The key technological measures for the manufacture of electromagnetic flow meter sensors to improve the manufacturing level of electromagnetic flow meters

Abstract: The key process measures for the manufacture of electromagnetic flow meter sensors and the information to improve the manufacturing level of electromagnetic flow meters are provided by excellent flow meter and flow meter manufacturers. Electromagnetic flowmeter processing method and the effect of electrode tetrafluoro lining on fluid noise Abstract Improving the processing roughness level of electromagnetic flowmeter lining and electrode not only improves the appearance and performance of the product, but more importantly, reduces the fluid noise substantially . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the key process measures for the manufacture of electromagnetic flowmeter sensors to improve the manufacturing level of electromagnetic flowmeters. The details of the article. Electromagnetic flowmeter processing method and the effect of electrode tetrafluoro lining on fluid noise Abstract Improving the processing roughness level of electromagnetic flowmeter lining and electrode not only improves the appearance and performance of the product, but more importantly, reduces the fluid noise substantially The probability and magnitude of the generation, thereby improving the sensitivity and stability of the flowmeter measurement. From the classification and generation of fluid noise at dynamic zero point of electromagnetic flowmeter caused by sensor lining and electrode roughness, this paper leads to important measures to reduce fluid noise and improve signal-to-noise ratio. Then introduce some key technological measures in the manufacture of electromagnetic flowmeter sensors, hoping to play a certain role in improving the manufacturing level and product competitiveness of electromagnetic flowmeters in my country. Keywords fluid noise, polarization voltage, electrode passivation film Introduction In electromagnetic flowmeter measurement, the electrochemical reaction of electrolyte fluid to metal electrodes will generate DC polarization voltage. This flow-independent voltage is called fluid noise. From Faraday's first failure to measure the speed of the Thames using the geomagnetic field and electromagnetic induction methods in 1832, to the widespread application of electromagnetic flowmeters to measure the flow of conductive liquids, fluid noise has always been one of the important technical problems to be solved by electromagnetic flowmeters. Especially since entering the era of low frequency rectangular wave excitation, the influence of fluid noise has become more prominent. Often some newly assembled flowmeters are affected by electrode polarization, and the output swing needs to be immersed in water for a long time to eliminate. The size of the fluid noise directly affects the sensitivity, linearity and stability of the flowmeter measurement. Therefore, study fluid noise, explore its causes, find out methods to reduce fluid noise, and improve sensor signal-to-noise ratio, especially for the development of weak excitation current (electromagnetic water meter, two-wire electromagnetic flowmeter) and low flow rate (0.1 The expansion of the flow measurement range at high flow velocity (above 15m/s) is of great significance. 1. Fluid noise In addition to the noise generated by the surrounding environmental conditions, electromagnetic field, electrostatic field and other factors in the application of electromagnetic flowmeter, the fluid noise of the measured medium is also a very important factor. Fluid noise is a DC polarized voltage, which is especially prominent in the low-frequency rectangular wave excitation method, often including: slurry noise, flow noise and high-end velocity noise. The causes of fluid noise are as follows: (1) The corrosion resistance of stainless steel electrodes is that they have a very thin passivation layer on their surface, which makes the electrochemical reaction reach equilibrium. As shown in Figure 1, the solid objects in the fluid hit the electrode, so that the passivation layer on the surface of the electrode is destroyed, and the electrochemical balance is lost. The metal material in contact with the fluid medium has the ability to restore the surface passivation layer to maintain the electrochemical balance. During the point chemical equilibrium, the free ions in the metal and the fluid continuously undergo electrochemical reactions under the action of the signal electric field. The solid particles hit the electrodes and continuously destroy the protective passivation layer; the electrochemical reaction repeatedly generates the passivation layer, so the potential between the electrodes is continuously and greatly changed, and this changing potential causes fluid noise in the flow signal. This situation is also known as slurry noise in electromagnetic flowmeters. Theory and practice show that the increase of the frequency that affects the change of the electric field of the electrochemical reaction signal can rapidly decrease the fluid noise amplitude, which is why high-frequency excitation and dual-frequency excitation can solve the measurement of slurry. (2) Fluid friction lining and electrodes, the positive and negative ions generated in the fluid are separated from the electrolyte fluid. The rougher the lining and electrode surface, the higher the free ion concentration.

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