ES378081A1 - Ionization smoke detector - Google Patents

Ionization smoke detector

Info

Publication number
ES378081A1
ES378081A1 ES378081A ES378081A ES378081A1 ES 378081 A1 ES378081 A1 ES 378081A1 ES 378081 A ES378081 A ES 378081A ES 378081 A ES378081 A ES 378081A ES 378081 A1 ES378081 A1 ES 378081A1
Authority
ES
Spain
Prior art keywords
leakage current
smoke detector
gate leakage
drain
transistor
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
ES378081A
Other languages
Spanish (es)
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.)
Nittan Co Ltd
Original Assignee
Nittan 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 Nittan Co Ltd filed Critical Nittan Co Ltd
Publication of ES378081A1 publication Critical patent/ES378081A1/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)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

In an ionization smoke detector, an F. E. T. (junction type) has its gate 14 connected to the junction 10 of a reference ionization chamber 2 and a test chamber 4, and an arrangement is provided for limiting the gate leakage current Igs below a predetermined value to prevent faulty operation. As shown, a Zener diode 24 is provided in the source circuit to limit the drain current Id and thereby the gate leakage current. In an alternative, Fig. 3 (not shown), a transistor (40) has its collector-emitter path connected between the drain electrode and the + voltage terminal, and a Zener diode (50) is connected between the base of the transistor and the source electrode of the F. E.T. to limit the source-drain voltage and thereby the gate leakage current.
ES378081A 1969-06-16 1970-03-31 Ionization smoke detector Expired ES378081A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4688669 1969-06-16
JP4688769 1969-06-16

Publications (1)

Publication Number Publication Date
ES378081A1 true ES378081A1 (en) 1972-12-01

Family

ID=26387034

Family Applications (1)

Application Number Title Priority Date Filing Date
ES378081A Expired ES378081A1 (en) 1969-06-16 1970-03-31 Ionization smoke detector

Country Status (9)

Country Link
US (1) US3718919A (en)
AT (1) AT301398B (en)
DE (1) DE2029752B2 (en)
ES (1) ES378081A1 (en)
FR (1) FR2054574B1 (en)
GB (1) GB1254839A (en)
IL (1) IL34107A (en)
NL (1) NL150595B (en)
SE (1) SE348576B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2130445C3 (en) * 1971-06-19 1981-06-04 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Circuit arrangement for line circuits used for reporting and signaling
US4020415A (en) * 1974-12-30 1977-04-26 Unitec, Inc. Combustion product indicator
CH586941A5 (en) * 1975-07-25 1977-04-15 Cerberus Ag
USRE30117E (en) * 1975-07-25 1979-10-16 Cerberus Ag Ionization-type fire or smoke sensing system
US4083037A (en) * 1975-12-08 1978-04-04 Patent Development & Management Company Detection circuit

Also Published As

Publication number Publication date
FR2054574B1 (en) 1973-03-16
AT301398B (en) 1972-09-11
FR2054574A1 (en) 1971-04-23
IL34107A0 (en) 1970-05-21
SE348576B (en) 1972-09-04
GB1254839A (en) 1971-11-24
US3718919A (en) 1973-02-27
NL7004720A (en) 1970-12-18
DE2029752B2 (en) 1971-12-02
DE2029752A1 (en) 1971-01-07
NL150595B (en) 1976-08-16
IL34107A (en) 1972-09-28

Similar Documents

Publication Publication Date Title
GB1127807A (en) Time delay circuit
GB946929A (en) A voltage comparator including semiconductor current amplifiers
GB938948A (en) Internal combustion engine ignition systems
ES378081A1 (en) Ionization smoke detector
GB789429A (en) Improvements in electric circuits employing transistors
JPS5679463A (en) Semiconductor integrated circuit
GB919015A (en) Transistor emitter follower
GB937591A (en) Improvements in or relating to transistor circuit arrangements
US3714433A (en) Ionization smoke detector
GB1270515A (en) Improvements in field effect transistor counter
ES361970A1 (en) Marginal switching arrangement
GB1282536A (en) Ionization smoke detectors
SU438109A1 (en) Key
GB939599A (en) Improvements in or relating to monostable transistorized trigger circuits
ES379418A1 (en) Amplifier circuits
SU454572A1 (en) Fire detector
JPS5640279A (en) Semiconductor integrated circuit
SU620015A1 (en) Threshold-device
ES249107A1 (en) Improvements in electrical circuits that include transistors or relative to themselves (Machine-translation by Google Translate, not legally binding)
GB1242540A (en) Static gating circuits
GB913757A (en) Semi-conductor time delay units
ES397660A1 (en) Protection circuit
JPS5757029A (en) Semiconductor switch
FR1454806A (en) Transistor
ES275254A1 (en) Multiple function circuit