GB1306394A - - Google Patents

Info

Publication number
GB1306394A
GB1306394A GB4912870A GB4912870A GB1306394A GB 1306394 A GB1306394 A GB 1306394A GB 4912870 A GB4912870 A GB 4912870A GB 4912870 A GB4912870 A GB 4912870A GB 1306394 A GB1306394 A GB 1306394A
Authority
GB
United Kingdom
Prior art keywords
detectors
switch
contact
ionisation
open
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
GB4912870A
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 GB1306394A publication Critical patent/GB1306394A/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
    • G08B17/11—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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Abstract

1306394 Fire detectors NITTAN CO Ltd 15 Oct 1970 [16 Oct 1969] 49128/70 Heading G1N Also in Division G4] In a fire detecting system, a plurality of ionisation smoke detectors 101-104, each including an open and a closed ionisation chamber 10, 20, a F.E.T.4 and a SCR 6, are connected in parallel across a voltage supply 18, included in a unit 40, when a switch 34 is connected to contact 31-2, the system being tested for faulty operation of any of the detectors by connecting switch 31 to contact 31-4 to apply a voltage across the open ionisation chambers to thereby operate each detector as if smoke had entered therein. After a time, the switch 31 is connected to contact 31-1 to connect a resistor 16 to one side of each SCR 6 and if any of the detectors are non-operative a voltage appears on voltmeter 19, the non-operative detector then being located by inspecting the lamps 5 of the detectors. A smaller test voltage may be applied to the open ionisation chambers by connecting switch 31 to contact 31-3, any of the detectors which does operate then being regarded as faulty. Under normal operation, if any of the detectors detects smoke, an alarm 17 is energized through relays 33,34, the system being reset by a switch 32.
GB4912870A 1969-10-16 1970-10-15 Expired GB1306394A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8224769 1969-10-16

Publications (1)

Publication Number Publication Date
GB1306394A true GB1306394A (en) 1973-02-07

Family

ID=13769085

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4912870A Expired GB1306394A (en) 1969-10-16 1970-10-15

Country Status (4)

Country Link
US (1) US3717862A (en)
FR (1) FR2065444A5 (en)
GB (1) GB1306394A (en)
SE (1) SE353808B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3193486A (en) * 1962-10-23 1965-07-06 Sinclair Research Inc Process for recovering catalyst particles in residual oils obtained in the conversion of hydrocarbon oils
US4004288A (en) * 1975-01-29 1977-01-18 Unitec, Inc. Battery operated fire detection unit
JPS51100085U (en) * 1975-02-10 1976-08-11
CH597659A5 (en) * 1976-02-06 1978-04-14 Cerberus Ag
JPS52111590U (en) * 1976-02-20 1977-08-24
US4093943A (en) * 1976-12-27 1978-06-06 Knight Webster B Sequential power distribution circuit
US4238788A (en) * 1978-01-03 1980-12-09 Teledyne Industries, Inc. System for detecting a combustion process
EP0039761A3 (en) * 1980-05-09 1981-11-25 Cerberus Ag Fire annunciating arrangement and method
JPS57172495A (en) * 1981-04-15 1982-10-23 Nittan Co Ltd Select test circuit for fire sensor, etc.
US4538137A (en) * 1983-01-20 1985-08-27 Nittan Company, Limited Fire detector
US4725818A (en) * 1985-09-13 1988-02-16 Simplex Time Recorder Co. Walk through test system
US4916432A (en) * 1987-10-21 1990-04-10 Pittway Corporation Smoke and fire detection system communication
CA3098999A1 (en) 2018-05-11 2019-11-14 Carrier Corporation System and method for testing networked alarm units

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS446089Y1 (en) * 1966-03-30 1969-03-05
CH473431A (en) * 1966-05-09 1969-05-31 Cerberus Ag Werk Fuer Elektron Procedure for monitoring the operation of fire alarms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176600A (en) * 1985-06-21 1986-12-31 Francis Edward Mckenna Fire hazard detection system

Also Published As

Publication number Publication date
DE2050719A1 (en) 1971-05-19
DE2050719B2 (en) 1973-01-25
SE353808B (en) 1973-02-12
US3717862A (en) 1973-02-20
FR2065444A5 (en) 1971-07-23
SE1401770A (en) 1971-04-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee