What’s the working principle of clamp-on ultrasonic flowmeter?

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KFMH Clamp-on ultrasonic flowmeter has the advantages of high accuracy and high reliability, and can be widely used in flow monitoring in chemical industry, metallurgy, water treatment, energy and other fields. Its working principle is simple and easy to understand, which is described in detail below.

  1. Principle of sound wave propagation

Sound wave propagation is based on the wave theory, that is, the vibration in matter can produce waves. Sound wave is a mechanical wave generated by the vibration of air molecules. It has a fast transmission speed and can spread in air, liquid and solid.

  1. Ultrasonic propagation in fluid

Due to the different propagation speed of ultrasonic wave in different medium, reflection, refraction and other phenomena will occur when it propagates between media. When ultrasonic wave propagates into the fluid, it will be affected by the flow velocity in the fluid. The faster the flow velocity, the faster the ultrasonic wave propagates in the fluid; The slower the flow rate, the slower the ultrasonic propagation speed in the fluid.

  1. Working principle of ultrasonic flowmeter

The external ultrasonic flowmeter is mainly composed of ultrasonic transmitter and receiver, flow channel and calculation unit.

3.1. Transmitter and receiver send out sound waves

The ultrasonic transmitter sends out ultrasonic wave to the fluid and propagates to the ultrasonic receiver through the flow channel, and the receiver receives the ultrasonic signal.

3.2. Fluid affects ultrasonic propagation speed

The propagation time of ultrasonic signal in the fluid with slower flow rate is longer than that in the fluid with faster flow rate.

3.3. Calculated flow

The calculation unit will use the difference of ultrasonic propagation time to calculate the flow rate of the fluid, and then combine with the cross-sectional area of the channel to calculate the flow.



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