Research of Electromagnetic Flowmeter with Grounding Electrode

2013 ◽  
Vol 712-715 ◽  
pp. 1856-1862
Author(s):  
Song Gao ◽  
Bin Li ◽  
Shi Yi Yin
Keyword(s):  
Weight Function ◽  
Output Signal ◽  
Electromagnetic Flowmeter ◽  
Weight Functions ◽  
Flow Meter ◽  
Electrode Area ◽  
Electromagnetic Flow ◽  
Measurement Signal ◽  
Grounding Electrode ◽  
Electromagnetic Flow Meter

Grounding electrode electromagnetic flowmeter can reduce the loss of the measurement signal,and the conductivity lower medium can be measured if the area of the grounding electrode was increased. However, if the grounding electrode area is increased, the measurement signal will be reduced. The weight function theory of electromagnetic flow meter shows that the reason is the distribution of electromagnetic flow meter weight functions is changed by the grounding electrode, lead to the induced electromotive force every point of media in the pipeline contribution to the measuring electrode is changed. the weight function of the electromagnetic flowmeter which possesses one or two grounding electrodes was analyzed respectively, get the law of electromagnetic flowmeter output signal decreases with the increase of the grounding electrode area. Finally, the relationship of the electromagnetic flowmeter output signal and the ground electrode diameter accounted for measuring the ratio of the pipe been demonstrated. This theory and method has a certain significance to research and development grounding electrode electromagnetic flowmeter.

The Effect of Abscission of Insulation Lining of Electromagnetic Flowmeter on Output Signal

2012 ◽  
Vol 226-228 ◽  
pp. 1910-1915
Author(s):  
Song Gao ◽  
Bin Li ◽  
Shi Yi Yin ◽  
Xue Jing Li
Keyword(s):  
Output Signal ◽  
Short Circuit ◽  
Electromagnetic Flowmeter ◽  
Fluid Temperature ◽  
Flow Meter ◽  
Electromagnetic Flow ◽  
Electromagnetic Flow Meter ◽  
Pressure Changes ◽  
Relationship Of ◽  
The Relationship

In pipe of electromagnetic flowmeter must be installed internal insulation lining to prevent the electromagnetic flowmeter signal is short circuit by metal pipe. However, in the process of using the electromagnetic flow meter, insulation lining is easy to fall off because of the fluid temperature and pressure changes, thus lead to the output signal of the electromagnetic flowmeter is changed. The effect of electromagnetic flowmeter insulation lining fall off to the output signal is analyzed by the theory of electromagnetic flow meters weight function. Get the relationship of the output signal and the insulation lining drop area and position. The paper provides a theoretical analysis method for the effect abscission of insulation lining of electromagnetic flow meter on output signal.

Multi-Parameters Measurement Based on STM32 ARM of Dual-Excited Electromagnetic Flow Meter in Partially Filled Pipes

2013 ◽  
Vol 347-350 ◽  
pp. 682-685
Author(s):  
Ji Suo ◽  
Chun Qing Qi ◽  
Hong Bing Zhang
Keyword(s):  
Theoretical Analysis ◽  
Flow Velocity ◽  
Electromagnetic Flowmeter ◽  
Liquid Level ◽  
Flow Meter ◽  
Electromagnetic Flow ◽  
Signal Injection ◽  
Electromagnetic Flow Meter ◽  
Parameters Measurement

The dual-excited electromagnetic flowmeter with arc-electrodes in the paper can measures liquid level and flow velocity. A pair of electrodes is set as signal injection electrodes on the pipe bottom. AC signal injected used to determine liquid level. The theoretical analysis and experiment results indicate that it is feasible for partially filled pipes.

Electromagnetic Flow Meter Field Distribution Maximizing Device Sensitivity

2016 ◽  
Vol 856 ◽  
pp. 157-162
Author(s):  
Ilona Ilieva Iatcheva ◽  
Andrey Dimitrov Andreev ◽  
Rumena Dimitrova Stancheva ◽  
Ilonka Tityanova Lilyanova
Keyword(s):  
Magnetic Field ◽  
Field Distribution ◽  
Output Signal ◽  
Spline Interpolation ◽  
Magnetic Field Distribution ◽  
Geometrical Parameters ◽  
Flow Meter ◽  
Field Problem ◽  
Electromagnetic Flow ◽  
Electromagnetic Flow Meter

The presented paper deals with determination of the excited magnetic field magnitudes at different points around the device guarantying maximal output signal. Investigated object is electromagnetic flow meter. The output signal is polarization voltage through the circle cross section of the polarization transducer between its electrodes. Except the magnetic field distribution some geometrical parameters of the device and physical characteristic of the inside moving dielectric are varied. The forward field problem is solved by the use of the Comsol, version 5.0 software package. The inverse problem is solved using skills of the Response Surface Methodology (RSM), Design of Experiments (DOE) and Nonlinear Programming. The numerical approach for finding optimal magnetic field distribution is discrete at chosen points. Applying spline interpolation after that the analytical description of the optimal field distribution is defined.

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