Factors to be considered in the selection of electromagnetic flowmeters

Abstract: Information on factors to be considered in the selection of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. The electromagnetic flowmeter has maintained a high market share due to its incomparable advantages. Its structure is simple, and the fluid flows through the flow meter without pressure loss; it can measure the liquid-solid two-phase flow of dirty medium, turbid medium and corrosive medium; it has been measured. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the factors to be considered in the selection of electromagnetic flowmeters. The electromagnetic flowmeter has maintained a high market share due to its incomparable advantages. Its structure is simple, the fluid flowing through the flow meter will not produce pressure loss; it can measure the liquid-solid two-phase flow of dirty medium, turbid medium and corrosive medium; the measurement process is not easily affected by the density, temperature and viscosity of the liquid; the speed measurement range is relatively wide. Although the electromagnetic flowmeter is constantly improving, there are still some shortcomings: it cannot measure steam, gas and gas-liquid two-phase media; it is easily affected by external magnetic field interference; it cannot measure media with low conductivity, such as organic solvents or dairy products. 1.1 The premise of using the electromagnetic flowmeter of liquid conductivity must be conductive and cannot be lower than the threshold value. The threshold value of conventional flowmeters is generally 10-4 ~ 10-s/m, which should be determined according to the model. Organic solvents and petroleum products have low electrical conductivity, so they cannot be measured by electromagnetic flowmeters. As a rule of thumb, the conductivity of the liquid under test should be at least an order of magnitude greater than the threshold specified by the meter manufacturer. Otherwise, it is easy to cause shaking. 1.2 Accuracy grade The error of high precision electromagnetic flowmeter is approximately±0.5%～±1%, a flowmeter with low accuracy is approximately±1.5%～±2.5%, and the price also differs by about 2 times. Therefore, the flow meter should be selected reasonably, and in places where the accuracy requirement is not high, the lower price should be used to reduce the cost. Some flowmeters have higher accuracy, but the installation conditions are very high, such as the temperature of 20'C ~ 22°C, and even DC calibration is required to reduce the impact. 1.3 Selection of flow rate and caliber The caliber of the flowmeter may not be consistent with the pipe diameter, and should be determined according to the flow rate. The economical flow rate of the liquid in the pipeline is generally 1.5 to 3m/S. Under this flow rate, the diameter of the flowmeter and the diameter of the pipe can be the same. The upper-line flow velocity is theoretically unlimited, but if the lining cannot withstand the flushing of the fluid, it is recommended not to exceed 5m/s. For liquids that are easy to deposit and scale, the flow rate should be not less than 2m/s. 2. Factors affecting the accuracy of electromagnetic flow measurement If the electromagnetic flowmeter is improperly installed and used, the error will become larger and even damaged. 2.1 The choice of grounding ring and electrode material Faults are caused by the mismatch between the liquid under test and the electrode or grounding ring. In addition to the corrosion problem, this mismatch also has the surface effect of the electrode, mainly including: chemical reaction, polarization phenomenon, catalyst effect . Ground rings also suffer from these issues, but to a lesser extent. 2.2 The liquid in the pipe is not full. The pipe is not installed in the position of the flowmeter or the back pressure is insufficient, so that the liquid cannot fill the pipe, and the measured value is smaller than the actual value. If the dissatisfaction of the tube is serious and the electrode leaks out of the liquid level, there is no way to measure the liquid. If the flow is plug flow or bubble flow, not only will the measurement be inaccurate, but the output will slosh due to the bubble hitting the electrode surface momentarily. 2.3 The liquid contains solid phase If the liquid contains particles, the possible failures are as follows: The surface of the electrode and the lining is covered with a deposit layer, the lining is worn, and the cross-sectional area of ​​the pipe becomes smaller. For some liquids that are easy to crystallize, when the fluid flows through the flowmeter, a layer of solid hangs on the inner wall. Since the use of other types of flowmeters also has the same problem, a flowmeter with a very short pipeline to be measured and easy to disassemble can be selected. It can be easily disassembled for maintenance after crystallization. 2.4 During installation, the positive and negative directions of the flowmeter should be consistent with the fluid flow. Avoid installing in places with strong magnetic fields. The flowmeter should not be placed at the highest point of the pipeline where it is not easy to accumulate gas, or in a vertical pipeline from top to bottom, which is prone to emptying. The liquid should not be vented directly to the atmosphere behind the flow meter, but there should be back pressure to prevent the pipe from filling up the pipe. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Factors to Consider in the Selection of Electromagnetic Flow Meters'
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