JPS57133346A - Gas alarm - Google Patents

Gas alarm

Info

Publication number
JPS57133346A
JPS57133346A JP2057181A JP2057181A JPS57133346A JP S57133346 A JPS57133346 A JP S57133346A JP 2057181 A JP2057181 A JP 2057181A JP 2057181 A JP2057181 A JP 2057181A JP S57133346 A JPS57133346 A JP S57133346A
Authority
JP
Japan
Prior art keywords
magnetic flux
coil
main magnetic
sensor
primary
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.)
Granted
Application number
JP2057181A
Other languages
Japanese (ja)
Other versions
JPH0256627B2 (en
Inventor
Yasuyuki Makino
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.)
SUN EH ELECTRIC CO
Sun Eh Electric Co Ltd
Original Assignee
SUN EH ELECTRIC CO
Sun Eh Electric 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 SUN EH ELECTRIC CO, Sun Eh Electric Co Ltd filed Critical SUN EH ELECTRIC CO
Priority to JP2057181A priority Critical patent/JPS57133346A/en
Publication of JPS57133346A publication Critical patent/JPS57133346A/en
Publication of JPH0256627B2 publication Critical patent/JPH0256627B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Emergency Alarm Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE:To enable miniaturize and lighten a device, by forming a transformer and buzzer into an electromagnetically monolithical unity. CONSTITUTION:A primary coil 2, a heater coil 3, and a primary compensating coil 5 are connected in series to a power source 10. Then, a main magnetic flux emanates in a main magnetic circuit 1, a sensor 8 is heated, and simultaneously, voltages of a secondary coil 4 and a primary compensating coil 5 are applied to the opposite ends of the sensor 8. If, with this, gas is detected, the opposite ends of the sensor 8 are sharply reduced in impedance, the secondary coil 4 and the primary compensating coil 5 are brought to a short-circuit condition to increase a main magnetic flux. A magnetic flux 9, which is a vector sum of a main magnetic flux, generated by said increase and a short-circuit current, and a magnetic flux in a reverse direction, flows to a vibrating plate 6 which rumbles to sound a gas alarm.
JP2057181A 1981-02-12 1981-02-12 Gas alarm Granted JPS57133346A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2057181A JPS57133346A (en) 1981-02-12 1981-02-12 Gas alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2057181A JPS57133346A (en) 1981-02-12 1981-02-12 Gas alarm

Publications (2)

Publication Number Publication Date
JPS57133346A true JPS57133346A (en) 1982-08-18
JPH0256627B2 JPH0256627B2 (en) 1990-11-30

Family

ID=12030873

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2057181A Granted JPS57133346A (en) 1981-02-12 1981-02-12 Gas alarm

Country Status (1)

Country Link
JP (1) JPS57133346A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5162883U (en) * 1974-11-12 1976-05-18

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5162883U (en) * 1974-11-12 1976-05-18

Also Published As

Publication number Publication date
JPH0256627B2 (en) 1990-11-30

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