GB1144624A - Improvements in or relating to improved fire detection device - Google Patents
Improvements in or relating to improved fire detection deviceInfo
- Publication number
- GB1144624A GB1144624A GB5834/68A GB583468A GB1144624A GB 1144624 A GB1144624 A GB 1144624A GB 5834/68 A GB5834/68 A GB 5834/68A GB 583468 A GB583468 A GB 583468A GB 1144624 A GB1144624 A GB 1144624A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fire
- ionization
- transistor
- feb
- detection system
- 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
- 238000001514 detection method Methods 0.000 title abstract 3
- 230000005669 field effect Effects 0.000 abstract 1
- 239000002245 particle 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
- G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/12—Provision for actuation of an alarm
- G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
-
- 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
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fire-Detection Mechanisms (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
1,144,624. Fire detectors. VIGIFEU. Feb.6, 1968 [Feb.9, 1967], No. 5834/68. Heading G1N. [Also in Division G4] A fire detector comprises test and reference ionization chambers 3, 6 mounted in a housing 1 together with the associated circuitry including a temperature sensitive transistor mounted on a printed circuit board 11. Sampled air passes through a domed grid 2 and out via holes 1a in the body. In an alternative arrangement Fig.3 (not shown) the grid 2 may form the "wall electrode" of the ionization chamber. Detector circuit, Fig.2. The reference and sample ionization chambers 6, 3 are connected in series across a supply to vary the bias on the base of a (temperature sensitive) field effect transistor 14, whereby change in ionization due to smoke particles, or increase in temperature of the transistor, causes it to conduct and fire thyristor 16 energizing an alarm lamp 18. Zener diode 19 maintains the circuit for the detection system if the lamp fails. Fire detection system Fig.2 2 comprises a plurality of such detectors energized from a supply providing Π50 volts relative to earth through a three core cable. A broken cable is detected by a line relay 24 normally energized by current through line terminal resistance 22. Alarm relay 25 is actuated by increase in current when a fire detector operates.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR94266A FR1540305A (en) | 1967-02-09 | 1967-02-09 | Advanced fire detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1144624A true GB1144624A (en) | 1969-03-05 |
Family
ID=8625028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5834/68A Expired GB1144624A (en) | 1967-02-09 | 1968-02-06 | Improvements in or relating to improved fire detection device |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3582646A (en) |
| AT (1) | AT292510B (en) |
| BE (1) | BE710468A (en) |
| DE (1) | DE1616020B2 (en) |
| ES (1) | ES350324A1 (en) |
| FR (1) | FR1540305A (en) |
| GB (1) | GB1144624A (en) |
| NL (1) | NL161280C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107219548A (en) * | 2017-07-31 | 2017-09-29 | 四川省核工业地质调查院 | A kind of portable anti-Compton survey meter |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935492A (en) * | 1970-11-13 | 1976-01-27 | Nittan Company, Ltd. | Ionization smoke detector |
| US3832552A (en) * | 1973-06-22 | 1974-08-27 | Honeywell Inc | Dual chamber ionization smoke detector |
| FR2528980A1 (en) * | 1982-06-17 | 1983-12-23 | Pgep | IONIZATION LEVEL DETECTOR OF A GAS MEDIUM CONTROLLED BY ELECTRIC ARC |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL99411C (en) * | 1957-01-25 | |||
| CH355380A (en) * | 1957-10-30 | 1961-06-30 | Cerberus Gmbh | Device for determining changes in the composition of a gas |
| NL298945A (en) * | 1962-10-12 |
-
1967
- 1967-02-09 FR FR94266A patent/FR1540305A/en not_active Expired
-
1968
- 1968-02-06 US US703348A patent/US3582646A/en not_active Expired - Lifetime
- 1968-02-06 GB GB5834/68A patent/GB1144624A/en not_active Expired
- 1968-02-07 BE BE710468D patent/BE710468A/xx not_active IP Right Cessation
- 1968-02-09 ES ES350324A patent/ES350324A1/en not_active Expired
- 1968-02-09 NL NL6801899.A patent/NL161280C/en not_active IP Right Cessation
- 1968-02-09 AT AT126668A patent/AT292510B/en not_active IP Right Cessation
- 1968-02-09 DE DE19681616020 patent/DE1616020B2/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107219548A (en) * | 2017-07-31 | 2017-09-29 | 四川省核工业地质调查院 | A kind of portable anti-Compton survey meter |
| CN107219548B (en) * | 2017-07-31 | 2023-10-27 | 四川省核地质调查研究所 | Portable anti-Compton detector |
Also Published As
| Publication number | Publication date |
|---|---|
| AT292510B (en) | 1971-08-25 |
| BE710468A (en) | 1968-06-17 |
| US3582646A (en) | 1971-06-01 |
| NL161280B (en) | 1979-08-15 |
| FR1540305A (en) | 1968-09-27 |
| DE1616020A1 (en) | 1971-03-04 |
| DE1616020B2 (en) | 1976-02-12 |
| NL6801899A (en) | 1968-08-12 |
| ES350324A1 (en) | 1969-04-16 |
| NL161280C (en) | 1980-01-15 |
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