The cause of the error of the split electromagnetic flowmeter meter

Abstract: The information on the cause of the error of the split electromagnetic flowmeter meter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Electromagnetic flowmeter has many advantages. When measuring the volume flow of liquid, it is not affected by the temperature, pressure, density, viscosity, etc. of liquid, so it is favored by customers. However, if it is used irregularly, there will be errors, which will affect the measurement. result. . For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. Electromagnetic flowmeter has many advantages. When measuring the volume flow of liquid, it is not affected by the temperature, pressure, density, viscosity, etc. of liquid, so it is favored by customers. However, if it is used irregularly, there will be errors, which will affect the measurement. result. Below, the technical staff of the flowmeter summarizes years of work experience and concludes that the reasons for the error of the split electromagnetic flowmeter are mainly caused by the following aspects. 1. The liquid in the split electromagnetic flowmeter tube is not full due to insufficient back pressure or poor installation position of the flow sensor, so that the liquid in the measuring tube is not full, and 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 bubble 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 instantly covers the electrode surface; if the gas portion of the flow cross-sectional area increases in the stratified flow of the horizontal pipeline, that is, the degree of liquid underfilling increases, output sloshing will also occur. If the situation is more serious, so that the liquid level is below the electrode, the output over-full scale phenomenon will occur. This kind of failure reason is often encountered in the after-sales service case of the manufacturer, and it is an engineering design error. 2. The liquid contains solids. The liquid contains solids such as powder, particles or fibers, and the possible faults include: ① slurry noise; ② electrode surface contamination; ③ conductive deposition layer or insulating deposition layer covering the electrode or lining; ④ lining is worn Or covered by sediment, the flow cross-sectional area is reduced. If conductive material is deposited on the insulating lining of the measuring tube of the split electromagnetic flowmeter sensor, the flow signal will be short-circuited and the instrument will fail. Because the conductive material is gradually deposited, this type of failure usually does not appear during the commissioning period, but only after a period of operation. 3. There is crystallization in the liquid. The split electromagnetic flowmeter should be used with caution. Some chemical materials that are easy to crystallize can be measured normally under normal temperature conditions. Since the conduits transporting fluid have good heat tracing and insulation, they will not crystallize during insulation work. However, it is difficult for the measuring tube of the electromagnetic flow sensor to carry out heat tracing and heat preservation. Therefore, when the fluid flows through the measuring tube, it is easy to cause a layer of solid on the inner wall due to cooling. Since the measurement of flowmeters using other principles also has crystallization problems, in the absence of other better methods, one with a very short measuring tube length can be selected.“ring”Electromagnetic flow sensor, and strengthen the heat tracing and insulation of the upstream pipeline of the flow meter. In terms of the pipeline connection method, the flow sensor is considered to be easy to disassemble and assemble, and it can be easily disassembled and maintained once it is crystallized. 4. Problems caused by improper material selection of electrodes and grounding rings. The electromagnetic flowmeter that is in contact with the medium and the parts that are in contact with the medium will cause failures, including electrodes and grounding rings. In addition to the corrosion resistance problem, as long as the electrodes surface effect. Surface effects should include: ① chemical reaction (formation of blunt film on the surface, etc.); ② electrochemistry and polarization phenomenon (potential generation); ③ catalytic effect (aerosol generation on electrode surface, etc.). Ground rings also have these effects, but to a lesser extent. 5. Problems caused by the liquid conductivity exceeding the allowable range. If the liquid conductivity is close to the lower limit value, it may also shake. Because the lower limit specified by the manufacturer's instrument specification is the lowest value that can be measured under various conditions of use, and the actual conditions may not be ideal, so many times I encountered low-level distilled water or deionized water. Its conductivity is close to the lower limit of 5 specified by the electromagnetic flowmeter specification, but the output sloshes during use. It is generally considered that the lower limit of conductivity for stable measurement is 1 to 2 orders of magnitude higher. The conductivity of the liquid can be found in the relevant manuals, and if the data is lacking, the sample can be measured with a conductivity meter. But sometimes there are cases where samples are taken from the pipeline to be determined in the laboratory, but the actual split electromagnetic flowmeter cannot work.

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