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JPS57151823A - Electromagnetic flowmeter - Google Patents

Electromagnetic flowmeter

Info

Publication number
JPS57151823A
JPS57151823A JP3721381A JP3721381A JPS57151823A JP S57151823 A JPS57151823 A JP S57151823A JP 3721381 A JP3721381 A JP 3721381A JP 3721381 A JP3721381 A JP 3721381A JP S57151823 A JPS57151823 A JP S57151823A
Authority
JP
Japan
Prior art keywords
output
changes
signal
circuit
electrode
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
JP3721381A
Other languages
Japanese (ja)
Inventor
Yoshinori Matsunaga
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 JP3721381A priority Critical patent/JPS57151823A/en
Publication of JPS57151823A publication Critical patent/JPS57151823A/en
Pending 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 stabilize output signals of a converter by holding them for a fixed time detecting the generation of changes i the DC potential of an electrode. CONSTITUTION:Variations in a buffer amplifier 3 alone is attributed to a change in the DC potential of an electrode and similar variations in both amplifiers 3 and 3a correspond to changes in the flow rate signal. At this point, output signals of a detection circuit 4 are a pulse signal which rises at the time corresponding to the changes in the DC potential of the electrode and at the time corresponding to the changes in the flow rate signals. Output signals of a detection circuit 4a are a pulse signal which rises only once at the same time with the output signal of the detection circuit 4 corresponding to the changes in the flow rate signal. When given an output pulse of an exclusive OR circuit 5, a setting circuit 6 rises corresponding to the initial rise of the output signal of the circuit 4 and outputs a holding waveform for a fixed time. This enables a signal converted 2 from the output of an oscillator 1 having measuring electrodes 1a and 1b and a ground electrode 1c to be output from a circuit 7, once held for a fixed time.
JP3721381A 1981-03-17 1981-03-17 Electromagnetic flowmeter Pending JPS57151823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3721381A JPS57151823A (en) 1981-03-17 1981-03-17 Electromagnetic flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3721381A JPS57151823A (en) 1981-03-17 1981-03-17 Electromagnetic flowmeter

Publications (1)

Publication Number Publication Date
JPS57151823A true JPS57151823A (en) 1982-09-20

Family

ID=12491308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3721381A Pending JPS57151823A (en) 1981-03-17 1981-03-17 Electromagnetic flowmeter

Country Status (1)

Country Link
JP (1) JPS57151823A (en)

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