Talking about the Correct Use of Electromagnetic Flow Meter

Abstract: The information on the correct use of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Electromagnetic flowmeter (Electromagnetic Flowmeter) is a kind of instrument that measures the volume flow of conductive liquid based on Faraday's law of electromagnetic induction. It can measure the volume flow of liquid or liquid and solid two-phase media with certain conductivity, such as acid, alkali, etc. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the article on the correct use of electromagnetic flowmeters. Electromagnetic flowmeter (Electromagnetic Flowmeter) is a kind of instrument that measures the volume flow of conductive liquid based on Faraday's law of electromagnetic induction. It can measure the volume flow of liquid or liquid and solid two-phase medium with certain conductivity, such as acid, alkali, salt solution slurry, mineral pulp, paper pulp, medicinal pulp, syrup, fruit pulp, plasma, sewage, etc. Because electromagnetic flowmeters have many characteristics. Therefore, it has been widely used in recent years. This paper puts forward some corresponding measures to deal with some problems in its use. 1 The measurement principle is known from the law of electromagnetic induction. When a conductor moves in a magnetic field and cuts the magnetic field lines. There is an induced potential in the conductor. The same is true. Conductive liquid that cuts magnetic lines of force in a magnetic field. An induced potential is also generated. When certain conditions are met, the induced potential is proportional to the average flow rate of the conductive liquid in the pipe. When the pipe diameter and magnetic induction remain unchanged, the induced potential has a linear relationship with the volume flow or average flow rate of the liquid to be measured. If an electrode is inserted on both sides of the liquid pipeline. The induced potential can be drawn. The flow rate can be obtained by measuring the magnitude of this induced potential. 2 Characteristics and applicable occasions of electromagnetic flowmeter Compared with other flowmeters, electromagnetic flowmeter has its unique advantages and specific application occasions. (1) The pressure loss is small. The measuring tube is a smooth straight tube with no obstruction flow detection element and movable parts, and does not produce pressure loss due to the detection flow. The resistance of the fluid is only the resistance along the pipeline of the same length, and the energy saving effect is remarkable. No mechanical inertia. Very responsive. It is suitable for the measurement of large-diameter liquid flow requiring low resistance loss. (2) The measurement range is wide. Turndown ratio is usually 20:1~50:1. Up to 100:1. Optional measurement range is wide. The liquid flow velocity of the full scale value can be 0.5~10m/s. The flow range is tens of cm³/h to several hundred thousand m³/h. Pipe diameters range from 2mm to 3000mm. Some types of meters can expand and reduce the flow rate f (for example, there is a 4-digit potentiometer to set the meter constant) on the spot as needed, and it is not necessary to remove it for off-line actual flow calibration. (3) Good linearity There is a linear relationship between the flow signal and the fluid volume flow. Therefore, the meter has a uniform scale, and the volume flow of the fluid has nothing to do with the physical properties of the medium (such as temperature, pressure, viscosity, density, etc.) and the flow state. After the electromagnetic flowmeter is calibrated with water, it can be used to measure the volume flow of other conductive liquids without correction. (4) The length of the front straight pipe section is required to be short. (5) It can be used for flow measurement of corrosive fluids. (6) Pulse flow can be measured. Of course, electromagnetic flowmeters also have their limitations and shortcomings (1) they cannot measure liquids with very low conductivity, such as petroleum products and organic solvents. (2) It cannot measure gas, steam and liquids containing many larger bubbles. General-purpose electromagnetic flowmeters cannot be used to measure liquids with high temperature and pressure due to the limitations of lining materials and electrical insulating materials. (3) When the flow rate and velocity distribution do not meet the set conditions, a large measurement error will occur (4) When the liquid flow rate is too low, it is difficult to amplify and measure the induced potential of the same order of magnitude as the interference signal. And the instrument is also prone to zero drift. Therefore, the lower limit of the full-scale flow velocity of the electromagnetic flowmeter shall generally not be lower than 0.3m/s. 3 Problems and solutions that need to be paid attention to in use Because the electromagnetic flowmeter has the above characteristics. when using it. There are some issues that require special attention. (1) The liquid should have the conductivity required for the measurement. And the conductivity distribution is required to be substantially uniform. Therefore, the installation of the flow transmitter should avoid places that are prone to uneven conductivity, such as adding liquid near its upstream, and the liquid addition point is best located downstream of the transmitter. (2) The measuring tube of the transmitter must be filled with liquid (except for the non-full tube type). The transmitter should be installed in a place where the measuring conduit can be filled with liquid at all times to prevent the illusion that the pointer is not at zero due to no liquid in the measuring conduit. The measuring tube is preferably installed vertically so that the liquid to be measured flows through the meter from bottom to top. In this way, measurement errors caused by deposits in the conduit or air bubbles in the medium can be avoided. If it cannot be installed vertically, it can also be installed horizontally. But make the two electrodes on the same level. (3) The signal of the electromagnetic flowmeter is relatively weak, only 2.5 ~ 8mV at the full scale, the flow rate is very small, the output is only a few microvolts, and a slight external interference can affect the measurement accuracy.
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