GB341086A - Improvements relating to the detection of foreign matter in fluids - Google Patents
Improvements relating to the detection of foreign matter in fluidsInfo
- Publication number
- GB341086A GB341086A GB30761/29A GB3076129A GB341086A GB 341086 A GB341086 A GB 341086A GB 30761/29 A GB30761/29 A GB 30761/29A GB 3076129 A GB3076129 A GB 3076129A GB 341086 A GB341086 A GB 341086A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- cell
- light
- alarm
- foreign matter
- 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
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
-
- 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
Abstract
341,086. Turbidometers. KIDDE & CO., Inc., W., 140, Cedar Street, New York, U.S.A.-(Assignees of Freygang, G. G. ; Weehawken, New Jersey, U.S.A.). Oct. 10, 1929, No. 30761. Convention date, Oct. 30, 1928. [Class 97 (iii).] In the system for the detection of foreign matter in fluids, for example, smoke in air, in which light is reflected and/or refracted on to a light-sensitive cell by the foreign matter when present in a stream of the fluid, the cell is permanently exposed to a small beam of light, so that a small supervisory current flows in the alarm circuit, which includes a no-load relay. As shown, smoke present in a stream of air passing across a light beam c<1> will illuminate the photo-electric cell e to cause an alarm to be given. A mirror g is associated with the light source c so that a small beam c<5> permanently illuminates the cell e. In a modification, a separate light source directs the beam upon the cell. The cell is in circuit with a battery i, no-load relay l, overload relay l<1>, and thermionic amplifier j. The constant light beam c<5> causes a supervisory current to flow in the circuit insufficient to operate the relay l<1> and sufficient to prevent operation of the relay l. Smoke in the light beam c<1> increases the current, operating the relay l<1> and an alarm m<1>. Failure of the apparatus from any cause interrupts the supervisory current, causing operation of the no-load relay l and an alarm m.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US341086XA | 1928-10-30 | 1928-10-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB341086A true GB341086A (en) | 1931-01-12 |
Family
ID=21874353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30761/29A Expired GB341086A (en) | 1928-10-30 | 1929-10-10 | Improvements relating to the detection of foreign matter in fluids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB341086A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0055319A1 (en) * | 1980-12-30 | 1982-07-07 | COMPAGNIE CENTRALE SICLI (Société Anonyme) | Smoke detector of the light diffusion type with self-checking |
| GB2163551A (en) * | 1984-07-31 | 1986-02-26 | Nittan Co Ltd | Light-scattering type smoke detector |
-
1929
- 1929-10-10 GB GB30761/29A patent/GB341086A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0055319A1 (en) * | 1980-12-30 | 1982-07-07 | COMPAGNIE CENTRALE SICLI (Société Anonyme) | Smoke detector of the light diffusion type with self-checking |
| GB2163551A (en) * | 1984-07-31 | 1986-02-26 | Nittan Co Ltd | Light-scattering type smoke detector |
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