Causes of Fluid Noise in Electromagnetic Flow Meters

Abstract: The information on the causes of fluid noise generated by electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Study fluid noise of electromagnetic flowmeter, discuss its causes, find out methods to reduce fluid noise, 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 ( 0.1m/s or less). More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the causes of fluid noise generated by electromagnetic flowmeters. Study fluid noise of electromagnetic flowmeter, discuss its causes, find out methods to reduce fluid noise, 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 ( 0.1m/s or less) and high flow velocity (above 15m/s) flow measurement range expansion is of great significance. The causes of fluid noise are as follows: 1. 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. Under the action of the electric field of the electrode signal, a part of the ions will move to the electrode to form a noise voltage, which is called flow noise. Flow noise is more prominent in low conductivity measurements. The flow noise is related to the strength of the external electric field. The larger the induction signal at high flow rate, the larger the noise amplitude, and the output will be very unstable. 2. Rapid changes in fluid conductivity and pH value will also cause flow noise, and the measurement instability of the upstream dosing performance of the flowmeter is a typical example. The reason is that when different media are mixed unevenly, positive and negative ions are easily separated in the fluid. Under the action of the electrode signal electric field, some ions will move to the electrode, forming a flow noise voltage, resulting in unstable output. 3. Since the thickness of the laminar boundary layer of the high-velocity flowing fluid near the lining and the electrode becomes very thin, the roughness height of the lining and the electrode breaks through the thickness of the laminar boundary layer of the flow velocity. The fluid hits this part of the roughness height, and the flow velocity occurs. Divergence and mutation. There is a part of the flow velocity component in the same (or opposite) direction as the central axis of the measuring tube, which is affected by the signal weight function and has a great influence on the electrode signal, resulting in a large positive error, which is the high-end flow velocity noise. The flow noise and high-end flow velocity noise in the above-mentioned fluid noise are directly related to the lining of the measuring tube and the surface roughness of the electrode, and the slurry noise generated by the polarization voltage is also closely related to the surface roughness of the electrode. Electromagnetic flowmeter, a domestic high-end flowmeter brand, takes customer demand as the first priority, and puts quality first, so that customers can use it with confidence. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'The Causes of Fluid Noise from Electromagnetic Flow Meters'

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