Method of Detecting Vortex Frequency with Compressed Air Flow Meter

Abstract: The information on the method of detecting the vortex frequency of the compressed air flow meter is provided by the excellent flow meter and flow meter manufacturers. Compressed air flowmeters have the advantages that other flowmeters cannot have at the same time, and have developed rapidly since the 1970s. According to relevant data, the proportion of compressed air flowmeters used in Japan, Europe and the United States and other developed countries has increased significantly and has been widely used. . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the method of detecting the vortex frequency of the compressed air flowmeter. Compressed air flowmeters have the advantages that other flowmeters cannot have at the same time, and have developed rapidly since the 1970s. According to relevant data, the proportion of compressed air flowmeters used in Japan, Europe and the United States and other developed countries has increased significantly and has been widely used. In various fields, it will dominate the flow meter in the future, and it is currently the preferred flowmeter in China. There are two main methods for detecting the vortex frequency of the compressed air flowmeter: Method 1: Detecting the change of the flow rate when the vortex occurs, using a thermal element, an ultrasonic beam, etc., the vortex generator can be a solid cylinder, a rectangular column, a triangular column and a T-shaped Composite column. Method 2: Detect the pressure change when the vortex occurs, using strain elements, piezoelectric elements, vibration magnetic sensors, photoelectric elements, elastic elements/capacitance elements, elastic elements/piezoelectric elements, etc. The vortex generators can be hollow cylinders, triangular columns, T-shaped columns and various composite columns. The thermal detection element has high sensitivity and is suitable for lower temperature (<200°C) and lower density gas measurement, but because the thermistor is encapsulated with glass, it is relatively fragile and easily affected by dirt, harmful substances and particles in the fluid, so the measured medium should also be a clean liquid. or gas. Piezoelectric elements are resistant to dirt, so they are widely used, but they are not suitable for measuring low-density, low-velocity gases and occasions with large environmental vibrations. The medium temperature range is -32～110℃. At normal temperature, piezoelectric ceramics are insulating, and the impedance is l0~l00MΩ, but if working at 300°C, the impedance will drop to 1MΩ, even tens of thousands of ohms, the output signal becomes smaller, resulting in the deterioration of the low-frequency characteristics of the measurement system, so it cannot be used in high-temperature media. The vibration resistance of the compressed air flowmeter is strong, but the temperature of the medium cannot be higher than 200°C. If it exceeds this range, the ultrasonic probe will be damaged. The ultrasonic vortex flowmeter cannot be used in the occasions where the measured medium has obvious pulsation, such as the fluid at the outlet of the reciprocating compressor, because it has a high sensitivity to small flow. This article comes from: Steam Flow Meters. . cn natural gas flow meter. . com The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Method of Detecting Vortex Frequency by Compressed Air Flow Meter'

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