Several causes of errors in electromagnetic flow meters

by:Kaidi Sensors     2022-09-12
Abstract: The information on several causes of errors in electromagnetic flowmeter meters is provided by excellent flowmeter and flowmeter manufacturers. Electromagnetic flowmeters have many advantages, but if the type selection, installation and use are improper, the error will increase, the indication value will be unstable, and even the meter body will be damaged. Next, I will introduce several reasons for the error of the flowmeter: (1) The liquid contains solid liquid. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. Below are the details of several articles that cause errors in electromagnetic flowmeters. Electromagnetic flowmeters have many advantages, but if the type selection, installation and use are improper, the error will increase, the indication value will be unstable, and even the meter body will be damaged. Next, I will introduce you to several reasons for the error of the flowmeter: (1) The liquid contains solids such as powder, particles or fibers. The liquid contains solids such as powder, particles or fibers, which may cause failures; ① Slurry noise; ② Contamination on the electrode surface ; ③ The conductive deposition layer or insulating deposition layer covers the electrode or the lining; ④ The lining is worn or covered by sediment, and the flow cross-sectional area is reduced. (2) 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. Since the conduits transporting fluids have good heat tracing and insulation, they will not crystallize during thermal insulation work. However, it is difficult to carry out heat tracing and heat preservation in the measuring tube of the electromagnetic flow sensor. Therefore, when the fluid flows through the measuring tube, it is easy to cause a layer of solid on the inner wall due to the temperature drop. 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”(oring) the electromagnetic flowmeter sensor, and strengthen the heat tracing and insulation of the upstream pipeline of the flowmeter. 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. (3) The liquid in the tube is not full. Due to insufficient back pressure or poor installation position of the flow sensor, 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 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. If the situation is more serious, so that the liquid level is below the electrode, the output over-full scale phenomenon will occur. (4) Problems caused by improper selection of electrode and grounding ring materials. The electromagnetic flowmeter that is in contact with the medium and the parts that are in contact with the medium that cause failures include electrodes and grounding rings. In addition to the corrosion resistance problem, as long as the electromagnetic flowmeter is in contact with the medium due to improper matching Electrode surface effects. 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 the surface of the electrode, 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, there may also be a shaking phenomenon. 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 cannot be ideal, so many times I encountered low-level distilled water or deodorized water. Ionized water, whose conductivity is close to the lower limit of 5 specified by the electromagnetic flowmeter specification, has output shaking during use. It is generally considered that the lower limit of conductivity for stable measurement is 1 to 2 orders of magnitude higher. It is very important to maintain the electromagnetic flowmeter. On the one hand, it can prolong its service life, and on the other hand, it can ensure its normal use, and its use will not be affected by insufficient maintenance. This kind of flowmeter generally measures liquid medium and gas medium. These mediums have some chemical components more or less. If they are not maintained, it will cause certain corrosion to the flowmeter. Therefore, maintenance work is unavoidable. Regular maintenance can make the electromagnetic flowmeter serve people's measurement work for a long time. In the process of maintenance, as long as you do it carefully and carefully. 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 Errors in Electromagnetic Flow Meters'
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