JPS5555247A - Ionization system smoke sensor - Google Patents

Ionization system smoke sensor

Info

Publication number
JPS5555247A
JPS5555247A JP12900778A JP12900778A JPS5555247A JP S5555247 A JPS5555247 A JP S5555247A JP 12900778 A JP12900778 A JP 12900778A JP 12900778 A JP12900778 A JP 12900778A JP S5555247 A JPS5555247 A JP S5555247A
Authority
JP
Japan
Prior art keywords
smoke
response properties
ionization
ionization chambers
electrodes
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.)
Pending
Application number
JP12900778A
Other languages
Japanese (ja)
Inventor
Tsunehiko Araki
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP12900778A priority Critical patent/JPS5555247A/en
Publication of JPS5555247A publication Critical patent/JPS5555247A/en
Pending legal-status Critical Current

Links

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  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

PURPOSE: To improve reliability, by mounting two ionization chambers separately.
CONSTITUTION: Two ionization chambers 2f, 2s are installed which are manufactured so that the same V-I characteristics be obtained by making the shape, radiation source quantity, etc. of electrodes a, b identical while response properties to smoke are differ by enlarging one opening portion 10 more than the other opening portion 11, and the electrodes a, b are connected to an alarm device 9 through an amplifier 4, a differential amplifier 5, threshold discriminating circuits 6, 7 and an AND circuit 8. Consequently, the ionization current reducing rates of the ionization chambers 2f, 2s by smoke are affected only by the concentration of smoke under a stationary condition and have no connection with the response properties, but the rates change according to the extent of the openings when air curretns, thus decreasing the possibility of false operation to strong air currents without lowering the response properties of this sensor to smoke.
COPYRIGHT: (C)1980,JPO&Japio
JP12900778A 1978-10-18 1978-10-18 Ionization system smoke sensor Pending JPS5555247A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12900778A JPS5555247A (en) 1978-10-18 1978-10-18 Ionization system smoke sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12900778A JPS5555247A (en) 1978-10-18 1978-10-18 Ionization system smoke sensor

Publications (1)

Publication Number Publication Date
JPS5555247A true JPS5555247A (en) 1980-04-23

Family

ID=14998844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12900778A Pending JPS5555247A (en) 1978-10-18 1978-10-18 Ionization system smoke sensor

Country Status (1)

Country Link
JP (1) JPS5555247A (en)

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