Magnetic induction flowmeter and method for determining the existence of a fully formed rotationally symmetric flow profile
A magnetic induction and flow measurement technology, which is applied in the measurement of flow/mass flow, the application of electromagnetic flowmeters to detect fluid flow, volume measurement, etc., can solve problems that cannot be completely prevented
Active Publication Date: 2020-03-17
ENDRESS HAUSER FLOWTEC AG
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This cannot be completely prevented, since for example some flow disturbances are caused by the structural condition of the pipeline
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[0061] Figure 16 A schematic diagram of a known flow measuring device 101 is shown, based on which the basic construction of a magnetic induction flow measuring device will now be discussed. The measuring tube 102 of the flow measuring device has a measuring tube axis 103 and a medium 111 flows through the measuring tube 102 . The medium 111 is electrically conductive, at least to a small extent. The measuring tube 102 is made of a non-conductive material, or is at least lined on its inner surface with a non-conductive material.
[0062] The magnetic field MF pointing perpendicularly to the measuring tube axis 103 is generated via a magnet system which generally consists of two coil arrangements 106 and 107—for example magnet coils arranged diametrically opposite each other on the measuring tube. Under the influence of the magnetic field MF, the charge carriers located in the medium 11 migrate according to polarity to the two oppositely polarized measuring electrodes 104 , ...
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A magnetic induction flowmeter (1) comprising: a measuring tube (2) having a measuring tube axis (3); and two measuring electrodes (4, 5) arranged radially opposite each other on the measuring tube ( 2) and tap signals from the two measuring electrodes to determine flow such as volume flow and / or flow velocity. Wherein the flowmeter (1) comprises four other electrodes (8a-11a), and these four other electrodes two by two (8a, 10a or 9a, 11a) are arranged radially opposite to each other on the measuring tube (2) and form the The second electrode axis (C) and the third electrode axis (F) intersected by the measuring tube axis (3); wherein the two electrode axes (C, F) are arranged to be in the second section plane (A) with the first electrode axis (A) The parallel projection on Q2) deviates by a clockwise or counterclockwise angular magnitude less than or equal to π / 2 radians, and wherein the magnetic inductive flowmeter comprises an evaluation unit implemented based on the measurement from two electrode axes (C, F) Measurement signal (E 2 ,E 3 ,E 4 ,E 5 ) to detect a flow profile, and a method for detecting the presence of a fully formed rotationally symmetric flow profile in the case of flow measurement, and a method for compensating flow profile-related measurement errors in the case of flow measurement with a magnetically inductive flowmeter (1) method.
Description
technical field [0001] The present invention relates to a magnetic induction flow measurement apparatus and method for determining the presence of a fully formed rotationally symmetric flow profile, and to a method for compensating flow profile related measurement errors in flow measurement. Background technique [0002] Flow disturbances may occur in the case of flow measurements. This cannot be completely prevented since, for example, some flow disturbances are caused by the structural condition of the pipeline. In general, it is advisable, for example, to place the flow measurement device in the pipeline at least some distance from disturbance-causing features, such as elbows or diaphragms, to ensure that measurement errors are minimized. [0003] However, since flow disturbances can also have different effects depending on the flow velocity, and disturbances can also vary over time, e.g. due to carbonate fouling in elbows, deposits on diaphragms, etc. This is of intere...
Claims
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IPC IPC(8): G01F1/58G01F15/02
CPCG01F15/022G01F1/58G01F25/10G01F1/588
Inventor 托马斯·布德米格
Owner ENDRESS HAUSER FLOWTEC AG