JPS6449916A - Mass flowmeter - Google Patents

Mass flowmeter

Info

Publication number
JPS6449916A
JPS6449916A JP20698487A JP20698487A JPS6449916A JP S6449916 A JPS6449916 A JP S6449916A JP 20698487 A JP20698487 A JP 20698487A JP 20698487 A JP20698487 A JP 20698487A JP S6449916 A JPS6449916 A JP S6449916A
Authority
JP
Japan
Prior art keywords
comparator
output
threshold value
detection signal
signal
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
JP20698487A
Other languages
Japanese (ja)
Inventor
Koyata Sugimoto
Akira Nakamura
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.)
Tokico Ltd
Original Assignee
Tokico 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 Tokico Ltd filed Critical Tokico Ltd
Priority to JP20698487A priority Critical patent/JPS6449916A/en
Publication of JPS6449916A publication Critical patent/JPS6449916A/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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/8472—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane
    • G01F1/8477—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having curved measuring conduits, i.e. whereby the measuring conduits' curved center line lies within a plane with multiple measuring conduits

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Measuring Volume Flow (AREA)

Abstract

PURPOSE:To obtain the high-accuracy mass flowmeter by removing a DC component due to a secular change to a sensor output when measuring the mass flow rate of fluid by utilizing Coriolis force. CONSTITUTION:A window comparator 36 compares one of inflow-side and outflow-side detection signals with a 1st threshold value and a 2nd threshold value smaller than it. A 1st comparator 44 generates an output when one detection signal is higher than the 1st threshold value. A 2nd comparator 45, on the other hand, compares the other detection signal with the 2nd threshold value and generates an output when the other detection signal is smaller. An integration circuit 38 integrates the difference signal between both detection signals when one detection signal is between the 1st and 2nd threshold values. A subtracting circuit 48 subtracts a half of the integrated value of the integration circuit 38 at the time of the output of the 2nd comparator 45 from the integrated value of the integration circuit 38 at the time of the output of the 1st comparator 44 and outputs a signal proportional to the time difference between both detection signals. An amplitude control circuit 52 controls the amplitude of a duct.
JP20698487A 1987-08-20 1987-08-20 Mass flowmeter Pending JPS6449916A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20698487A JPS6449916A (en) 1987-08-20 1987-08-20 Mass flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20698487A JPS6449916A (en) 1987-08-20 1987-08-20 Mass flowmeter

Publications (1)

Publication Number Publication Date
JPS6449916A true JPS6449916A (en) 1989-02-27

Family

ID=16532251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20698487A Pending JPS6449916A (en) 1987-08-20 1987-08-20 Mass flowmeter

Country Status (1)

Country Link
JP (1) JPS6449916A (en)

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