GB1308242A - Ionization smoke detecting system - Google Patents
Ionization smoke detecting systemInfo
- Publication number
- GB1308242A GB1308242A GB2639970A GB2639970A GB1308242A GB 1308242 A GB1308242 A GB 1308242A GB 2639970 A GB2639970 A GB 2639970A GB 2639970 A GB2639970 A GB 2639970A GB 1308242 A GB1308242 A GB 1308242A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thyristor
- potential
- generator
- chambers
- smoke
- 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
- 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
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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1308242 Testing ionization smoke detectors NITTAN CO Ltd 1 June 1970 [2 June 1969, 11 Sept 1969 4 Oct 1969(2)] 26399/70 Headings G1N and G1U [Also in Division H3] The invention is concerned with testing smoke detectors Fig. 1 of the kind comprising open and closed ionization chambers 10, 20 connected in series across a voltage supply 4, 5 such that when smoke enters the open chamber 20 the potential 1 between the two chambers rises to increase conduction through an f. e.t. 3, causing a zener diode 8 to break down and fire a thyristor 7. Such smoke detectors are modified by the provision of a switch 15 to isolate the electrode 21 of chamber 20, and are tested by applying an increasing potential to electrode 21 and detecting when the thyristor 7 fires as a result of the consequent increase in the potential 1 between the chambers. The testing apparatus Fig. 3 comprises a generator 26 of the increasing voltage and a relay 28 in series with a supply 25 for the smoke detector. When the thyristor 7 fires one contact 42 of relay 28 closes to light a lamp 56 whilst another contact 41 opens to prevent further increase in the output of generator 26, the generator output being measured on a meter 29.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4252669 | 1969-06-02 | ||
| JP7158669 | 1969-09-11 | ||
| JP7897469 | 1969-10-04 | ||
| JP7897569 | 1969-10-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1308242A true GB1308242A (en) | 1973-02-21 |
Family
ID=27461210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2639970A Expired GB1308242A (en) | 1969-06-02 | 1970-06-01 | Ionization smoke detecting system |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3657713A (en) |
| GB (1) | GB1308242A (en) |
| NL (1) | NL147269B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3702468A (en) * | 1970-08-10 | 1972-11-07 | Nittan Co Ltd | Fire alarming system |
| CA1148279A (en) * | 1979-12-14 | 1983-06-14 | Andreas Scheidweiler | Ionization smoke detector with increased operational reliability |
| JPS6017157B2 (en) * | 1981-02-25 | 1985-05-01 | ニツタン株式会社 | Selective actuatable fire detector |
| US4481502A (en) * | 1982-03-26 | 1984-11-06 | Dawson N Rick | Central smoke alarm and annunciator |
| US4538137A (en) * | 1983-01-20 | 1985-08-27 | Nittan Company, Limited | Fire detector |
| US4595914A (en) * | 1983-04-11 | 1986-06-17 | Pittway Corporation | Self-testing combustion products detector |
| US5546074A (en) * | 1993-08-19 | 1996-08-13 | Sentrol, Inc. | Smoke detector system with self-diagnostic capabilities and replaceable smoke intake canopy |
| US6501810B1 (en) | 1998-10-13 | 2002-12-31 | Agere Systems Inc. | Fast frame synchronization |
| US7489136B1 (en) * | 2005-08-04 | 2009-02-10 | Nu-Trek, Inc. | Apparatus and method of detecting radiation |
| JP4446290B2 (en) * | 2006-03-02 | 2010-04-07 | 日立工機株式会社 | Electric tools and tabletop cutting machines |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH380594A (en) * | 1960-11-02 | 1964-07-31 | Securiton Ag | Ionization fire alarm system |
| JPS446089Y1 (en) * | 1966-03-30 | 1969-03-05 |
-
1970
- 1970-05-21 US US39329A patent/US3657713A/en not_active Expired - Lifetime
- 1970-06-01 GB GB2639970A patent/GB1308242A/en not_active Expired
- 1970-06-02 NL NL707007956A patent/NL147269B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE2027064B2 (en) | 1972-06-22 |
| DE2027064A1 (en) | 1971-01-21 |
| NL7007956A (en) | 1970-12-04 |
| US3657713A (en) | 1972-04-18 |
| NL147269B (en) | 1975-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |