GB636341A - Improvements relating to electrically actuated detection or warning systems - Google Patents
Improvements relating to electrically actuated detection or warning systemsInfo
- Publication number
- GB636341A GB636341A GB933347A GB933347A GB636341A GB 636341 A GB636341 A GB 636341A GB 933347 A GB933347 A GB 933347A GB 933347 A GB933347 A GB 933347A GB 636341 A GB636341 A GB 636341A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- relay
- photo
- cathode
- detection
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
636,341. Valve relay circuits. TRIST & CO., Ltd., R., and CHAMBERS, W. A. April 8, 1947, No. 9333. [Class 40 (vi)] [Also in Group XL (b)] In a detection or warning system, a change in the voltage across a photo-electric cell is used to bias the control electrode negatively with respect to the cathode of a cold cathode valve and so to initiate the discharge through the valve. In a smoke detection and warning system, two photo-electric cells 4, 5, normally illuminated with the same intensity, are connected in series across a battery 11. The cold cathode of a valve 14 is connected to the mid-point of the battery and the control electrode of the valve is connected to the junction of the cells 4 and 5. The light beam falling on photo-electric cell 5 is protected from smoke which reduces the amount of light falling on the cell 4, and causes a small negative potential relative to the cathode to be applied to the control grid of valve 14, initiating a discharge through the valve and energizing a relay winding 18. Relay contact 26 connects a visible warning signal 22 and an audible alarm 21 to a potential source 27. Relay contacts 19, 20 break the anode circuit of the valve, and connect the relay winding across the supply 27 so that the alarm signals continue till pushbutton 23 is pressed to reset the circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB933347A GB636341A (en) | 1947-04-08 | 1947-04-08 | Improvements relating to electrically actuated detection or warning systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB933347A GB636341A (en) | 1947-04-08 | 1947-04-08 | Improvements relating to electrically actuated detection or warning systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB636341A true GB636341A (en) | 1950-04-26 |
Family
ID=9869930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB933347A Expired GB636341A (en) | 1947-04-08 | 1947-04-08 | Improvements relating to electrically actuated detection or warning systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB636341A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0290412A2 (en) * | 1987-05-06 | 1988-11-09 | Diantek Ab | A measuring head for detection of particles |
EP2302365A3 (en) * | 2009-09-22 | 2011-06-29 | Kidde Technologies Inc. | Sensor head for a dry powder agent |
-
1947
- 1947-04-08 GB GB933347A patent/GB636341A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0290412A2 (en) * | 1987-05-06 | 1988-11-09 | Diantek Ab | A measuring head for detection of particles |
EP0290412A3 (en) * | 1987-05-06 | 1989-05-10 | Diantek Ab | A measuring head for detection of particles |
US8077317B2 (en) | 2009-04-09 | 2011-12-13 | Kidde Technologies, Inc. | Sensor head for a dry powder agent |
EP2302365A3 (en) * | 2009-09-22 | 2011-06-29 | Kidde Technologies Inc. | Sensor head for a dry powder agent |
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