GB1308933A - Fire detection apparatus - Google Patents
Fire detection apparatusInfo
- Publication number
- GB1308933A GB1308933A GB1308933DA GB1308933A GB 1308933 A GB1308933 A GB 1308933A GB 1308933D A GB1308933D A GB 1308933DA GB 1308933 A GB1308933 A GB 1308933A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- aug
- amplifier
- integrator
- trigger
- 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 1
- 230000003321 amplification Effects 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000010892 electric spark Methods 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 abstract 1
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000010784 textile waste 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
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
1308933 Photo-electric spark detector TALENTUM DEVELOPMENTS Ltd 20 Aug 1971 [22 Aug 1970] 40550/70 Heading G1A A flame or spark detector comprises an infrared photo-conductive cell such as of lead sulphide a first amplifier F.E.T. 3, an electrical filter f 1-4 , g 1-4 to eliminate any D.C. component, and frequencies above 50 Hz, a second amplifier 7, 8 with maximum amplification up to 10 Hz and a substantial cut-off at 20 Hz, voltage dipper h, a diode-pump integrator 12, and a bi-stable trigger 13 for operating warning or fire control means, the dipping means integrating means and trigger being arranged such that the triggering voltage is not reached if the frequency of the signal input to the integrator is less that 3 Hz. Circuit parameters are examplified and mains smoothing and stabilizing arrangements are described. A tube including printed circuitry in which the cell is mounted in a bore is described and its application to monitoring air removed textile waste is referred to. The circuit may include means to flash a lamp 20 in proximity to the cell for test purposes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4055070 | 1970-08-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1308933A true GB1308933A (en) | 1973-03-07 |
Family
ID=10415467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1308933D Expired GB1308933A (en) | 1970-08-22 | 1970-08-22 | Fire detection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1308933A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2179519A (en) * | 1977-09-16 | 1987-03-04 | Zeiss Stiftung | Detecting helicopters |
-
1970
- 1970-08-22 GB GB1308933D patent/GB1308933A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2179519A (en) * | 1977-09-16 | 1987-03-04 | Zeiss Stiftung | Detecting helicopters |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PE20 | Patent expired after termination of 20 years |