GB1485790A - Fire sensor devices - Google Patents
Fire sensor devicesInfo
- Publication number
- GB1485790A GB1485790A GB4850574A GB4850574A GB1485790A GB 1485790 A GB1485790 A GB 1485790A GB 4850574 A GB4850574 A GB 4850574A GB 4850574 A GB4850574 A GB 4850574A GB 1485790 A GB1485790 A GB 1485790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sensors
- signals
- zener diode
- transistor
- combined
- 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
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
1485790 Ionization and semi-conductor smoke detectors NOHMI BOSAI KOGYO CO Ltd 8 Nov 1974 [9 Nov 1973 29 May 1974] 48505/74 Heading G1N [Also in Division G4] A fire alarm comprises two sensors, differently responsive to at least one phenomenon accompanying combustion and giving a progressive change in output signal in response to said phenomenon and a common evaluating circuit arranged so that an alarm signal is only given when the sum of changes in the output signals of the two sensors exceeds a predetermined level. In Fig. 3 one sensor is a semi-conductor CO sensitive device 90 having a heater 93 and a further electrode 92. The further sensor takes the form of a photo-electric smoke detector 12, 13. After amplification at 95, 72, 11, 76 the signals from the two sensors are combined at the collectors of transistors 72, 76 so that each tends to reduce the sensitivity of Zener diode 80. In the combined presence of adequate signals from both sensors, Zener diode 80 breaks down, so that transistor 81 turns on thyristor 7 and energizes the alarm relay 41. In Fig. 1 (not shown) a pair of ionization chambers are coupled to a FET connected in series with a junction transistor supplied with signals from a photo-electric detector. The combined outputs from the FET and junction transistor break down a Zener diode which turns on a transistor which triggers thyristor 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1973130045U JPS5725351Y2 (en) | 1973-11-09 | 1973-11-09 | |
| JP1974061692U JPS5756304Y2 (en) | 1974-05-29 | 1974-05-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1485790A true GB1485790A (en) | 1977-09-14 |
Family
ID=26402756
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB498977A Expired GB1486535A (en) | 1973-11-09 | 1974-11-08 | Fire sensor devices |
| GB4850574A Expired GB1485790A (en) | 1973-11-09 | 1974-11-08 | Fire sensor devices |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB498977A Expired GB1486535A (en) | 1973-11-09 | 1974-11-08 | Fire sensor devices |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH572252A5 (en) |
| DE (1) | DE2452839B2 (en) |
| FR (1) | FR2251060A1 (en) |
| GB (2) | GB1486535A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4975684A (en) * | 1988-06-10 | 1990-12-04 | Cerberus Ag | Fire detecting system |
| US5005003A (en) * | 1988-03-30 | 1991-04-02 | Cerberus Ag | Method of detecting fire in an early stage |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH586941A5 (en) * | 1975-07-25 | 1977-04-15 | Cerberus Ag | |
| DE2702933C2 (en) * | 1977-01-25 | 1985-08-29 | Preussag Ag Feuerschutz, 2060 Bad Oldesloe | Fire alarm |
| JPS583272B2 (en) * | 1978-06-07 | 1983-01-20 | ホーチキ株式会社 | fire detector |
| US4225860A (en) * | 1979-01-15 | 1980-09-30 | Pittway Corporation | Sensitivity controlled dual input fire detector |
| US4401978A (en) * | 1979-02-21 | 1983-08-30 | The Gamewell Corporation | Combination detector |
| US4316184A (en) * | 1979-07-27 | 1982-02-16 | Pittway Corporation | Combination combustion-products detector |
| EP0039761A3 (en) * | 1980-05-09 | 1981-11-25 | Cerberus Ag | Fire annunciating arrangement and method |
| JPS5977594A (en) * | 1982-10-27 | 1984-05-04 | ニツタン株式会社 | Fire alarm system |
| DE3337330A1 (en) * | 1983-10-13 | 1985-04-25 | Siemens AG, 1000 Berlin und 8000 München | METHOD AND ARRANGEMENT FOR ANALOGUE TRANSFER OF MEASURED VALUES OF THE RESPECTIVE FIRE CHARACTERISTICS OF A MULTI-CRITERIA FIRE DETECTOR |
| US6229439B1 (en) * | 1998-07-22 | 2001-05-08 | Pittway Corporation | System and method of filtering |
| DE102014019172B4 (en) | 2014-12-17 | 2023-12-07 | Elmos Semiconductor Se | Device and method for distinguishing between solid objects, cooking fumes and smoke using a compensating optical measuring system |
| DE102014019773B4 (en) | 2014-12-17 | 2023-12-07 | Elmos Semiconductor Se | Device and method for distinguishing between solid objects, cooking fumes and smoke using the display of a mobile telephone |
-
1974
- 1974-11-04 CH CH1471374A patent/CH572252A5/xx not_active IP Right Cessation
- 1974-11-07 FR FR7436950A patent/FR2251060A1/fr not_active Withdrawn
- 1974-11-07 DE DE19742452839 patent/DE2452839B2/en not_active Withdrawn
- 1974-11-08 GB GB498977A patent/GB1486535A/en not_active Expired
- 1974-11-08 GB GB4850574A patent/GB1485790A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5005003A (en) * | 1988-03-30 | 1991-04-02 | Cerberus Ag | Method of detecting fire in an early stage |
| US4975684A (en) * | 1988-06-10 | 1990-12-04 | Cerberus Ag | Fire detecting system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2452839B2 (en) | 1978-08-24 |
| CH572252A5 (en) | 1976-01-30 |
| FR2251060A1 (en) | 1975-06-06 |
| GB1486535A (en) | 1977-09-21 |
| DE2452839A1 (en) | 1975-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1485790A (en) | Fire sensor devices | |
| GB1432787A (en) | Method for sensing the presence of fire and apparatus employing said method | |
| SE7709081L (en) | DETECTOR FOR AUTOMATIC DETECTION OF AIR IN A KNOWLEDGE | |
| GB1117058A (en) | Improvements in or relating to electronic flash apparatus for use in photography and to light responsive control circuits for use in such apparatus | |
| SE7712385L (en) | FIREPLACE FACILITY | |
| SE7707296L (en) | BURGLARY PROTECTION | |
| US4222046A (en) | Abnormal condition responsive means with periodic high sensitivity | |
| US4041479A (en) | Output circuit of an ionization smoke sensor | |
| GB1109587A (en) | Improvements in or relating to ionization smoke detectors | |
| US3559196A (en) | Fire alarm with bistable characteristics | |
| GB1298083A (en) | Alarm circuit | |
| US3813565A (en) | Detector apparatus | |
| KR840000005A (en) | Dual spectrum fire detector with identification function | |
| GB1429781A (en) | Multi-point alarm systems | |
| US3666954A (en) | Ionization smoke detector and leakage sensing means therefor | |
| GB1478952A (en) | Fire alarm devices and in installations including such devices | |
| GB1430091A (en) | Apparatus for detecting smoke and like suspensions | |
| GB1299326A (en) | Ionization smoke detectors | |
| ES450049A1 (en) | Ionization-type fire or smoke sensing system | |
| FR2274982A1 (en) | Circuit for fire alarm - uses ionisation chamber and alarm signal is provided when detector signal exceeds threshold level | |
| GB1172353A (en) | Improvements relating to Smoke Detectors | |
| GB1222351A (en) | Improvements in or relating to fire-detection apparatus | |
| GB1265893A (en) | ||
| GB1349304A (en) | Heat detector | |
| GB912046A (en) | A photo-sensitive detecting system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |