Five steps of electromagnetic flow meter to solve zero instability phenomenon

Abstract: Five steps for electromagnetic flow meter to solve the phenomenon of zero point instability. The analysis information is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Five steps of intelligent electromagnetic flowmeter to solve the phenomenon of zero point instability Analysis of the situation that the electromagnetic flowmeter is often unstable in zeroing in industrial production, there are many reasons for this problem, according to the technical staff of Mingyu automatic control equipment for many years. experience,. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the five steps of electromagnetic flowmeters to solve the zero-point instability analysis article details. Five steps of intelligent electromagnetic flowmeter to solve the phenomenon of zero point instability Analysis of the situation that the electromagnetic flowmeter is often unstable in zeroing in industrial production, there are many reasons for this problem, according to the technical staff of Mingyu automatic control equipment for many years. According to experience, there are mainly the following factors: 1. The pipeline is not filled with liquid or the liquid contains air bubbles. It is objectively considered that there is no activity in the flow sensor, but there is actually a small amount of activity. 2. If the valve is used for a long time or the liquid is dirty, the valve will not be fully sealed, which will also lead to the occurrence of zero-point instability. 3. The liquid conductivity varies or is uneven, which will cause the zero point to change when it is still, and the output will shake when it is active. 4. Due to the fact that the scale on the inner wall and the outer surface of the electrode and the contamination level of the electrode cannot be completely the same and symmetrical, the equilibrium of the initial zero adjustment setting is destroyed. 5. Changes in the state of the power equipment near the flow sensor (such as increased leakage current) cause changes in ground potential, which will also cause changes in the zero point of the intelligent electromagnetic flowmeter. Through the analysis of the problem, we can find the corresponding solution according to the corresponding phenomenon. Electromagnetic flowmeter zero-point drift control-first elimination inspection: the inspection procedure checks the unstable process of the zero-point intelligent electromagnetic flowmeter. First, make a preliminary investigation and judgment according to the overall consideration of the process, and then carefully check and try to troubleshoot one by one. The inspections listed in the process The principle of the sequence of items and ports is: (1) It can be observed or inquired that the ones that do not require major operations are first, that is, the easy first and then the difficult; (2) According to the past on-site maintenance experience, the frequency of occurrence is high and the probability of occurrence may occur in the future. The higher one is first; (3) The sequence requirements required by the inspection itself. If the cause of the failure of the team is confirmed through preliminary investigation, detailed inspection can be made in advance. External interference such as stray current: External interference such as pipeline stray current affects the good grounding protection of the main electromagnetic flowmeter. Generally, the grounding resistance is required to be less than 1000, and the grounding should not be shared with other motors and electrical appliances. Sometimes the environmental conditions are better, and the intelligent electromagnetic flowmeter It can work normally without grounding, but once a good environment does not exist, the instrument will fail, and re-checking at that time will bring more troubles. Electricity will cause the zero point of the intelligent electromagnetic flowmeter to change. 3. Reasons for the liquid of the intelligent electromagnetic flowmeter (such as the uniformity of liquid conductivity, electrode pollution, etc.); The change or unevenness of the liquid conductivity will cause the zero point to change when it is stationary. The output will shake when flowing. Therefore, the flow meter should be located far away from the injection point or the downstream of the chemical reaction section of the pipeline, and the flow sensor should be installed upstream of these places. If the liquid contains solid phase, or impurities deposit on the inner wall of the measuring tube, or in the measuring tube If the wall is fouled, or the electrode is polluted by grease, etc., zero-point fluctuations may occur. Because the scale on the inner wall surface and the degree of contamination of the electrode cannot be exactly the same and symmetrical, it will destroy the balance of the initial set-up of the factory. Active measures are sufficient Remove the dirt and deposited scale layer; if the zero change is small, you can try to re-zero. 4. The insulation of the signal circuit of the electromagnetic flowmeter decreases. The decrease of the insulation of the signal circuit will cause the zero point instability. The main reasons for the decrease of the insulation of the signal circuit are sufficient. Drop or damage. Because sometimes the on-site environment is very harsh, a slight negligence in the sealing of the instrument cover/conductor connection is filled with moisture, acid mist or powder dust intrusion into the instrument junction box or cable protective layer, causing the insulation to fall. Signal circuit The insulation resistance inspection is carried out separately on the cable side and the flow sensor side, and is tested with a megohmmeter. It can be done first because the signal cable is easy to do. Measurement, U-pole insulation resistance. 5. Check the electrode contact resistance and electrode insulation resistance in 2 steps. (1) Fill the liquid to measure the liquid contact resistance flow sensor on the surface of the electrode, remove the signal cable wiring, and use a multimeter to measure each electrode and the connection respectively. Location, resistance between the two electrodes to the ground should be within 10%-20%. In the ninth section"1/ Measurement of electrode contact resistance"There will be further instructions. (2) Empty tube measuring electrode insulation Empty the measuring tube, wipe the inner surface with a dry cloth, and after it is completely dry, measure the resistance between each electrode and the ground with a H500VDC megger, and the resistance value must be within 100MΩAbove. Under normal circumstances, through the inspection and operation of the above five steps, the situation of zero point instability can be basically solved. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of Five Steps to Solve Zero Instability of Electromagnetic Flow Meter'

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