scholarly journals The Influence of Admixtures to the Signal of an Electromagnetic Flow Meter

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 772 ◽  
Author(s):  
Juozapas Virbalis ◽  
Roma Račkienė ◽  
Miglė Kriuglaitė-Jarašiūnienė ◽  
Konstantinas Otas
Keyword(s):  
Measurement Error ◽  
Electric Conductivity ◽  
Magnetic Particles ◽  
Volume Concentration ◽  
Flow Direction ◽  
Flow Meter ◽  
Electromagnetic Flow ◽  
Particle Measurement ◽  
Electromagnetic Flow Meter ◽  
Nonmagnetic Particles

Measurement error in an electromagnetic flow meter appears if magnetic and electric properties of admixtures are different from that of the fluid. Expressions of the error, which depends on volume concentration, permeability, and electric conductivity of particles were obtained by approximating the particles’ shape as an ellipsoid. Components of the error, which appear inside particles and outside particles in active zone of flow meter, with any canal form are investigated. Expressions of the error are presented assuming that particles are oriented in various directions with respect of the flow direction and are spinning. Different cases of magnetic and electric admixtures properties are discussed. Error expression obtained for flows with nonconductive and nonmagnetic particles coincides with experimental and modelling results obtained by other explorers for flows with air bubbles. Magnetic particles with high electric conductivity are especially dangerous. Extra measurement error in this case greatly depends on the shape of the particle. Measurement error increases if particle shape differs from a sphere. The complementary measurement error can exceed the volume concentration of particles by ten times if the ratio between the longest and the shortest axes of ellipsoid exceeds 3.

Theory to Help the Use of Electromagnetic Flow Meters

2002 ◽  
Author(s):  
Xiao-Zhang Zhang
Keyword(s):  
Pipe Wall ◽  
Three Dimensional ◽  
Electromagnetic Properties ◽  
Reasonable Accuracy ◽  
Flow Meter ◽  
Flow Meters ◽  
Electromagnetic Flow ◽  
Gas Liquid Flow ◽  
Electromagnetic Flow Meter ◽  
Theory Research

Compared with other flow meters, the theory of electromagnetic flow meter is well developed. Until now, we are able to predict the three dimensional characteristics of this kind of flow meters with reasonable accuracy. This has given much help to the designers to improve the flow meters. On the other hand, the theory can offer a tool for the users of this kind of flow meters to judge the application situations, estimate the possible measurement error, etc. This paper introduces the recent work of the author on the theory of the electromagnetic flow meter. The basic physical conceptions and equations are given with a brief history review of the theory research. Several examples are given of using the theory to analyze the meters’ behavior in different application situations. They are: effect of the conducting pipe connections; errors caused by a pipe wall of different electromagnetic properties; gas-liquid flow and errors caused by a relative motion of the probe.

The Function of the Conus Arteriosus in the Port Jackson Shark, Heterodontus Portusjacksoni

1967 ◽  
Vol 46 (2) ◽  
pp. 373-382
Author(s):  
G. H. SATCHELL ◽  
M. P. JOHNES
Keyword(s):  
Blood Pressure ◽  
Ventricular Ejection ◽  
Flow Meter ◽  
Back Flow ◽  
Electromagnetic Flow ◽  
Ventricular Relaxation ◽  
Ventricular Systole ◽  
Ventral Aorta ◽  
Electromagnetic Flow Meter ◽  
Port Jackson

1. Blood pressure recordings were made above and below each of the three tiers of valves in the conus of Heterodontus portusjacksoni. Flow in the ventral aorta was recorded with an electromagnetic flow-meter. 2. It was shown that the lower conal valves close first and that this closure occurred before the end of ventricular systole. 3. The middle conal valves closed before the lower ones opened. The closure of both of these sets of valves was caused in part by the circumferential decrease due to conus systole, and in part by the back flow this engendered. 4. The upper conal valves closed as the middle ones opened at the end of conal systole. 5. Paralysing the conus with topical tricain rendered the lower and middle conal valves incompetent and caused the upper conal valves to be closed following ventricular relaxation with an increase in back flow. 6. The hypothesis is advanced that the conus serves to postpone the closure of the upper tier of valves until the negative intrapericardial pressure generated by ventricular ejection has decayed to a lower value.

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.

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