Several Reasons for Error Production of Electromagnetic Flow Meters

Abstract: The information on several reasons for the error production of electromagnetic flowmeter meters is provided by excellent flowmeter and flowmeter production and quotation manufacturers. The liquid in the tube is not full. The liquid in the measuring tube is not full due to insufficient back pressure or poor installation position of the flow sensor. The failure phenomenon has different manifestations due to the degree of incompleteness and flow conditions. If a small amount of gas is in a stratified flow or wavy flow in the water pipe. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following are the details of several reasons for the error production of electromagnetic flowmeters. The liquid in the tube is not full. The liquid in the measuring tube is not full due to insufficient back pressure or poor installation position of the flow sensor. The failure phenomenon has different manifestations due to the degree of incompleteness and flow conditions. If a small amount of gas is in stratified flow or wavy flow in the water pipe, the fault phenomenon is that the error increases, that is, the flow measurement value does not match the actual value; if the flow is bubbly flow or plug flow, the fault phenomenon is that the measured value does not match the actual value. In addition, output sloshing will also occur because the gas phase covers the surface of the electrode instantly; if the gas phase part of the flow cross-sectional area increases in the stratified flow of the horizontal pipe, that is, the degree of liquid underfilling increases, output sloshing will also occur. The situation is more serious, so that the liquid level is below the electrode, and the output exceeds the full scale phenomenon. The liquid contains solids such as powder particles or fibers, which may cause failures; slurry noise (2) The surface of the electrode is contaminated; (3) The conductive deposition layer or insulating deposition layer covers the electrode or lining; (4) The lining is worn or covered with deposits, and the flow cross-sectional area is reduced. For liquids that may crystallize, electromagnetic flowmeters should be careful to use some chemical materials that are easy to crystallize. Some chemical materials that are easy to crystallize can be measured normally under normal temperature conditions. Because the conduits transporting fluids have good heat tracing and insulation, they will not crystallize when the temperature is normal, but electromagnetic The measuring tube of the flow sensor is difficult to carry out heat tracing and heat preservation. Therefore, when the fluid flows through the measuring tube, it is easy to cause the inner wall to form due to the temperature drop, and a very short measuring tube can be selected.“ring”Electromagnetic flow sensor, and strengthen the heat tracing and insulation of the upstream pipeline of the flow meter. In the pipeline connection method, the flow sensor is considered to be easy to disassemble and assemble, and once crystallization occurs, it can be easily disassembled and maintained. Problems Caused by Improper Material Selection of Electrodes and Grounding Rings Electromagnetic flowmeters and grounding rings are the parts that are in contact with the medium when the electromagnetic flowmeter fails due to the mismatch between the material and the measured medium. In addition to the corrosion resistance problem, the improper matching is mainly caused by the surface effect of the electrode. The surface effects include: (1) chemical reaction, the formation of passivation film on the surface, etc. (2) electrochemistry and polarization phenomenon, potential generation (3) catalyst action, generation of aerosol on the electrode surface, etc. Ground rings also have these effects, but to a lesser extent. Problems Caused by Liquid Conductivity Exceeding the Allowable Range If the liquid conductivity is close to the lower limit value, sloshing may occur. Because the lower limit specified by the manufacturer's instrument specification is the lowest value that can be measured under good conditions of use, and the actual conditions may not be ideal, so many times the measurement of low-level distilled water or deionized water has been encountered. , its conductivity is close to the lower limit of 5S/cm stipulated by the electromagnetic flowmeter specification, but the output shakes when used. It is generally considered that the lower limit of conductivity for stable measurement is 1-2 orders of magnitude higher. CO2 or NOX generates carbonic acid or sulfuric acid, and the conductivity increases. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Several Causes of Error Production of Electromagnetic Flow Meters'
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