The gas ultrasonic flowmeter is an intelligent flow measurement instrument that measures the volume flow / mass flow of gas based on the ultrasonic propagation principle. It belongs to a non - contact flow measurement device. The core principle is to calculate the gas flow velocity and flow rate by using the time difference / phase difference / frequency difference of ultrasonic waves propagating downstream and upstream in the gas medium. It is widely used in the measurement scenarios of various gases such as natural gas, coal - derived gas, and industrial gases.

The liquid ultrasonic flowmeter is a non - contact measuring instrument that measures the volume / mass flow of liquids based on the propagation characteristics of ultrasonic waves. Its core principle is to calculate the liquid flow velocity and flow rate by using the time difference / frequency difference of ultrasonic waves propagating downstream and upstream in the liquid medium. It is suitable for measuring most single - phase clean liquids such as water, oils, and chemical solvents. It is a mainstream flow - measuring device in fields like water supply and drainage, petrochemical industry, metallurgy and power, and municipal water conservancy. Compared with traditional liquid flowmeters (such as turbine, electromagnetic, and orifice plate flowmeters), it has significant advantages of non - contact, no pressure loss, and suitability for large - diameter pipelines.