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When selecting a turbine flowmeter, it is necessary to first ensure that it meets the actual requirements of the fluid medium under the operating conditions; its measurement range must satisfy the requirements for accurate measurement； When measuring low-pressure gases, it is necessary to ensure the stability, reliability, and accuracy of the measurements, while simultaneously minimizing the pressure loss caused by the instrument itself and reducing energy consumption ； For dirty media with high viscosity, it is advisable to choose flow measurement instruments that are less prone to clogging and easy to clean ； When measuring the same fluid medium, it is advisable to use the same flow meter whenever possible, so that the measurement data obtained are comparable ； For flow meters, it is preferable to choose those with low requirements regarding straight pipe sections, stable and reliable performance, and easy installation ； When selecting flow meters, the subsequent maintenance costs should also be taken into account; efforts should be made to minimize maintenance needs in order to avoid production disruptions caused by failures in the flow measurement devices. An ultrasonic flow meter is a device that measures flow rate by detecting the effect of fluid flow on ultrasonic pulses. Based on the method of signal detection, they can be classified into the propagation speed method (time difference method, phase difference method, frequency difference method), Doppler method, cross-correlation method, etc.