Electromagnetic flow meter scale sensor manufacturing key technology measures to improve the level of electromagnetic flow meter scale manufacturing

Abstract: the electromagnetic flow meter scale sensor manufacturing key technology measures to improve the level of electromagnetic flow meter scale manufacturing information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Methods with electrode electromagnetic flowmeter processing lining impact on fluid noise pick to improve the level of electromagnetic flowmeter lining and electrode processing roughness, is not only improved the appearance of the product performance, more important is essentially reduces the noise in fluid. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flow meter scale sensor manufacturing key technology measures to improve the manufacture level of electromagnetic flow meter scale article details. Electromagnetic flowmeter processing method and the electrode ptfe lining effect on fluid noise pick to improve the level of electromagnetic flowmeter lining and electrode processing roughness, is not only improved the appearance of the product performance, more important is essentially reduce the risk of the fluid noise and amplitude, and thus improve the sensitivity and stability of the flowmeter measurement. This article from the lining and electrode roughness cause electromagnetic flowmeter sensor dynamic zero classification, the fluid noise, lead to reduce the flow noise important measures to improve the signal-to-noise ratio. Electromagnetic flowmeter sensor are described and some key technology measures in manufacture, hope to improve the level of electromagnetic flow meter in our country and the product competition ability play a help. Keywords flow noise polarization voltage preface electromagnetic flowmeter measurement electrode passivation membrane, electrolyte fluid to the metal electrode electrochemical reaction can produce dc polarization voltage. This has nothing to do with the velocity of the voltage is called the flow noise. From Faraday magnetic field and electromagnetic induction method for the first time in 1832 to measure velocity of the river Thames to fail, to the widely application of electromagnetic flowmeter measurement of conductive liquid flow rate, fluid noise electromagnetic flowmeter has been one of the important technical problems to solve. Especially in the era of entering the low-frequency rectangular wave excitation, the effects of fluid noise more outstanding. Often, some of the new assembly flow meter to the influence of the electrode polarization, the output swing need after a long soak in the water to eliminate. Fluid directly affects the size of the flowmeter measurement noise sensitivity, linearity and stability. Therefore, the research on fluid noise, this paper discusses the reasons, find out the method of reducing the noise of a fluid, the sensor's signal to noise ratio, especially for weak excitation current ( Electromagnetic water meter, two wire system of electromagnetic flow meter) The development and low flow velocity ( 0. Below 1 m/s) And the high velocity ( More than 15 m/s) The expansion of the flow measurement is of great significance. 1. Fluid noise electromagnetic flowmeter in the application in addition to the surrounding environment condition, the noise impact of electromagnetic field, electrostatic field and other factors, the fluid noise of measured medium is also very important factors. Flow noise is a kind of dc polarization voltage, especially in the low-frequency rectangular wave excitation mode, often: slurry flow noise, noise and high velocity of flow noise. Causes of flow noise has the following several ways: (1) corrosion resistance of stainless steel electrode is on the surface passivation layer has a very thin, the electrochemical reaction equilibrium state. As shown in figure 1, fluid solid impact of electrodes, the electrode surface passivation layer are destroyed, bereft of electrochemical equilibrium. And metal materials in contact with the fluid medium has restored generated surface passivation layer to keep balance of electrochemical power. During a balanced point of chemical, metal and fluid under the action of free ions in the signal of electric field of the electrochemical reaction. Solid particle impact electrode, constantly damage to protect the passivation layer; Electrochemical reaction and generate the passivation layer repeatedly, then formed between the electrode potential significantly change constantly, the change of fluid potential cause traffic signal noise. It is also usually speak of slurry noise in the electromagnetic flow meter. The theory and practice show that the higher signal electric field change the frequency of the electrochemical reaction, can make the fluid noise amplitude drops rapidly, this is the high frequency excitation and double-frequency excitation can solve the cause of the size measurement. Fluid friction lining and electrode, fluid of positive and negative ions from the electrolyte fluid. The lining and the electrode surface is rough, the higher free ion concentration. As shown in figure 2, the electrode signal of the electric field effect, part of the ions will move to the electrode, form the noise voltage, this is called the flow noise. Flow noise when low conductivity measurements appear more prominent. Flow noise is related to the intensity of the electric field, the high velocity when the induction signal, the greater the noise amplitude is, the greater the output will be very unstable. (3) fluid conductivity and pH value of dramatic change will form the flow noise, upstream dosing performance measurement meter instability is a typical example. Reason is the different medium without mixing, fluid, easy to separate the positive and negative ions in the electrode signal of the electric field effect, part of the ions will move to the electrode, formed the flow noise voltage, output instability. (4) due to the high velocity of flow of fluid near the laminar boundary layer thickness of the lining and electrode becomes very thin, as shown in figure 3, the lining and electrode roughness height broke through the thickness of the laminar boundary layer flow velocity, and fluid hit this part of the roughness height, velocity divergence and mutation. Some of the same as the measuring tube center axis ( Or the opposite) Velocity component, the signal of the weighting function, the electrode signal has a great influence, formed a large positive error, this is the high velocity of flow noise.

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