Constraints Encountered in the Application of Ultrasonic Flowmeters

The constraints encountered in the application of ultrasonic flowmeters are mainly that the temperature range of the measurable fluid is limited by the temperature resistance of the ultrasonic transducer aluminum and the coupling material between the transducer and the pipeline, and the original sound transmission velocity of the measured fluid at high temperatures. Incomplete data. At present, our country can only be used to measure fluids below 200 °C. In addition, the measurement circuit of the ultrasonic flowmeter is more complicated than that of the ordinary flowmeter. This is because, in general, the flow velocity of liquid in industrial metering is often several meters per second, and the propagation velocity of sound waves in liquid is about 1500m/s, and the change of the measured fluid flow velocity (flow rate) brings the maximum change in sound velocity is also 10- 3 orders of magnitude. If the accuracy of measuring the flow velocity is required to be 1%, the accuracy of the measurement of the velocity of sound needs to be on the order of 10-5 to 10-6, so it must have a complete measurement circuit to complete, which is why the ultrasonic flowmeter is only in the integrated circuit The reason why the ability can be practically used under the premise of the rapid development of technology.

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