Ultrasonic flowmeter|ultrasonic flowmeter

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1. What is the basic principle of ultrasonic flowmeter and what are the characteristics of ultrasonic flowmeter? Ultrasonic flowmeter is used to measure flow by detecting the rough imitation of the ultrasonic beam by the fluid. Its non-contact and wide applicability are the core advantages. The working principle of ultrasonic flowmeter mainly depends on two physical effects. The time difference method calculates the flow velocity by measuring the time difference between the propagation of ultrasonic waves in the bending direction of the upstream and downstream rocks. The speed of sound increases when flowing downstream and decreases when flowing upstream, and this time difference is proportional to the fluid velocity. The Doppler law utilizes the Doppler effect. When ultrasound encounters suspended particles or bubbles in a fluid, the frequency of the scattered wave will shift. The flow velocity can be calculated by measuring the frequency difference between the emitted wave and the scattered wave. 2. Main features and advantages: Non contact measurement: using an external clamp sensor, there is no need to cut the pipeline during installation, no interference with the flow state, no pressure loss, especially suitable for large pipe diameters and corrosive and hazardous fluids. Wide measurement range: The flow velocity measurement range can usually reach 0.01 to 12m/s, which can adapt to various flow scenarios from extremely low to high speeds. High accuracy: Under ideal conditions, its measurement accuracy can reach ± 0.5% to ± 2%. Widely applicable to fluids: can measure various liquids and gases such as water, sewage, petroleum, chemicals, air, etc. Disadvantages: • Influenced by fluid characteristics: The temperature, pressure, and composition of the fluid (such as gas content or solid particle concentration) can significantly affect the propagation of ultrasonic waves, which may introduce measurement errors. High installation requirements: The installation position, spacing, and coupling agent application of the external clamp sensor are crucial to the measurement results, and improper installation can lead to a decrease in accuracy. • Relatively high cost: Its initial investment is usually higher than some conventional mechanical flow meters.

2. What is the maximum ultrasonic flow rate?

The actual flow limit of the maximum ultrasonic flowmeter depends on the pipe diameter size. Currently, the maximum nominal pipe diameter of industrial grade products can reach 6000mm, and the theoretical instantaneous flow rate can reach hundreds of thousands of cubic meters per hour when the pipe is full.

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