GB1232841A - - Google Patents

Info

Publication number
GB1232841A
GB1232841A GB2215368A GB1232841DA GB1232841A GB 1232841 A GB1232841 A GB 1232841A GB 2215368 A GB2215368 A GB 2215368A GB 1232841D A GB1232841D A GB 1232841DA GB 1232841 A GB1232841 A GB 1232841A
Authority
GB
United Kingdom
Prior art keywords
smoke
air
tube
operates
pipes
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
GB2215368A
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 filed Critical
Publication of GB1232841A publication Critical patent/GB1232841A/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
    • 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

1,232,841. Smoke detectors. RADIOVISOR PARENT Ltd. and C. F. DIETRICHSEN. May 8, 1969 [May 9, 1968], No.22153/68. Heading G1A. [Also in Division G4] A smoke detection system includes a tube 3 having a plurality of T-junction pieces 4 at spaced intervals with substantially equal length pipes 5 of smaller bore than the tube attached at each junction piece, an air pump 2 draws air through said pipes and tube into a detector device 6 which provides an indication when smoke is present in the air-flow. When smoke is present light emenating from lamp 9 is scattered and falls on photocell 11 to give an output voltage which is amplified at 12 and operates a visual or audible alarm 13 or alternatively operates a control mechanism to reduce the fire hazard. Pump 2 of the diaphragm type driven by motor 2 and a flowmeter, preferably of the floating bobbin type, is provided so that a warning indication is obtained if the air-flow falls below a minimum value.
GB2215368A 1968-05-09 1968-05-09 Expired GB1232841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2215368 1968-05-09

Publications (1)

Publication Number Publication Date
GB1232841A true GB1232841A (en) 1971-05-19

Family

ID=10174785

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2215368A Expired GB1232841A (en) 1968-05-09 1968-05-09

Country Status (1)

Country Link
GB (1) GB1232841A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518287A1 (en) * 1981-12-10 1983-06-17 Cerberus Guinard Electrical conductor free smoke detector pipe networks - includes air flow sensor to indicate blockage of any air sampling holes in network using wheatstone bridge and heating resistors
EP0197371A1 (en) * 1985-03-20 1986-10-15 Siemens Aktiengesellschaft Fire detector arrangement with a suction system
EP0424881A2 (en) * 1989-10-23 1991-05-02 Preussag AG Feuerschutz Utilization of an air transfer system for fire control and air transfer system adapted for the purpose
GB2243475A (en) * 1990-04-26 1991-10-30 David Theodore Nels Williamson Gas and smoke alarm systems
EP0641430A1 (en) * 1992-05-14 1995-03-08 IEI PTY Ltd. Gas sampling point for smoke/pollution detection systems

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518287A1 (en) * 1981-12-10 1983-06-17 Cerberus Guinard Electrical conductor free smoke detector pipe networks - includes air flow sensor to indicate blockage of any air sampling holes in network using wheatstone bridge and heating resistors
EP0197371A1 (en) * 1985-03-20 1986-10-15 Siemens Aktiengesellschaft Fire detector arrangement with a suction system
EP0424881A2 (en) * 1989-10-23 1991-05-02 Preussag AG Feuerschutz Utilization of an air transfer system for fire control and air transfer system adapted for the purpose
EP0424881A3 (en) * 1989-10-23 1991-11-27 Preussag Ag Feuerschutz Utilization of an air transfer system for fire control and air transfer system adapted for the purpose
GB2243475A (en) * 1990-04-26 1991-10-30 David Theodore Nels Williamson Gas and smoke alarm systems
GB2243475B (en) * 1990-04-26 1993-12-01 David Theodore Nels Williamson Improvements to gas and smoke alarm systems
EP0641430A1 (en) * 1992-05-14 1995-03-08 IEI PTY Ltd. Gas sampling point for smoke/pollution detection systems
EP0641430A4 (en) * 1992-05-14 1995-09-13 Iei Pty Ltd Gas sampling point for smoke/pollution detection systems.

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees