SE8701873D0 - METHOD HEAD OF ROCK DETECTOR - Google Patents
METHOD HEAD OF ROCK DETECTORInfo
- Publication number
- SE8701873D0 SE8701873D0 SE8701873A SE8701873A SE8701873D0 SE 8701873 D0 SE8701873 D0 SE 8701873D0 SE 8701873 A SE8701873 A SE 8701873A SE 8701873 A SE8701873 A SE 8701873A SE 8701873 D0 SE8701873 D0 SE 8701873D0
- Authority
- SE
- Sweden
- Prior art keywords
- holes
- holder
- measuring path
- ventilation duct
- row
- 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
- G08B17/103—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
-
- 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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A measuring head, e.g. for a smoke detector, includes a tubular holder (1) intended for being disposed in a ventilation duct for being passed through by the air which is to be monitored. The portion of the holder to be introduced in the ventilation duct is ended by an optical reflector (6) defining one end of a measuring path while the opposite defining surface of the measuring path includes a beam transmitting means and a detector means. The peripheral surface of the holder around the measuring path has a number, preferably six, of rows of holes (2) with at least six holes in each row. The holes in a row are staggered relative the holes in adjacent rows, the staggering amounting to between 1/4 and 1/3 of the hole width. At least 1/4 of the peripheral surface of the holder introduced in the ventilation duct and surrounding the measuring path is covered by the holes.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8701873A SE8701873L (en) | 1987-05-06 | 1987-05-06 | MEASURING HEAD FOR SMOKE DETECTOR |
EP88850155A EP0290412A3 (en) | 1987-05-06 | 1988-05-06 | A measuring head for detection of particles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8701873A SE8701873L (en) | 1987-05-06 | 1987-05-06 | MEASURING HEAD FOR SMOKE DETECTOR |
Publications (2)
Publication Number | Publication Date |
---|---|
SE8701873D0 true SE8701873D0 (en) | 1987-05-06 |
SE8701873L SE8701873L (en) | 1988-11-07 |
Family
ID=20368437
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8701873A SE8701873L (en) | 1987-05-06 | 1987-05-06 | MEASURING HEAD FOR SMOKE DETECTOR |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0290412A3 (en) |
SE (1) | SE8701873L (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5103212A (en) * | 1989-07-03 | 1992-04-07 | Worcester Polytechnic Institute | Balanced fluid flow delivery system |
US8077317B2 (en) | 2009-04-09 | 2011-12-13 | Kidde Technologies, Inc. | Sensor head for a dry powder agent |
US9207172B2 (en) | 2011-05-26 | 2015-12-08 | Kidde Technologies, Inc. | Velocity survey with powderizer and agent flow indicator |
US11493229B2 (en) | 2019-03-20 | 2022-11-08 | Carrier Corporation | Chamberless wide area duct smoke detector |
US11850458B2 (en) | 2021-04-19 | 2023-12-26 | Kidde Technologies, Inc. | Flow control device for particle concentration measurement sensor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE699466C (en) * | 1937-06-29 | 1940-11-29 | Minimax Akt Ges | Smoke alarm device |
GB636341A (en) * | 1947-04-08 | 1950-04-26 | Trist & Co Ltd Ronald | Improvements relating to electrically actuated detection or warning systems |
CH567262A5 (en) * | 1974-05-20 | 1975-09-30 | Cerberus Ag | Extinction detector with electromagnetic radiation source - has radiation penetrating medium under analysis |
US4294124A (en) * | 1980-04-10 | 1981-10-13 | Air Products And Chemicals, Inc. | Apparatus for extraction of materials from operating pressurized vessels |
-
1987
- 1987-05-06 SE SE8701873A patent/SE8701873L/en not_active Application Discontinuation
-
1988
- 1988-05-06 EP EP88850155A patent/EP0290412A3/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
SE8701873L (en) | 1988-11-07 |
EP0290412A2 (en) | 1988-11-09 |
EP0290412A3 (en) | 1989-05-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAV | Patent application has lapsed |
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