ES381761A1 - Ionization smoke detector - Google Patents

Ionization smoke detector

Info

Publication number
ES381761A1
ES381761A1 ES381761A ES381761A ES381761A1 ES 381761 A1 ES381761 A1 ES 381761A1 ES 381761 A ES381761 A ES 381761A ES 381761 A ES381761 A ES 381761A ES 381761 A1 ES381761 A1 ES 381761A1
Authority
ES
Spain
Prior art keywords
smoke detector
ionization smoke
ionization
detector
fet
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
ES381761A
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
Priority claimed from JP7336169U external-priority patent/JPS483417Y1/ja
Application filed by Nittan Co Ltd filed Critical Nittan Co Ltd
Publication of ES381761A1 publication Critical patent/ES381761A1/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
    • 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

Abstract

In an ionization smoke detector constructed as shown, a capacitor 8 is connected between the gate and source electrodes of an FET 30 so as to reduce the sensitivity of the detector, i.e. to prevent an alarm due to, for example, cigarette smoke.
ES381761A 1969-07-22 1970-07-14 Ionization smoke detector Expired ES381761A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5736769 1969-07-22
JP7336169U JPS483417Y1 (en) 1969-08-04 1969-08-04

Publications (1)

Publication Number Publication Date
ES381761A1 true ES381761A1 (en) 1974-06-16

Family

ID=26398403

Family Applications (1)

Application Number Title Priority Date Filing Date
ES381761A Expired ES381761A1 (en) 1969-07-22 1970-07-14 Ionization smoke detector

Country Status (5)

Country Link
DE (1) DE2034419B2 (en)
ES (1) ES381761A1 (en)
FR (1) FR2055344A5 (en)
GB (1) GB1273307A (en)
NL (1) NL7010165A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE874157A (en) * 1979-02-14 1979-05-29 Inst Nat Radio Elements ION DETECTOR

Also Published As

Publication number Publication date
GB1273307A (en) 1972-05-10
FR2055344A5 (en) 1971-05-07
NL7010165A (en) 1971-01-26
DE2034419B2 (en) 1972-12-07
DE2034419A1 (en) 1971-02-04

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