GB729140A - Improvements relating to smoke indicators - Google Patents

Improvements relating to smoke indicators

Info

Publication number
GB729140A
GB729140A GB8744/52A GB874452A GB729140A GB 729140 A GB729140 A GB 729140A GB 8744/52 A GB8744/52 A GB 8744/52A GB 874452 A GB874452 A GB 874452A GB 729140 A GB729140 A GB 729140A
Authority
GB
United Kingdom
Prior art keywords
smoke
diffused
photo
tubes
chamber
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
Application number
GB8744/52A
Inventor
Reginald William James Cockram
Neil Sullivan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pyrene Co Ltd
Original Assignee
Pyrene Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pyrene Co Ltd filed Critical Pyrene Co Ltd
Priority to GB8744/52A priority Critical patent/GB729140A/en
Publication of GB729140A publication Critical patent/GB729140A/en
Expired legal-status Critical Current

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

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

729,140. Turbidometers. PYRENE CO., Ltd. March 25, 1953 [April 4, 1952], No. 8744/52. Class 97 (3). [Also in Groups XXXVIII and XL (b)] In a device for detecting the presence of smoke by means of light diffused by the smoke either to the eye or to a photo-electric cell, the centre lines of the illuminating beam and the illuminated field intersect at an angle of less than 70 degrees. As shown, air is drawn from compartments under examination through tubes 12 and into chambers 2, around a central light source 6 and away through exhaust tube 10. The end of each of tubes 12 projects out of the inner wall of the chamber to a point near the light source, a portion of tube being cut away inside the chamber as shown. The light diffused from smoke-laden air in this space is diffused to an observer or a photo-electric cell 16 in the bottom of the apparatus.
GB8744/52A 1952-04-04 1952-04-04 Improvements relating to smoke indicators Expired GB729140A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8744/52A GB729140A (en) 1952-04-04 1952-04-04 Improvements relating to smoke indicators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8744/52A GB729140A (en) 1952-04-04 1952-04-04 Improvements relating to smoke indicators

Publications (1)

Publication Number Publication Date
GB729140A true GB729140A (en) 1955-05-04

Family

ID=9858434

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8744/52A Expired GB729140A (en) 1952-04-04 1952-04-04 Improvements relating to smoke indicators

Country Status (1)

Country Link
GB (1) GB729140A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231748A (en) * 1961-10-30 1966-01-25 Fyr Fyter Co Smoke detector
GB2000282A (en) * 1977-06-27 1979-01-04 Nittan Co Ltd Light scattering smoke detector
EP0142672A1 (en) * 1983-09-23 1985-05-29 Siemens Aktiengesellschaft Optical smoke detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231748A (en) * 1961-10-30 1966-01-25 Fyr Fyter Co Smoke detector
GB2000282A (en) * 1977-06-27 1979-01-04 Nittan Co Ltd Light scattering smoke detector
GB2000282B (en) * 1977-06-27 1982-01-20 Nittan Co Ltd Improvements in or relating to a light scattering smoke detector
EP0142672A1 (en) * 1983-09-23 1985-05-29 Siemens Aktiengesellschaft Optical smoke detector

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