GB1255221A - Improvements in or relating to an alarm device and a supervising installation including said device - Google Patents
Improvements in or relating to an alarm device and a supervising installation including said deviceInfo
- Publication number
- GB1255221A GB1255221A GB6224/69A GB622469A GB1255221A GB 1255221 A GB1255221 A GB 1255221A GB 6224/69 A GB6224/69 A GB 6224/69A GB 622469 A GB622469 A GB 622469A GB 1255221 A GB1255221 A GB 1255221A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alarm
- counter
- generator
- radiation
- thyristor
- 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
- 238000009434 installation Methods 0.000 title 1
- 230000005855 radiation Effects 0.000 abstract 3
- 238000001514 detection method Methods 0.000 abstract 2
- 238000007598 dipping method Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- 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
- G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Fire-Detection Mechanisms (AREA)
- Alarm Systems (AREA)
Abstract
1,255,221. Radiation detection. LA DETECTION ELECTRONIQUE FRANCAISE. Feb. 5, 1969 [Feb. 15, 1968], No. 6224/69. Heading G1A. Radiation incident on a tube detector 1 renders its conductive so that pulses from a generator 6 pass to a counter 10 which counter comprised three flip-flops 11-13 and which applies on signal to all the lines and to "AND" gate 19 when it is full, releasing relay 8 through a thyristor 21 to operate an alarm 23 and interrupting the pulse supply through contact 7. The alarm 23 indicates the presence of radiation which may be nuclear, or ultraviolet from a fire. The counter is reset by a second generator 18 having a different frequency. In a modification, Fig. 3 (not shown) a thyristor is activated by the output from a four stage counter. A system in which a number of alarm circuits are fed from a common pulse generator to operate a common alarm is also described. The pulse generators may comprise a rectifier bridge having a string of Zener diodes across and dipping its output.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR139945 | 1968-02-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1255221A true GB1255221A (en) | 1971-12-01 |
Family
ID=8646019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6224/69A Expired GB1255221A (en) | 1968-02-15 | 1969-02-05 | Improvements in or relating to an alarm device and a supervising installation including said device |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US3621262A (en) |
| AT (1) | AT293920B (en) |
| BE (1) | BE727699A (en) |
| CA (1) | CA929251A (en) |
| CH (1) | CH486746A (en) |
| DE (1) | DE1906075C3 (en) |
| ES (1) | ES363669A1 (en) |
| FR (1) | FR1565498A (en) |
| GB (1) | GB1255221A (en) |
| NL (1) | NL164981C (en) |
| SE (1) | SE344254B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1353615A (en) * | 1970-08-11 | 1974-05-22 | Prucill P M | Fire detection systems |
| JPS5136119B1 (en) * | 1971-04-15 | 1976-10-06 | ||
| JPS5512635B2 (en) * | 1972-07-26 | 1980-04-03 | ||
| US3775762A (en) * | 1972-09-15 | 1973-11-27 | Us Air Force | Gas multiplication ultraviolet detector system for fire detection |
| FR2257118B1 (en) * | 1974-01-04 | 1976-11-26 | Commissariat Energie Atomique | |
| JPS5231699A (en) * | 1975-07-25 | 1977-03-10 | Hochiki Corp | Fire senser |
| DE2614487C2 (en) * | 1976-04-03 | 1983-06-23 | Total Feuerschutz GmbH, 6802 Ladenburg | Circuit arrangement for evaluating a random pulse sequence from a radiation-sensitive gas discharge detector |
| JPS52153759A (en) * | 1976-06-17 | 1977-12-21 | Hochiki Co | Storage type detector |
| US4162425A (en) * | 1977-06-30 | 1979-07-24 | Detector Electronics Corporation | Ultraviolet detection tube quenching circuitry |
| JPH0648293B2 (en) * | 1983-03-18 | 1994-06-22 | 和芙 橋本 | Automatic measurement and alarm device for radioactivity |
| US4521120A (en) * | 1983-09-15 | 1985-06-04 | The United States Of America As Represented By The Secretary Of Agriculture | Forest fire rate of spread with timers method |
| GB2199656B (en) * | 1987-01-07 | 1990-10-17 | Graviner Ltd | Detection of electromagnetic radiation |
| DE3706986A1 (en) * | 1987-03-04 | 1988-09-15 | Preussag Ag Feuerschutz | Method for evaluating the UV component in the flame spectrum by means of an electronic flame detector |
| US6600425B1 (en) * | 2002-03-19 | 2003-07-29 | Elite Access Systems, Inc. | Method and apparatus for detecting and recording episodic overloads in a circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3175165A (en) * | 1962-06-29 | 1965-03-23 | Edward S Dayhoff | Light controlled variable frequency pulse generator |
| US3393319A (en) * | 1965-09-30 | 1968-07-16 | Bausch & Lomb | Photoelectric circuit for counting light pulses above a minimium value |
-
1968
- 1968-02-15 FR FR139945A patent/FR1565498A/fr not_active Expired
-
1969
- 1969-01-30 BE BE727699D patent/BE727699A/xx not_active IP Right Cessation
- 1969-01-31 CH CH152969A patent/CH486746A/en not_active IP Right Cessation
- 1969-02-05 GB GB6224/69A patent/GB1255221A/en not_active Expired
- 1969-02-07 US US797402A patent/US3621262A/en not_active Expired - Lifetime
- 1969-02-07 DE DE1906075A patent/DE1906075C3/en not_active Expired
- 1969-02-07 NL NL6901997.A patent/NL164981C/en not_active IP Right Cessation
- 1969-02-10 AT AT134469A patent/AT293920B/en not_active IP Right Cessation
- 1969-02-11 SE SE1851/69A patent/SE344254B/xx unknown
- 1969-02-14 ES ES363669A patent/ES363669A1/en not_active Expired
- 1969-02-14 CA CA042914A patent/CA929251A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1906075B2 (en) | 1973-07-26 |
| DE1906075C3 (en) | 1974-02-21 |
| NL164981B (en) | 1980-09-15 |
| SE344254B (en) | 1972-04-04 |
| CH486746A (en) | 1970-02-28 |
| AT293920B (en) | 1971-10-25 |
| US3621262A (en) | 1971-11-16 |
| DE1906075A1 (en) | 1969-09-04 |
| FR1565498A (en) | 1969-05-02 |
| CA929251A (en) | 1973-06-26 |
| NL164981C (en) | 1981-02-16 |
| ES363669A1 (en) | 1971-01-01 |
| BE727699A (en) | 1969-07-01 |
| NL6901997A (en) | 1969-08-19 |
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