent/SE396491B/en not_active IP Right Cessation
- 1974-04-11 FI FI1124/74A patent/FI61768C/en active
- 1974-04-11 CA CA197,527A patent/CA998783A/en not_active Expired
- 1974-04-12 CS CS742663A patent/CS216229B2/en unknown
- 1974-04-15 DD DD177896A patent/DD111483A5/xx unknown
- 1974-04-16 NO NO741357A patent/NO139581C/en unknown
- 1974-04-16 PL PL1974170389A patent/PL90429B1/pl unknown
- 1974-04-16 DK DK208174A patent/DK150415C/en not_active IP Right Cessation
- 1974-04-16 BR BR3018/74A patent/BR7403018D0/en unknown
- 1974-04-17 HU HU74CE995A patent/HU175210B/en unknown
- 1974-04-17 GB GB1684874A patent/GB1430891A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2117560A (en) * | 1982-03-09 | 1983-10-12 | Emile Hugon | Capacitive smoke detector |
Also Published As
| Publication number | Publication date |
|---|---|
| IL44507A0 (en) | 1974-06-30 |
| CS216229B2 (en) | 1982-10-29 |
| ES424918A1 (en) | 1976-05-16 |
| FR2226714B1 (en) | 1979-03-16 |
| JPS49131798A (en) | 1974-12-17 |
| DK150415C (en) | 1987-07-13 |
| BE813068A (en) | 1974-07-15 |
| CH551057A (en) | 1974-06-28 |
| NL177633C (en) | 1985-10-16 |
| FR2226714A1 (en) | 1974-11-15 |
| DK150415B (en) | 1987-02-23 |
| NL7404783A (en) | 1974-10-21 |
| DE2415479A1 (en) | 1974-11-14 |
| NO139581B (en) | 1978-12-27 |
| SE396491B (en) | 1977-09-19 |
| HU175210B (en) | 1980-06-28 |
| BR7403018D0 (en) | 1974-11-19 |
| NL177633B (en) | 1985-05-17 |
| PL90429B1 (en) | 1977-01-31 |
| CA998783A (en) | 1976-10-19 |
| FI61768B (en) | 1982-05-31 |
| NO139581C (en) | 1979-04-04 |
| NO741357L (en) | 1974-10-18 |
| IL44507A (en) | 1977-07-31 |
| AU6753274A (en) | 1975-10-09 |
| YU35685B (en) | 1981-04-30 |
| YU89174A (en) | 1980-09-25 |
| US3908957A (en) | 1975-09-30 |
| ZA742077B (en) | 1975-04-30 |
| DD111483A5 (en) | 1975-02-12 |
| DE2415479C3 (en) | 1987-12-03 |
| DE2415479B2 (en) | 1980-09-04 |
| IT1006402B (en) | 1976-09-30 |
| FI61768C (en) | 1982-09-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |