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JPS57187619A - Electro-magnetic flow meter - Google Patents

Electro-magnetic flow meter

Info

Publication number
JPS57187619A
JPS57187619A JP7136381A JP7136381A JPS57187619A JP S57187619 A JPS57187619 A JP S57187619A JP 7136381 A JP7136381 A JP 7136381A JP 7136381 A JP7136381 A JP 7136381A JP S57187619 A JPS57187619 A JP S57187619A
Authority
JP
Japan
Prior art keywords
electro
noises
magnetic induction
period
during
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
JP7136381A
Other languages
Japanese (ja)
Other versions
JPH0228806B2 (en
Inventor
Hitoshi Akiyama
Ichiu Suzuki
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.)
Yokogawa Electric Corp
Original Assignee
Hokushin Electric Works Ltd
Yokogawa Hokushin Electric Corp
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 Hokushin Electric Works Ltd, Yokogawa Hokushin Electric Corp filed Critical Hokushin Electric Works Ltd
Priority to JP7136381A priority Critical patent/JPH0228806B2/en
Publication of JPS57187619A publication Critical patent/JPS57187619A/en
Publication of JPH0228806B2 publication Critical patent/JPH0228806B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/60—Circuits therefor

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

PURPOSE:To remove noise components by sampling signals from electrodes during a pause period, exciting period and periods in those periods when electro- magnetic induction noises extinguish and calculating multiplication of a coefficient with four sample values for a specified length of time that are continuous. CONSTITUTION:An exciting coil 1 is excited by the signal 9 of a calculation control unit 7, and electrodes 3a and 3b provided on an insulation lead pipe 2 are connected to buffer amplifiers 4 and 5 and they are connected to a circuit 7 through a differential amplifier 6. The output of the amplifier 6 is sampled by an A/D converter 7a. The sampling is once during the exciting period of the coil 1 and three times during the pause period. Out of the three samplings during the pause period two samplings are taken when electro-magnetic induction noises have vanished. Each sample value is multiplied by a coefficient to effect addition calculation, and it is output as flow rate signal 11. Individual coefficients are set at values that offset respectively commercial frequency noises, electro-chemical direct current noises and electro-magnetic induction noises. With noises removed flow rate signal of extremely quick response can be obtained.
JP7136381A 1981-05-14 1981-05-14 DENJIRYURYOKEI Expired - Lifetime JPH0228806B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7136381A JPH0228806B2 (en) 1981-05-14 1981-05-14 DENJIRYURYOKEI

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7136381A JPH0228806B2 (en) 1981-05-14 1981-05-14 DENJIRYURYOKEI

Publications (2)

Publication Number Publication Date
JPS57187619A true JPS57187619A (en) 1982-11-18
JPH0228806B2 JPH0228806B2 (en) 1990-06-26

Family

ID=13458334

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7136381A Expired - Lifetime JPH0228806B2 (en) 1981-05-14 1981-05-14 DENJIRYURYOKEI

Country Status (1)

Country Link
JP (1) JPH0228806B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03256902A (en) * 1990-03-02 1991-11-15 Daifuku Co Ltd Article classifying equipment

Also Published As

Publication number Publication date
JPH0228806B2 (en) 1990-06-26

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