JPS56141548A - Device for deciding electric resistance change rate of cast iron - Google Patents

Device for deciding electric resistance change rate of cast iron

Info

Publication number
JPS56141548A
JPS56141548A JP4467780A JP4467780A JPS56141548A JP S56141548 A JPS56141548 A JP S56141548A JP 4467780 A JP4467780 A JP 4467780A JP 4467780 A JP4467780 A JP 4467780A JP S56141548 A JPS56141548 A JP S56141548A
Authority
JP
Japan
Prior art keywords
electric resistance
cast iron
time
signal
change rate
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
JP4467780A
Other languages
Japanese (ja)
Inventor
Takanobu Nishimura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP4467780A priority Critical patent/JPS56141548A/en
Publication of JPS56141548A publication Critical patent/JPS56141548A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

PURPOSE:To separate noise and perform accurate measurement by operating the current value obtained by measuring the electric resistance of molten cast iron under progression of solidifying at every fixed time by a sample holding method, in a method of measuring said electric resistance and evaluating graphite spheroidization rate. CONSTITUTION:The AC current obtained from the primary side of transformer type cast iron electric resistance measuring device for using the molten cast iron cast in an annular mold as the secondary side coil is converted by a current-voltage conversion circuit and is rectified to a DC signal by a rectifying circuit. Then, the above-mentioned signal is held alternately in two sample holding circuits at every fixed time by changing over at every time by using a clock circuit and the difference between the signal of that time and the signal of the previous time is calculated in an arithmetic circuit. The resultant average change rate per time is displayed in a recorder via an amplifier. On the other hand, it is compared with reference voltage, and in the case of abnormality, it is alarmed (lamp lighting and buzzer announcing).
JP4467780A 1980-04-07 1980-04-07 Device for deciding electric resistance change rate of cast iron Pending JPS56141548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4467780A JPS56141548A (en) 1980-04-07 1980-04-07 Device for deciding electric resistance change rate of cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4467780A JPS56141548A (en) 1980-04-07 1980-04-07 Device for deciding electric resistance change rate of cast iron

Publications (1)

Publication Number Publication Date
JPS56141548A true JPS56141548A (en) 1981-11-05

Family

ID=12698068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4467780A Pending JPS56141548A (en) 1980-04-07 1980-04-07 Device for deciding electric resistance change rate of cast iron

Country Status (1)

Country Link
JP (1) JPS56141548A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115236135A (en) * 2021-04-23 2022-10-25 中国石油化工股份有限公司 Base line calibration method for gas sensor, control device and gas sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115236135A (en) * 2021-04-23 2022-10-25 中国石油化工股份有限公司 Base line calibration method for gas sensor, control device and gas sensor
CN115236135B (en) * 2021-04-23 2023-08-22 中国石油化工股份有限公司 Baseline calibration method for gas sensor, control device and gas sensor

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