GB1298083A - Alarm circuit - Google Patents

Alarm circuit

Info

Publication number
GB1298083A
GB1298083A GB62602/69A GB6260269A GB1298083A GB 1298083 A GB1298083 A GB 1298083A GB 62602/69 A GB62602/69 A GB 62602/69A GB 6260269 A GB6260269 A GB 6260269A GB 1298083 A GB1298083 A GB 1298083A
Authority
GB
United Kingdom
Prior art keywords
amplifier
fmv
transmitter
line
source
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
GB62602/69A
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.)
Tokyo Hochiki Co Ltd
Original Assignee
Tokyo Hochiki 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 Tokyo Hochiki Co Ltd filed Critical Tokyo Hochiki Co Ltd
Publication of GB1298083A publication Critical patent/GB1298083A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00—Details of radiation-measuring instruments
    • G01T7/12—Provision for actuation of an alarm
    • G01T7/125—Alarm- or controlling circuits using ionisation chambers, proportional counters or Geiger-Mueller tubes, also functioning as UV detectors
    • 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

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)

Abstract

1298083 Smoke detectors TOKYO HOCHIKI K K 23 Dec 1969 [26 Dec 1968 3 May 1969 7 Nov 1969] 62602/69 Heading G1N [Also in Divisions G4 and H3] A transmitter P for an alarm system comprises an element OC, responsive to a change in a physical condition, an amplifier F1, A, means such as a multi-vibrator FMV for intermittently supplying power from a line l 1 , l 2 to said amplifier F1, A, to cause said amplifier to amplify the output of said element OC and means such as a thyristor SCR for allowing current to pass along said line l 1 , l 2 to operate alarm means L in a remote receiver, in response to change in output of said element OC. The multi-vibrator FMV preferably provides pulses of very small mark/space ratio so that the system is immense from most spurious signals. As described, a smoke detector comprises inner and outer ionization chambers IC, OC having a source of radiation material. The transmitter P is powered along the signal line l 1 , l 2 by a source E. Field-effect transistor F1 is only energized when a short-duration pulse is supplied by FMV (or by a tunnel diode circuit) to its source electrode. The voltage at point T is such that F1 only becomes conductive during the presence of smoke, and then turns on the transistor A, which triggers thyristor SCR, energizing the alarm relay L. The amplifier supply is stabilized by Zener diode ZD. A diode bridge may be connected to the line terminals so that the transmitter P may be operated from lines of either polarity or from A.C. The ionization chambers may be replaced by sensors of temperature, moisture &c.
GB62602/69A 1968-12-26 1969-12-23 Alarm circuit Expired GB1298083A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9561468 1968-12-26
JP3401269 1969-05-03

Publications (1)

Publication Number Publication Date
GB1298083A true GB1298083A (en) 1972-11-29

Family

ID=26372801

Family Applications (1)

Application Number Title Priority Date Filing Date
GB62602/69A Expired GB1298083A (en) 1968-12-26 1969-12-23 Alarm circuit

Country Status (9)

Country Link
US (1) US3733596A (en)
CA (1) CA975856A (en)
CH (1) CH519760A (en)
DE (1) DE1964764B2 (en)
FI (1) FI55731C (en)
FR (1) FR2027150A1 (en)
GB (1) GB1298083A (en)
SE (1) SE355098B (en)
YU (1) YU32739B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50129292A (en) * 1974-03-30 1975-10-13

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961195A (en) * 1974-08-26 1976-06-01 Timothy John Newington Fire detector having means for heating the support member of an electrode to prevent formation of moisture thereon
JPS5538000Y2 (en) * 1975-10-03 1980-09-05
DE2638068C3 (en) * 1976-08-24 1986-11-13 Siemens AG, 1000 Berlin und 8000 München Fire alarm system with several detectors that can be operated via a message loop
DE2641489C2 (en) * 1976-09-15 1984-05-30 Siemens AG, 1000 Berlin und 8000 München Method for the transmission of measured values in a fire alarm system
JPS5760147Y2 (en) * 1977-07-04 1982-12-22
US4207558A (en) * 1978-04-03 1980-06-10 Pittway Corporation Interconnection circuit for a plurality of alarm units
JPS5831275Y2 (en) * 1978-08-26 1983-07-11 ホーチキ株式会社 ionization smoke detector
US5898369A (en) * 1996-01-18 1999-04-27 Godwin; Paul K. Communicating hazardous condition detector
EP1344069B1 (en) * 2000-12-20 2007-08-22 Metrix Instrument Company Impact transmitter for reciprocating machines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2877453A (en) * 1956-01-17 1959-03-10 Jr Alfred L Mendenhall Smoke detecting device
BE564961A (en) * 1957-02-19
US3018376A (en) * 1957-11-29 1962-01-23 Nat Res Corp Gas density measurement
NL298945A (en) * 1962-10-12
US3555532A (en) * 1968-10-29 1971-01-12 Graham Stuart Corp Vapor or particle detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50129292A (en) * 1974-03-30 1975-10-13

Also Published As

Publication number Publication date
SE355098B (en) 1973-04-02
DE1964764A1 (en) 1970-11-26
YU323069A (en) 1974-12-31
CH519760A (en) 1972-02-29
FI55731B (en) 1979-05-31
US3733596A (en) 1973-05-15
FR2027150A1 (en) 1970-09-25
CA975856A (en) 1975-10-07
FI55731C (en) 1979-09-10
YU32739B (en) 1975-06-30
DE1964764B2 (en) 1977-11-03

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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