The solution to the unstable zero point of electromagnetic flow meter

Abstract: The information on the solution to the instability of the zero point of the electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Electromagnetic flowmeter is one of the most commonly used flowmeters in industrial measurement today. Because the electromagnetic flowmeter has the ability to measure not affected by changes in fluid density, viscosity, temperature, pressure and conductivity, the converter adopts a novel excitation method, which has low power consumption, Zero is stable. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the solution to the unstable zero point of the electromagnetic flowmeter. Electromagnetic flowmeter is one of the most commonly used flowmeters in industrial measurement today. Because the electromagnetic flowmeter has the ability to measure not affected by changes in fluid density, viscosity, temperature, pressure and conductivity, the converter adopts a novel excitation method, which has low power consumption, The zero point is stable and accurate. The flow scale can reach 150:1, etc., but if it is used too much, there will be problems. So today, I will analyze the five inspection and cleaning methods for the unstable zero point of the electromagnetic flowmeter. 1. First sweep and check: Check the program to check the unstable flow of the zero-point electromagnetic flowmeter. First, start the investigation and judgment according to the whole process, and then check and try to eliminate the faults item by item. Yes: (1) It can be understood through investigation or inquiries that there is no need for major operations in the front, that is, easy first and then difficult; (2) According to the past on-site maintenance experience, the frequency of occurrence is higher, and the probability of occurrence may be higher in the future. (3) Check your own needs. If you start to investigate and confirm the causes of several faults, you can also check in detail in advance. 2. The electromagnetic flowmeter sensor is not perfect and is affected by stray current and other external factors. Disturbance: External disturbances such as pipeline stray current affect the good grounding maintenance of the main electromagnetic flowmeter. Generally, the grounding resistance is required to be less than 1000. Do not share the grounding with other motors and electrical appliances. Sometimes the environmental conditions are better, and the electromagnetic flowmeter can be normal if it is not grounded. However, once the good environment does not exist, the appearance will appear faulty, and it will be troublesome to check again at that time. Changes in the status of electrical equipment adjacent to the flow sensor (such as increased leakage current) constitute changes according to the ground potential, and the electricity will cause The zero point of the electromagnetic flowmeter changes. 3. The reasons for the liquid of the electromagnetic flowmeter (such as the uniformity of liquid conductivity, electrode pollution, etc.); the change or unevenness of the liquid conductivity will change the zero point when it is stationary, and make the output shake when flowing Therefore, the flowmeter should be positioned away from the point where the liquid is written or downstream of the chemical reaction section of the pipeline, and the flow sensor is best installed upstream of these places. If the liquid contains solid phase, or impurities accumulate on the inner wall of the measurement tube, or scale on the inner wall of the measurement tube , or the electrode is polluted by grease, etc., there may be zero changes. Because the scale of the inner wall surface and the degree of contamination of the electrode may not be completely the same and symmetrical, the balance state of the initial setting of the factory will be damaged. Active measures are sufficient to eliminate contamination and Accumulation of scale layer; if the zero change is not large, you can also try to reset the zero from scratch. Fourth, the signal circuit insulation of the electromagnetic flowmeter is reduced. The reduction of the signal circuit insulation will cause the zero point instability. The main reason for the reduction of the signal circuit insulation is that the pole position It is caused by the reduction of insulation, but it cannot be eliminated from the insulation reduction or damage of the signal cable and its terminals. Because sometimes the site environment is very strict, the outer cover/conductor joint is neglected and the sealing is not careful, and it is filled with moisture, acid mist or powder particles. Dust penetrates into the external junction box or cable protection layer, causing the insulation to drop. The insulation resistance of the signal loop is checked separately on the cable side and the flow sensor side, and tested with a megohmmeter. Because the signal cable is simple, it can be done first. The flow sensor is then It is carried out in two steps: measuring the touch resistance of the electrode surface after filling the liquid and measuring the insulation resistance of the U pole. 5. Checking the touch resistance of the electrode and the insulation resistance of the electrode is carried out in two steps. Remove the signal cable from the resistance flow sensor, and use a multimeter to measure the resistance between each electrode and the connection address. The left of the two electrodes should be 10%-20%. The measurement' will be further explained. (2) Empty tube measurement electrode insulation vent the measurement tube, wipe the inside and outside with a dry cloth, and wait until it is completely dry Then, measure the resistances between each electrode and the ground with a H500VDC megger, the resistance must be within 100MΩThe above. The above are the inspection methods of the five cleaning methods of the electromagnetic flowmeter. When encountering a problem or after-sales, you can also test your own skills to check and correct them, which can effectively improve the work efficiency. Questions about the flowmeter look forward to consultation. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Solution to the Instability of Zero Point of Electromagnetic Flow Meter'
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