Advantages and disadvantages of ultrasonic flowmeter1

The advantages of ultrasonic flowmeter are: 1. Ultrasonic flowmeter is a non-contact measuring instrument, which can be used to measure fluid flow and large pipe diameter flow that are not easy to touch and observe. It does not change the flow state of the fluid, produces no pressure loss, and is easy to install. 2. It can measure the flow of strong corrosive medium and non-conductive medium. 3. The ultrasonic flowmeter has a large measurement range, and the pipe diameter ranges from 20mm to 5m. 4) The ultrasonic flowmeter can measure the flow of various liquids and sewage. 4. The volume flow measured by the ultrasonic flowmeter is not affected by the temperature, pressure, viscosity and density of the measured fluid and other thermal and physical parameters. It can be made into fixed and portable forms. The disadvantages of the ultrasonic flowmeter are: 1. The temperature measurement range of the ultrasonic flowmeter is not high, and generally it can only measure fluids with a temperature lower than 200°C. 2. Poor anti-interference ability. It is susceptible to interference from bubbles, scale, ultrasonic noise mixed in by pumps and other sound sources, affecting measurement accuracy. 3. The straight pipe section has strict requirements, 20D in the front and 5D in the back. Otherwise, the dispersion is poor and the measurement accuracy is low. 4. The uncertainty of the installation will bring large errors to the flow measurement. 5. Scaling of the measurement pipeline will seriously affect the measurement accuracy and cause significant measurement errors, and even in severe cases, the instrument will have no flow display. 6. The reliability and accuracy grades are not high (generally about 1.5 to 2.5 grades), and the repeatability is poor. 7. The ultrasonic flowmeter determines the volume flow by measuring the fluid velocity. For the liquid, its mass flow should be measured. The mass flow measured by the instrument is obtained by multiplying the volume flow by the artificially set density. When the fluid temperature changes, the fluid The density is changing, artificially setting the density value cannot guarantee the accuracy of the mass flow rate. Only by measuring the fluid velocity and fluid density at the same time, can the real mass flow value be obtained through calculation.

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