Currently, my country's total flow measurement technology is developing rapidly, and various high-performance flow meters have been widely used in industrial production. Different flow meters have varying performance indicators and application areas, while ultrasonic flow meters, thanks to their versatility, are suitable for a variety of applications and cover multiple fields, including agriculture and wastewater treatment.
Clamp-on or inline ultrasonic flow meters are based on the "velocity difference method" principle and are used to measure liquid flow in circular pipes. They utilize advanced multi-pulse technology, intelligent signal processing technology, and error correction technology, making them more adaptable to industrial environments and providing more convenient, economical, and accurate measurement. The products have reached internationally advanced levels and can be applied in industries such as petroleum, chemical, metallurgy, power, and drainage.
Applications of Ultrasonic Flow Meters
Ultrasonic flow meters are non-contact instruments that can measure the flow of large-diameter media and are also suitable for measuring media that are difficult to access or observe. They offer high measurement accuracy and are virtually unaffected by various parameters of the measured medium. They are particularly effective in solving flow measurement problems for highly corrosive, non-conductive, radioactive, and flammable/explosive media that are difficult to measure with other instruments.
1. Principle of Ultrasonic Flow Meters
During fluid propagation, the speed of ultrasonic pulses is closely related to the fluid velocity: the speed increases in the downstream direction and decreases in the upstream direction, resulting in a significant difference in propagation time, and the flow rate increases with the increase in the time difference. In practical operation, two sensors, one upstream and one downstream, respectively emit ultrasonic pulses. Due to the fluid flow, there will be a difference in the time it takes for the two pulses to reach the ultrasonic transducer. Since the propagation path is the same, the time difference directly reflects the actual fluid flow rate. When using the time difference method for measurement, two sensors are required for signal transmission and reception. When installed in a pipe, the sensors communicate via acoustic signals, alternately transmitting and receiving signals during operation. If the fluid in the pipe is stationary, the propagation time in the downstream and upstream directions is the same; if the fluid is flowing, the propagation time of the downstream signal is shorter than that of the upstream signal. In this case, the time difference between the downstream and upstream propagation times is directly proportional to the actual flow rate.
2. Characteristics of Ultrasonic Flowmeters
Ultrasonic flowmeters do not require contact with the medium, and there are no obstructions inside the pipe, thus avoiding any interference with fluid flow and preventing pressure loss. They can be effectively used with various media, especially for flow measurement of high-viscosity and highly corrosive media. Furthermore, ultrasonic flowmeters can effectively handle gas pressure and exhibit excellent performance characteristics in small-diameter flow measurement.
