8 Reasons for Errors in Electromagnetic Flow Meters

Abstract: The information on the 8 reasons for the error of the electromagnetic flowmeter meter is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Everyone should be familiar with electromagnetic flowmeters, but it seems to be a simple thing, one by one, in fact, there are many mysteries in it, and problems often occur! Today, we will analyze and analyze the problems encountered in combination with field examples. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the 8 reasons for the error of the electromagnetic flowmeter meter. Everyone should be familiar with electromagnetic flowmeters, but it seems to be a simple thing, one head at a time, in fact, there are many mysteries in it, and there are often problems! Today, we will analyze and analyze how to deal with problems in combination with on-site examples. 1. The liquid to be tested contains air bubbles. This is a common phenomenon. It is caused by the external inhalation and the dissolution of the internal liquid. However, the electromagnetic flowmeter cannot distinguish between liquid and air bubbles. Therefore, if they are calculated and measured together, errors will occur. Solution: 1. As shown in the figure above, it is not easy to install at the highest point of the pipeline, so change the installation position. 2. If the installation position is not easy to replace, a gas collector can be installed upstream of the flowmeter to exhaust regularly. 2. The liquid to be tested is not full. It can be said that the non-full tube is an extreme case of containing air bubbles. Not only is the liquid in the tube not full, but the top contains a lot of air bubbles. If the liquid has not passed the electrode, the measurement result will be greatly reduced. This is an engineering design error. Solution: Figure 2 is the installation diagram for the correct installation of the electromagnetic flowmeter, keep in mind that it is accurate. 3. Short circuit effect of conductive deposition layer. Since the conductive material is gradually deposited, the flow signal is short-circuited. This type of failure usually does not appear in the debugging period, but only after a period of operation. Solution: Remove the flowmeter and clean the insulating layer, most of which are yellow rust, which is caused by the deposition of a large amount of iron oxide in the electrolyte. If it starts to operate normally, and the flow shows smaller and smaller over time, the possibility of such a failure should be analyzed. Fourth, encounter crystalline liquid. In the selection, we often encounter the medium is the material that is easy to crystallize. Although most materials can be measured normally at normal temperature, and the conduit has the effect of heat tracing and insulation. However, the sensor measuring tube inside the flowmeter does not have this function, so when the fluid flows through the measuring tube, a layer of solids is formed on the inner wall due to cooling. Solution: 1. Try to choose a flowmeter with a small measuring tube. 2. The disassembly is more complicated, so this kind of flowmeter is not recommended. 5. The liquid conductivity exceeds the allowable range. Since the output impedance of the electrode is determined by the conductivity of the liquid to be measured and the size of the electrode, when the conductivity is lower than the lower limit, the instrument cannot work normally, and the displayed value will shake. Solution: According to the above problems, the factory works normally after replacing the tantalum electrode electromagnetic flowmeter. 1. Select other low-conductivity electromagnetic flowmeters that meet the requirements, such as capacitive electromagnetic flowmeters. , Space electromagnetic interference. Generally speaking, if the cable between the sensor and the converter is long and there is strong electromagnetic interference around, the cable may introduce interference signals, form common mode interference, and cause display distortion, nonlinearity or large shaking. Solutions: 1. Try to stay away from strong magnetic fields (such as near large motors, large transformers and power cables). 2. Minimize the cable length and use shielding measures. 7. The fluid to be measured flows asymmetrically. Under normal circumstances, the flow velocity of the fluid in the pipeline is required to be axisymmetrically distributed, and the magnetic field is uniform. In fact, non-axisymmetric flow velocity distribution often occurs. When vortex flow occurs, it will affect the output and cause errors. Solution 1. There are enough straight pipe sections upstream to ensure that the flow velocity is distributed in concentric circles. 2. The inner diameter of the flowmeter should be the same as the inner diameter of the pipeline within a certain range of upstream and downstream, otherwise the flow velocity distribution will be uneven. 3. If the upstream straight pipe section is insufficient, a flow regulator can be installed, which can only partially compensate. Eight, the installation point vibration problem. The electromagnetic flowmeter has strict requirements on the vibration of the installation point, and must be installed in a place with small vibration, otherwise errors will occur. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. '8 Reasons for Errors in Electromagnetic Flow Meters'
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