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1. WO2017021198 - METHOD FOR ASCERTAINING A PHYSICAL PARAMETER OF A GAS

Publication Number WO/2017/021198
Publication Date 09.02.2017
International Application No. PCT/EP2016/067716
International Filing Date 26.07.2016
IPC
G01F 1/84 2006.01
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Coriolis or gyroscopic mass flowmeters
G01N 9/00 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
9Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
G01F 15/04 2006.01
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
15Details of, or accessories for, apparatus of groups G01F1/-G01F13/104
02Compensating or correcting for variations in pressure, density, or temperature
04of gases to be measured
CPC
G01F 1/8436
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Gyroscopic mass flowmeters
8409constructional details
8436signal processing
G01F 1/8468
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
76Devices for measuring mass flow of a fluid or a fluent solid material
78Direct mass flowmeters
80operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
84Gyroscopic mass flowmeters
845arrangements of measuring means, e.g., of measuring conduits
8468vibrating measuring conduits
G01F 15/04
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
15Details of, or accessories for, apparatus of the preceding groups insofar as such details or appliances are not adapted to particular types of such apparatus
02Compensating or correcting for variations in pressure, density or temperature
04of gases to be measured
G01N 2009/006
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
9Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
002using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
006vibrating tube, tuning fork
G01N 9/002
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
9Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
002using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
Applicants
  • ENDRESS+HAUSER FLOWTEC AG [CH]/[CH]
Inventors
  • ZHU, Hao
  • RIEDER, Alfred
  • ECKERT, Gerhard
Agents
  • ANDRES, Angelika
Priority Data
10 2015 112 737.703.08.2015DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) VERFAHREN ZUM ERMITTELN EINES PHYSIKALISCHEN PARAMETERS EINES GASES
(EN) METHOD FOR ASCERTAINING A PHYSICAL PARAMETER OF A GAS
(FR) PROCÉDÉ DE DÉTERMINATION D'UN PARAMÈTRE PHYSIQUE D'UN GAZ
Abstract
(DE)
Die Erfindung betrifft ein Verfahren zum Ermitteln eines physikalischen Parameters eines Gases mittels eines Messaufnehmers mit mindestens einem Messrohr zum Führen des Mediums, wobei das Messrohr zu Biegeschwingungen verschiedener Moden mit unterschiedlichen Eigenfrequenzen anregbar ist, wobei das Verfahren die folgenden Schritte umfasst: Ermitteln der Eigenfrequenz des f1-Modes und des f3-Modes (110); Ermitteln vorläufiger Dichtewerte (120) für das im Messrohr geführte Gas auf Basis der Eigenfrequenzen des f1-Modes und des f3-Modes; Ermitteln eines Werts für die Schallgeschwindigkeit des im Messrohr geführten Gases, und/oder zumindest eines von der Schallgeschwindigkeit und der Eigenfrequenz eines Modes abhängigen Korrekturterms (130) und/oder Dichtefehlers für den vorläufigen Dichtewert, der auf Basis der Eigenfrequenz des Modes ermittelt wurde, zum Bestimmen eines korrigierten Dichtemesswerts (140); und/oder eines Korrekturterms für einen vorläufigen Massedurchflusswert zum Bestimmen eines korrigierten Massedurchflussmesswerts auf Basis des ersten vorläufigen Dichtewerts, des zweiten vorläufigen Dichtewerts, der Eigenfrequenz des f1 -Modes und der Eigenfrequenz des f3-Modes.
(EN)
The invention relates to a method for ascertaining a physical parameter of a gas using a measuring sensor with at least one measuring tube for conducting the medium, wherein flexural vibrations of different modes with different natural frequencies can be excited in the measuring tube. The method has the following steps: ascertaining the natural frequency of the f1 mode and the f3 mode (110); ascertaining previous density values (120) for the gas being conducted in the measuring tube on the basis of the natural frequencies of the f1 mode and the f3 mode; and ascertaining a value for the speed of sound of the gas conducted in the measuring tube and/or at least one correction term (130) and/or density error, which is dependent on the speed of sound and the natural frequency of a mode, for the previous density value, which has been ascertained on the basis of the natural frequency of the mode, in order to determine a corrected density measurement value (140) and/or a correction term for a previous mass flow rate value in order to determine a corrected mass flow rate measurement value on the basis of the first previous density value, the second previous density value, the natural frequency of the f1 mode, and the natural frequency of the f3 mode.
(FR)
L'invention concerne un procédé de détermination d'un paramètre physique d'un gaz au moyen d'un capteur de mesure comprenant au moins un tube de mesure destiné à guider le milieu, le tube de mesure pouvant être excité pour obtenir des vibrations de flexion de différents modes présentant différentes fréquences propres. Le procédé comprend les étapes suivantes consistant à : déterminer la fréquence propre du mode f1 et du mode f3 (110) ; déterminer des valeurs de densité (120) provisoires pour le gaz guidé dans le tube de mesure sur la base des fréquences propres du mode f1 et du mode f3 ; déterminer une valeur pour la vitesse du son du gaz guidé dans le tube de mesure, et/ou d'au moins un terme de correction (130) dépendant de la vitesse du son et de la fréquence propre d'un mode et/ou d'une erreur de densité pour la valeur de densité provisoire, qui a été déterminée sur la base de la fréquence propre du mode, pour déterminer une valeur de mesure de densité corrigée (140) ; et/ou d'un terme de correction pour une valeur de débit massique provisoire pour déterminer une valeur de mesure de débit massique corrigée sur la base de la première valeur de densité provisoire, de la deuxième valeur de densité provisoire, de la fréquence propre du mode f1 et de la fréquence propre du mode f3.
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