SE328226B - - Google Patents
Info
- Publication number
- SE328226B SE328226B SE02364/67A SE236467A SE328226B SE 328226 B SE328226 B SE 328226B SE 02364/67 A SE02364/67 A SE 02364/67A SE 236467 A SE236467 A SE 236467A SE 328226 B SE328226 B SE 328226B
- Authority
- SE
- Sweden
- Prior art keywords
- chamber
- voltage
- thyristor
- feb
- ionization
- Prior art date
Links
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)
Abstract
1,109,587. Automatic fire alarms. CERBERUS A.G. 22 Feb., 1967 [22 Feb., 1966], No. 8469/67. Heading G4N. [Also in Division G1] In an ionization smoke detector, the chamber 10, Fig. 7, is connected in series with a resistor (11), Fig. 6 (not shown), or a reference ionization chamber 16, across a 60-volt supply, the voltage across the chamber being less than 20 volts. In the presence of smoke the voltage across the chamber increases, a field-effect transistor 12 is caused to conduct if its threshold voltage is exceeded, triggering a thyristor 14 which in turn energizes a relay 15 operating a fire alarm. A bias voltage Us may be applied to the thyristor 14 to control the alarm threshold.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH254966A CH446131A (en) | 1966-02-22 | 1966-02-22 | Ionization fire alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE328226B true SE328226B (en) | 1970-09-07 |
Family
ID=4236285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE02364/67A SE328226B (en) | 1966-02-22 | 1967-02-21 |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3521263A (en) |
| AT (1) | AT268101B (en) |
| BE (1) | BE694152A (en) |
| CH (1) | CH446131A (en) |
| DE (1) | DE1259227B (en) |
| DK (1) | DK126607C (en) |
| FR (1) | FR1511451A (en) |
| GB (1) | GB1109587A (en) |
| NL (1) | NL162493C (en) |
| SE (1) | SE328226B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO129270B (en) * | 1970-05-16 | 1974-03-18 | Preussag Ag Feuerschutz | |
| US3775616A (en) * | 1970-06-08 | 1973-11-27 | Nittan Co Ltd | Ionization smoke detector |
| US3735138A (en) * | 1971-10-27 | 1973-05-22 | Honeywell Inc | Ionization smoke detector |
| US3913082A (en) * | 1973-02-02 | 1975-10-14 | Jenson Robert S | Ionization aerosol detector |
| US4038649A (en) * | 1975-09-16 | 1977-07-26 | Emhart Industries, Inc. | Smoke detection alarm device |
| US4053776A (en) * | 1976-05-25 | 1977-10-11 | The United States Of America As Represented By Thesecretary Of The Interior | Sub-micron particle detector |
| US4286160A (en) * | 1977-01-27 | 1981-08-25 | Ried Jr Louis | Ionization particle detector |
| CA1148279A (en) * | 1979-12-14 | 1983-06-14 | Andreas Scheidweiler | Ionization smoke detector with increased operational reliability |
| US4488044A (en) * | 1981-11-20 | 1984-12-11 | Pittway Corporation | Ionization chamber for smoke detector and the like |
| US4755682A (en) * | 1986-10-07 | 1988-07-05 | The United States Of America As Represented By The United States Department Of Energy | Ionization monitor with improved ultra-high megohm resistor |
| US4808977A (en) * | 1987-08-20 | 1989-02-28 | Hedrick Terry J | Electromechanical evacuation exit indicating flag |
| US5189399A (en) * | 1989-02-18 | 1993-02-23 | Hartwig Beyersdorf | Method of operating an ionization smoke alarm and ionization smoke alarm |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2145866A (en) * | 1929-08-14 | 1939-02-07 | Gioacchino Failla | Electrotechnique |
| BE393134A (en) * | 1932-11-07 | |||
| DE1287825B (en) * | 1962-01-10 | |||
| GB1009271A (en) * | 1963-03-04 | 1965-11-10 | Associated Fire Alarms Ltd | Improvements in or relating to smoke detector circuits |
-
1966
- 1966-02-22 CH CH254966A patent/CH446131A/en unknown
-
1967
- 1967-01-25 DE DEC41323A patent/DE1259227B/en active Pending
- 1967-01-27 AT AT78267A patent/AT268101B/en active
- 1967-02-02 DK DK59467A patent/DK126607C/en not_active IP Right Cessation
- 1967-02-05 NL NL6701753.A patent/NL162493C/en not_active IP Right Cessation
- 1967-02-15 FR FR95041A patent/FR1511451A/en not_active Expired
- 1967-02-16 BE BE694152D patent/BE694152A/xx not_active IP Right Cessation
- 1967-02-20 US US617226A patent/US3521263A/en not_active Expired - Lifetime
- 1967-02-21 SE SE02364/67A patent/SE328226B/xx unknown
- 1967-02-22 GB GB8469/67A patent/GB1109587A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1109587A (en) | 1968-04-10 |
| DE1259227B (en) | 1968-01-18 |
| DK126607B (en) | 1973-07-30 |
| BE694152A (en) | 1967-07-31 |
| AT268101B (en) | 1969-01-27 |
| US3521263A (en) | 1970-07-21 |
| NL162493B (en) | 1979-12-17 |
| NL6701753A (en) | 1967-08-23 |
| CH446131A (en) | 1967-10-31 |
| FR1511451A (en) | 1968-01-26 |
| DK126607C (en) | 1977-06-20 |
| NL162493C (en) | 1980-05-16 |
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