Inspection and debugging of electromagnetic flow meter, and application advantages

Abstract: The inspection and debugging of electromagnetic flowmeters, as well as information on application advantages are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Electromagnetic flowmeter is the most suitable instrument for measuring various conductive liquids in conduits using the law of electric ink induction. The transmitter has a simple structure with no protruding or rotating parts in the tube. Therefore, it is suitable for all kinds of corrosive such as acid, alkali, salt solution and solid suspension. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the inspection and debugging of electromagnetic flowmeters, and the details of the application advantages article. Electromagnetic flowmeter is the most suitable instrument for measuring various conductive liquids in conduits using the law of electric ink induction. The transmitter has a simple structure with no protruding or rotating parts in the tube. Therefore, it is suitable for various corrosive liquids such as acid, alkali, salt solution and solid suspension. But it cannot be used for the measurement of gasoline or other mixed liquids. (1) Zero point inspection and adjustment Before the instrument is put into operation, the zero point must be adjusted when the electromagnetic flowmeter sensor is filled with liquid after power-on. After being put into operation, it is also necessary to periodically stop the flow for zero-point inspection under the conditions of night use; especially for precipitation, easily polluted electrodes, and non-cleaning liquids containing solid phase, more inspections should be carried out in the early stage of operation to obtain experience to determine the normal inspection cycle. Compared with the rectangular wave shock, the electromagnetic flowmeter of the AC excitation method is more prone to zero drift, so more attention should be paid to inspection and adjustment. Give two examples of application errors where the deposited layers fail. First, in oil drilling and cementing engineering, the total flow of cement slurry is an important process parameter, and high-pressure electromagnetic flowmeters are often used. The instrument is used intermittently. After use, rinse the sensor measuring tube with clean water, and the remaining time is empty. Due to the incomplete cleaning, the residual cement slurry on the inner wall of the measuring tube solidified into a thin layer, which accumulated to form an insulating layer in the past two months, covering the entire electrode surface, resulting in abnormal operation and eventually unable to work. The other is the electrolytic cutting process test device. The electromagnetic flowmeter is used to control the flow of saturated brine. After a period of intermittent use, it is found that the flow signal gradually weakens, and the signal becomes zero after 2 months. The reason is that iron oxide deposits on the tube wall during the electrolytic cutting process, resulting in a short circuit. Clear the stratification and return to normal immediately. (2) Regularly check the electrical performance of the sensor 1) Roughly measure the resistance between the electrodes. Disconnect the signal connection between the sensor and the converter. The sensor is filled with liquid. Use a multimeter to measure the resistance between the two electrodes and the grounding terminal. Whether the electromagnetic water meter is specified in the manufacturer values, and the two measured values ​​are approximately the same. Record the resistance value of the first measurement, which is useful for later determining the cause of the sensor failure (such as whether the deposited layer is conductive or insulating). 2) Check the electrode insulation resistance sensor. Empty the liquid, wipe the inner wall, and use a megohmmeter to measure the resistance between the two electrodes and the ground terminal after it is completely dry. 3) Check the insulation resistance of the excitation coil Remove the wiring between the sensor excitation coil terminal and the converter, and measure the insulation resistance of the coil with a megohmmeter. Advantages: 1. The electromagnetic flowmeter has no mechanical inertia and has a sensitive response. It can measure the instantaneous pulsating flow, and can also measure the flow in both positive and negative directions. 2. The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the flow state (laminar flow or turbulent flow) under symmetrical distribution. Therefore, the range of the electromagnetic flowmeter is extremely wide, and its measurement range can reach 100:1, and some even reach the operational flow range of 1000:1. 3. The sensor structure of the electromagnetic flowmeter is simple, and there are no moving parts in the measuring tube, nor any throttling parts that hinder the flow of the fluid. Therefore, when the fluid passes through the flow meter, it will not cause any additional pressure loss, and it is one of the flow meters with the lowest operating energy consumption among the flow meters. 4. The caliber range of industrial electromagnetic flowmeters is extremely wide, from a few millimeters to several meters, and there are real-flow calibration equipment with a diameter of 3m in China, which lays the foundation for the application and development of electromagnetic flowmeters. 5. Electromagnetic flowmeter is a volume flow measuring instrument. During the measurement process, it is not affected by the temperature, viscosity, density and conductivity of the measured medium (within a certain range). Therefore, the electromagnetic flowmeter can be used to measure the flow of other conductive liquids only after being calibrated by water. 6. It can measure the flow rate of dirty medium, corrosive medium and suspended liquid-solid two-phase flow. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Inspection and debugging of electromagnetic flow meter, and application advantages'
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