How to eliminate the noise of intelligent electromagnetic flow meter?

Abstract: How to eliminate the noise of intelligent electromagnetic flow meter? The information is provided to you by the excellent manufacturers of flowmeters and flowmeters. To solve the noise problem of intelligent electromagnetic flowmeter, the first thing to do is to study fluid noise, explore the factors of its occurrence, find out ways to reduce fluid noise, and improve the signal-to-noise ratio of the sensor, especially for weak excitation currents (electromagnetic water meters, two-wire electromagnetic flowmeters) )of. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is how to eliminate the noise of intelligent electromagnetic flowmeter meters? Article details. To solve the noise problem of intelligent electromagnetic flowmeter, the first thing to do is to study fluid noise, explore the factors of its occurrence, find out ways to reduce fluid noise, and improve the signal-to-noise ratio of the sensor, especially for weak excitation currents (electromagnetic water meters, two-wire electromagnetic flowmeters) The development of ) and the expansion of the flow measurement scale of low flow velocity (below 0.1m/s) and high flow velocity (above 15m/s) are of great significance. Fluid noise In addition to being affected by the surrounding environmental conditions, electromagnetic fields, electrostatic fields and other factors during the use of electromagnetic flowmeters, the fluid noise of the measured medium is also a very important factor. Fluid noise is a DC polarized voltage, especially in the low frequency rectangular wave excitation method, often: slurry noise, motion noise and high-end flow noise. The causes of fluid noise are as follows: 1. The corrosion resistance of the stainless steel electrode is that it has a very thin passivation layer on its surface, which makes the electrochemical reaction reach a balanced state. The solid in the fluid hits the electrode, which damages the passivation layer on the surface of the electrode and loses the electrochemical balance. The contact between the metal material and the fluid medium has the ability to regenerate the surface passivation layer to maintain the electrochemical balance. When reaching the electrochemical equilibrium period, the free ions in the metal and the fluid are constantly undergoing electrochemical reactions under the effect of the signal electric field. The solid particles hit the electrodes and continuously damage the passivation layer for protection; the electrochemical reaction repeatedly generates the passivation layer, so the potential between the electrodes is constantly fluctuating and changing, and this changed potential constitutes the 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 response signal can rapidly reduce the fluctuation of fluid noise, which is the factor that high-frequency excitation and dual-frequency excitation can solve the measurement of slurry. 2. The fluid rubs the fabric and the electrode, and the positive and negative ions generated in the fluid are separated from the electrolyte fluid. The rougher the surface of the fabric and electrode, the higher the free ion concentration. Under the effect of the electric field of the electrode signal, a separate ion will move to the electrode, forming a noise voltage, which is called activity noise. Motion noise is better at low conductivity measurements. The activity noise is related to the strength of the external electric field. The larger the induction signal at high flow rate, the larger the noise fluctuation, and the output will be very unstable. 3. The rapid change of fluid conductivity and pH value will also cause active noise, and the measurement instability of the upstream dosing of the flowmeter is a typical example. The main factor is that when different media are not uniformly mixed, positive and negative ions are easily separated in the fluid, and due to the effect of the electrode signal electric field, a separate ion will move to the electrode, forming an active noise voltage, resulting in unstable output. 4. Due to the fact that the thickness of the laminar boundary layer of the active fluid with high flow rate close to the fabric and the electrode becomes very thin, as shown in Figure 3, the roughness of the fabric and the electrode breaks through the thickness of the laminar boundary layer of the flow velocity, and the fluid hits this layer. With some roughness heights, divergence and sudden changes in flow rate occur. There is some flow velocity weight in the same (or opposite) direction as the central axis of the measuring tube. Due to the effect of the signal weight function, it has a great influence on the electrode signal, resulting in a large positive error, which is the high-end flow velocity noise. It can be seen that the motion noise and high-end flow velocity noise in the above-mentioned fluid noise are directly related to the surface roughness of the fabric of the measuring tube and the electrode, and the slurry noise generated by the polarization voltage is also greatly related to the surface roughness of the electrode. Wanjie Instrument Technology recommends for you: intelligent electromagnetic flowmeter The above is the whole content of this article. You are welcome to inquire about the selection and quotation of flowmeters from our factory. 'How to eliminate the noise of intelligent electromagnetic flow meter? 》
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