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Electromagnetic flowmeter

An electromagnetic flowmeter and flow technology, which is applied in the field of range correction technology to achieve the effects of accurate flow measurement, elimination of range change factors, and accurate range correction

Inactive Publication Date: 2010-05-05
YAMATAKE HONEYWELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when a given time t1 elapses, the output of the electromagnetic flowmeter may become 1.2 (v), although the flow velocity of the fluid to be measured remains at 1 (m / s)

Method used

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Examples

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no. 1 example

[0148] Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. This embodiment uses the first extraction method among the methods described in association with the rationale, as the extraction The method of the vector Va of the component, and use the second correction method as the span correction method. The electromagnetic flowmeter according to this embodiment includes an exciting coil and a pair of electrodes, and has and Figure 21 Same configuration as conventional magmeter shown. Therefore, will use Figure 21 The reference numerals in are used to describe the principle of this embodiment.

[0149] refer to Figure 21 , in the magnetic field Ba generated by the excitation coil 3, the magnetic field component (magnetic flux density) B6 that is perpendicular to the electrode axis EAX and perpendicular to the measuring pipeline axis PAX on the electrode axis EAX connecting the electrodes 2a and 2b is given by t...

no. 2 example

[0217] Next, a second embodiment of the present invention will be described. This embodiment is the same as the first embodiment except that an excitation coil is added to the electromagnetic flowmeter, and this embodiment uses the first extraction method as the extraction The method of the vector Va of the component, and the second correction method is used as the span correction method. That is, the electromagnetic flowmeter of this embodiment includes two exciting coils and a pair of electrodes. If the second field coil to be added is placed on the same side as the first field coil, the resulting configuration is a redundant configuration of the first embodiment. Therefore, it is necessary to place the second exciting coil on a different side from the first exciting coil with respect to the plane including the electrodes.

[0218] Figure 6 is a block diagram of the principle of the electromagnetic flowmeter used in this embodiment. The electromagnetic flowmeter include...

no. 3 example

[0320] Next, a third embodiment of the present invention will be described. This embodiment is the same as the first embodiment except that a pair of electrodes are added to the electromagnetic flowmeter, and this embodiment uses the second extraction method as the extraction The method of the vector Va of the component, and the second correction method is used as the span correction method. That is, the electromagnetic flowmeter of this embodiment includes one exciting coil and two pairs of electrodes. If the second electrode to be added is placed on the same side as the existing first electrode, the resulting configuration is a redundant configuration of the first embodiment. Therefore, it is necessary to place the second electrode on a different side from the first electrode with respect to the excitation coil.

[0321] Figure 13 is a block diagram for explaining the principle of the electromagnetic flowmeter according to this embodiment. The electromagnetic flowmeter...

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Abstract

An electromagnetic flowmeter comprises a measuring tube (1) through which fluid to be measured flows, electrodes (2a, 2b) for detecting an electromotive force generated by a magnetic field being applied to the fluid and flow of the fluid, an exciting coil (3) including the electrodes (2a, 2b) for applying to the fluid a magnetic field asymmetric to a plane (PLN) perpendicular to the axial direction of the measuring tube, a signal converting section (5) for extracting deltaA / deltat component from the combined electromotive force of the deltaA / deltat component having no relation with the currentvelocity of the fluid and the vxB component caused by the current velocity of the fluid detected at the electrodes (2a, 2b), and a flow rate output section (6) for calculating the flow rate of the fluid by removing the variation factor of a span, which is a coefficient applied to the magnitude of current velocity of the vxB component in the combined electromotive force, according to the deltaA / deltat component. A magnetic field including a plurality of frequency components is applied to the fluid from the exciting coil (3).

Description

technical field [0001] The present invention relates to an electromagnetic flowmeter, and more particularly, to a span correction technique for correcting a coefficient applied to a flow rate of a component caused by a flow rate of a fluid to be measured in an interelectrode electromotive force detected by electrodes. Background technique [0002] A portion of logical propositions necessary for understanding the prior art and the present invention and common to the prior art and the present invention will be described. First, known basic mathematical knowledge will be described. [0003] A cosine wave P·cos(ω·t) and a sine wave Q·sin(ω·t) having the same frequency but different amplitudes are synthesized into the following cosine wave. Let P and Q be the amplitudes, and ω be the angular frequency. [0004] P·cos(ω·t)+Q·sin(ω·t)=(P 2 +Q 2 ) 1 / 2 ·cos(ω·t-ε) [0005] where ε=tan -1 (Q / P) …(1) [0006] To analyze the compositional operation of equation (1), it is conveni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/60G01F1/58
CPCG01F1/56G01F1/58G01F25/0007G01F1/60G01F25/10
Inventor 山本友繁
Owner YAMATAKE HONEYWELL CO LTD
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