GB1062832A - An electric alarm apparatus incorporating ionisation chambers - Google Patents

An electric alarm apparatus incorporating ionisation chambers

Info

Publication number
GB1062832A
GB1062832A GB958065A GB958065A GB1062832A GB 1062832 A GB1062832 A GB 1062832A GB 958065 A GB958065 A GB 958065A GB 958065 A GB958065 A GB 958065A GB 1062832 A GB1062832 A GB 1062832A
Authority
GB
United Kingdom
Prior art keywords
apparatus incorporating
alarm apparatus
march
electric alarm
ionisation chambers
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
GB958065A
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.)
Danske Securitas AS
Original Assignee
Danske Securitas AS
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
Priority claimed from DK116964AA external-priority patent/DK110225C/en
Application filed by Danske Securitas AS filed Critical Danske Securitas AS
Publication of GB1062832A publication Critical patent/GB1062832A/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)

Abstract

1, 062, 832. Smoke detectors. DANSKE SECURITAS A/S. March 5, 1965 [March 7, 1964], No.9580/65. Addition to 1, 020, 771, Heading G1N. The smoke detector of the parent Specification, wherein a reference and test ionization chambers are connected in a bridge circuit to actuate a relay on unbalance, is modified by providing positive feedback from the output of the relayoperating-amplifier through a transformer to the bridge so that the amplifier becomes self oscillating to sustain the alarm circuit. Modifications. Fig. 2 (not shown):- (i) a contact (21) may be arranged to connect resistors (16, 23) across the potentiometer in event of a fault e. g. in the radioactive member; (ii) a thermal "fire detecting" fuse (24) may be provided; (iii) a test button (27) may be provided.
GB958065A 1964-03-07 1965-03-05 An electric alarm apparatus incorporating ionisation chambers Expired GB1062832A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK116964AA DK110225C (en) 1961-12-30 1964-03-07 Electrical alarm system, preferably for fire alarm.

Publications (1)

Publication Number Publication Date
GB1062832A true GB1062832A (en) 1967-03-22

Family

ID=8101775

Family Applications (1)

Application Number Title Priority Date Filing Date
GB958065A Expired GB1062832A (en) 1964-03-07 1965-03-05 An electric alarm apparatus incorporating ionisation chambers

Country Status (3)

Country Link
AT (1) AT260068B (en)
GB (1) GB1062832A (en)
SE (1) SE317012B (en)

Also Published As

Publication number Publication date
SE317012B (en) 1969-11-03
AT260068B (en) 1968-02-12

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