GB2010578A - Smoke detectors - Google Patents

Smoke detectors

Info

Publication number
GB2010578A
GB2010578A GB7843521A GB7843521A GB2010578A GB 2010578 A GB2010578 A GB 2010578A GB 7843521 A GB7843521 A GB 7843521A GB 7843521 A GB7843521 A GB 7843521A GB 2010578 A GB2010578 A GB 2010578A
Authority
GB
United Kingdom
Prior art keywords
auxiliary electrode
electrodes
electrode
smoke
ionisation 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.)
Granted
Application number
GB7843521A
Other versions
GB2010578B (en
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.)
GE Healthcare Ltd
Original Assignee
Radiochemical Centre 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 Radiochemical Centre Ltd filed Critical Radiochemical Centre Ltd
Priority to GB7843521A priority Critical patent/GB2010578B/en
Publication of GB2010578A publication Critical patent/GB2010578A/en
Application granted granted Critical
Publication of GB2010578B publication Critical patent/GB2010578B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/14—Checking intermittently signalling or alarm systems checking the detection circuits
    • G08B29/145—Checking intermittently signalling or alarm systems checking the detection circuits of fire detection circuits
    • 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
    • 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

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

In an ionization smoke detector having first and second electrodes defining an ionisation chamber permitting entry of smoke, a radioactive source 20 to ionise gas in the ionisation chamber and a potential difference applied across the first and second electrodes to cause an ion current to flow, which current is affected by entry of smoke, an auxiliary electrode 40 is positioned in the ionisation chamber between the first and second electrodes, and it is arranged to maintain or create a potential difference between the first electrode and the auxiliary electrode. The auxiliary electrode may be used for testing or for adjustment of sensitivity. As shown, a collector electrode 14 divides the chamber into two regions, with the auxiliary electrode in the outer sensing region. <IMAGE>
GB7843521A 1977-11-18 1978-11-07 Smoke detectors Expired GB2010578B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7843521A GB2010578B (en) 1977-11-18 1978-11-07 Smoke detectors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4815577 1977-11-18
GB7843521A GB2010578B (en) 1977-11-18 1978-11-07 Smoke detectors

Publications (2)

Publication Number Publication Date
GB2010578A true GB2010578A (en) 1979-06-27
GB2010578B GB2010578B (en) 1982-09-15

Family

ID=26266220

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7843521A Expired GB2010578B (en) 1977-11-18 1978-11-07 Smoke detectors

Country Status (1)

Country Link
GB (1) GB2010578B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111012A1 (en) * 1982-06-07 1984-06-20 Nohmi Bosai Kogyo Co., Ltd. Ionization type of smoke sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0111012A1 (en) * 1982-06-07 1984-06-20 Nohmi Bosai Kogyo Co., Ltd. Ionization type of smoke sensor
EP0111012A4 (en) * 1982-06-07 1984-12-11 Nohmi Bosai Kogyo Co Ltd Ionization type of smoke sensor.

Also Published As

Publication number Publication date
GB2010578B (en) 1982-09-15

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee