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The commonly used ultrasonic flowmeters mainly include portable ultrasonic flowmeters, handheld ultrasonic flowmeters, and fixed ultrasonic flowmeters. (1) Portable ultrasonic flowmeters use a non-contact measurement method, are small in size, and easy to carry. Field measurement of sound-conducting media for pipes of various sizes. Measurement media include water, industrial wastewater, acids and alkalis, various oils, and other liquids that can conduct sound waves. The flow rate range is (0～±30) m/s, with a precision better than 1%. (2) This utility model is small in size, light in weight, easy to carry, flexible to operate, features automatic data storage, and offers full Chinese display. The measuring media include uniform, homogeneous, and stable liquids such as water, seawater, industrial wastewater, alcohol, acid-reducing agents, and various oils. The flow rate range is (0.01±32) m/s, with a precision better than 1%. (3) The fixed-type ultrasonic flow meter features a compact and robust design, utilizing an internationally advanced die-cast aluminum casing. The measuring media include water, seawater, industrial wastewater, acids and alkalis, various oils, and other liquids that can conduct sound waves. The flow rate range is (0～±30) m/s, with a measurement accuracy better than 1%. The circulating water in the production systems of biochemical enterprises contains small amounts of impurities. Taking all factors into account, the flow rate of the circulating water in the pipeline should be measured using a portable ultrasonic flow meter.