Application of Insertion Electromagnetic Flow Meter in Mine Water Treatment

Abstract: The application information of plug-in electromagnetic flowmeter in mine water treatment is provided by excellent flowmeter and flowmeter production and quotation manufacturers. Application of Insertion Electromagnetic Flowmeter in Mine Water Treatment In order to reduce pollution, save water and reduce emissions, it is necessary to strictly measure and control domestic water, industrial water, circulating water and discharged sewage. The measurement of flow is carried out in total control of water resources. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the application article details of the plug-in electromagnetic flowmeter in mine water treatment. Application of plug-in electromagnetic flowmeter in mine water treatment In order to reduce pollution, save water and reduce emissions, it is necessary to strictly measure and control domestic water, industrial water, circulating water and discharged sewage. The measurement of flow plays an important role in the total control of water resources, quota management and petrochemical production and process control. 1 Technical analysis 1.1 Working principle The working principle of the plug-in electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. When measuring the flow, the liquid flows through a magnetic field perpendicular to the flow direction, and a voltage proportional to the average flow rate (volume flow) is induced. The induced voltage signal is detected by two electrodes in direct contact with the liquid, and transmitted to the smart transmitter through a special cable. The flow rate standard 4～20MA, 1～5VDC signal is output to the flow secondary instrument or DCS. 1.2 Composition The plug-in electromagnetic flowmeter is mainly composed of sensors, intelligent transmitters and special cables. (1) The sensor is composed of an electrode and an excitation coil. Its function is to generate a corresponding induced potential (5-60mV) on the electrode according to the speed of the conductive medium (fluid) flowing through the excitation coil. (2) The function of the smart transmitter is to amplify the induced potential signal of the sensor, and then calculate according to the mathematical model and formula of the potential flow to obtain the flow result and the standard flow signal. The adjustment of various flow parameters and the setting of calibration parameters are carried out on the intelligent transmitter. (3) The function of the special communication cable is that the sensor transmits the millivolt potential signal to the smart transmitter, and the smart transmitter provides the oscillating voltage to the excitation coil. Since the potential signal is a weak signal of 5-60mV, and the excitation signal is an oscillating signal of high frequency and low amplitude, the shielding and anti-interference properties of the cable should be fully considered. The length of the cable is proportional to the cross-sectional area, and proportional to the conductance of the medium. The stronger the conductivity, the longer the transmission distance. Generally, the transmission distance is 20-500m. 1.3 Installation requirements 1.3.1 Ensure that when the direction, diameter and valve opening of the fluid in the straight pipe section change, eddy current and flow field distortion will be generated, which will affect the measurement of the sensor electrode, thereby affecting the accuracy of the instrument. Therefore, it is necessary to keep a certain distance from the elbow, hand valve, regulating valve and other components as much as possible. In the table, D represents the pipe diameter, and L represents the distance from the sensor to the valve or elbow and other components. 1.3.4 Ensure a good grounding The grounding point of the output signal of the sensor should be electrically connected to the measured medium. When the fluid cuts the magnetic line of force to generate a flow signal, the fluid itself is taken as the zero potential, a positive potential is generated on one electrode, and a negative potential is generated on the other electrode, which changes alternately. Therefore, the midpoint of the input end of the converter (the shielding layer of the signal cable) must be at 0 potential and conduct with the fluid, so as to form a symmetrical input loop. The midpoint of the input end of the converter is in electrical communication with the measured fluid through the ground point of the sensor output signal. Since the output signal of the sensor is very small, only a few millivolts, in order to improve the anti-interference ability of the instrument, the 0 potential in the input loop must be grounded. Since the general metal pipes are connected to the ground, and the flowing medium is electrically connected to the ground through the metal pipes, it is not required that the electromagnetic flowmeter be provided with a separate grounding device, especially the small-diameter electromagnetic flow sensor. If it is a non-metallic pipe, it must be connected to a separate ground wire. 1.3.5 Ensure the correct insertion depth of the sensor. Due to the laminar flow phenomenon of the fluid in the pipeline, the fluid velocity close to the pipe wall is slower, and the fluid velocity close to the center of the pipe is faster. speed. When installing, calculate the wall thickness of the pipe and the length of the flange nozzle, and ensure that the electrode insertion depth of the sensor is at the D/8 position. However, not all plug-in flowmeter sensors are installed in the D/8 position of the pipeline, and a few are installed in the D/2 position of the pipeline. Be sure to carefully study the installation instructions before installation. 2 Conclusion Insertion electromagnetic flowmeter is more suitable for large-diameter pipeline installation.ΦThe plug-in electromagnetic flowmeter is more cost-effective than the flange-type electromagnetic flowmeter in the pipeline above 250mm, and the larger the pipe diameter, the more cost-effective it is. Its most notable feature is that it can be installed under pressure. The thickness of the pipe wall basically has no effect on it, but its installation technology is more complicated. If it is installed improperly, it will cause a large error. Mounting a plug-in electromagnetic flowmeter on top should be an economically viable option. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Application of Insertion Electromagnetic Flow Meter in Mine Water Treatment'
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