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Electromagnetic flow meter with fluid impedance measurement

An electromagnetic flowmeter, electromagnetic flow technology, applied in the direction of fluid resistance measurement, application of electromagnetic flowmeter to detect fluid flow, volume/mass flow generated by electromagnetic effect, etc. Impedance and other issues to achieve the effect of easy control and monitoring

Inactive Publication Date: 2014-02-19
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrode impedance measurement method proposed in this patent does not consider the fact that the input impedance of the measuring amplifier is much greater than the impedance between the two electrodes, even in the case of electrode pollution or empty pipes
In this way, the electrode impedance measurement method proposed in this patent is actually difficult to distinguish fluid conductivity changes, electrode contamination and empty pipe conditions

Method used

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  • Electromagnetic flow meter with fluid impedance measurement
  • Electromagnetic flow meter with fluid impedance measurement
  • Electromagnetic flow meter with fluid impedance measurement

Examples

Experimental program
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Effect test

Embodiment 1

[0024] See figure 1 , This electromagnetic flowmeter with fluid impedance measurement includes: an electromagnetic flow sensor 1 with a pipe diameter D to allow the measured fluid Q to pass. The electromagnetic flow sensor 1 has an excitation magnetic field B applied to the measured fluid Q, corresponding to the fluid Q The flow velocity V of the electromagnetic flow sensor 1 produces an induced potential E0 of amplitude proportional to the flow velocity V between the two measuring electrodes P1 and P2 =K0×D×B×V, where K0 is a coefficient; a controllable excitation potential 2 produces The internal resistance r1 and the excitation potential E1 of the alternating frequency f; the induced potential E0 and the excitation potential E1 are connected in series to form two signal terminals a and b; it is characterized in that the signal terminals a and b are input to a multiplier K3 Flow signal amplifier 3; the signal terminals a and b are respectively coupled to an impedance signal am...

Embodiment 2

[0035] The second embodiment: This embodiment is basically the same as the first embodiment, and the special features are as follows:

[0036] in figure 2 As shown, the resistances Ra and Rb can be implemented with digitally controlled potentiometers, and can be adjusted to the required resistance value according to actual needs, thereby improving the measurement accuracy.

[0037] In this embodiment, the selection of the frequency f of the excitation signal generated by the controllable excitation potential 2 is described.

[0038] The impedance signal amplifier 4 used for electrode impedance measurement is capacitively coupled to the fluid signal measurement circuit. The capacitive reactance of the coupling capacitor at the magnetic excitation frequency needs to be large enough, while the capacitive reactance at the alternating frequency f needs to be larger. small. Therefore, the electrical excitation alternating frequency f is generally larger than the magnetic excitation frequ...

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Abstract

The invention provides an electromagnetic flow meter with fluid impedance measurement. The electromagnetic flow meter comprises an electromagnetic flow meter sensor connected with a flow signal amplifier through controllable excitation potential, and connected with an impedance signal amplifier through a capacitor Ca and a capacitor Cb. When an excitation magnetic field exists, ends of an electric pole P1 and an electric pole P2 of the electromagnetic flow meter sensor generate the induced electromotive force E0 in direct proportion to the fluid flow velocity V, and the induced electromotive force E0 of the ends of the electric pole P1 and the electric pole P2 is connected with the excitation potential E1 generated by the controllable excitation potential in series for forming a signal end a and a signal end b. The flow signal amplifier is directly connected with the signal end a and the signal end b, and the fluid flow velocity V is measured when the excitation potential E1 is equal to 0; meanwhile, the impedance signal amplifier is connected with the signal end a and the signal end b through coupling of the capacitor Ca and the capacitor Cb, when the excitation magnetic field B is equal to 0, a signal U4 is output for estimating fluid impedance Z0, and the information about the change of fluid conductivity, electric pole pollution and a blank pipe of a measuring pipe can be obtained through the signal U4.

Description

Technical field [0001] The invention relates to an electromagnetic flowmeter with fluid impedance measurement, in particular to a dual excitation electromagnetic flowmeter that uses a controllable excitation source based on a photocell to generate additional AC excitation potential. The flow rate of fluid is measured under magnetic excitation and under electrical excitation. Perform electrode impedance measurement. The present invention particularly relates to an electromagnetic flowmeter that performs fluid conductivity measurement, detects the adhesion of electrode insulators, and determines whether the tube is empty based on the measured impedance value of the electrode. technical background [0002] The electromagnetic flowmeter is a measurement equation based on the induced electromotive force that is proportional to the flow rate generated by the fluid cutting the magnetic line of force in the state of magnetic field excitation, and accordingly forms a measurement system in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/58G01R27/22
Inventor 李斌陈洁崔文华徐涛平张欣
Owner SHANGHAI UNIV
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