The principle of ultrasonic flowmeter

When propagating in a flowing fluid, it carries velocity information. Therefore, by receiving it, the flow velocity of the fluid can be detected and converted into flow rate. According to the detection method, flow meters can be divided into different types such as propagation velocity difference method, Doppler method, beam offset method, noise method, and correlation method. Flow meter is a type of flow meter that has only been applied in the past decade with the rapid development of integrated circuit technology

Non contact instruments are suitable for measuring fluids that are difficult to access and observe, as well as large pipe flow rates. It can be linked with a water level gauge to measure the flow of open water. The use of flow ratio does not require the installation of measuring elements in the fluid, so it does not change the flow state of the fluid, does not generate additional resistance, and the installation and maintenance of the instrument do not affect the operation of the production pipeline, making it an ideal energy-saving flowmeter.

As is well known, industrial flow measurement generally faces difficulties in measuring large pipe diameters and large flow rates. This is because general flow meters bring manufacturing and transportation difficulties as the pipe diameter is measured, resulting in increased cost, energy loss, and installation. These disadvantages can be avoided by flow meters. Because all types of flow meters can be installed outside the pipeline and measure flow in a non-contact manner, the cost of the instrument is basically independent of the size of the measured pipeline diameter. However, other types of flow meters increase in cost significantly with the increase of diameter. Therefore, the larger the diameter of the flow meter, the better its performance compared to other types of flow meters with the same function. Considered a good instrument for measuring large pipe diameter flow, the Doppler flowmeter can measure the flow of two-phase media, making it suitable for measuring dirty flows such as sewers and sewage. In power plants, using portable flow meters to measure large pipe flow rates such as water turbine inlet and turbine circulating water volume is much more convenient than traditional pitot tube flow meters. The flow rate juice can also be used for gas measurement. The applicable range of pipe diameter is from 2cm to 5m, and it can be used for channels ranging from several meters wide open channels and culverts to 500m wide rivers.

In addition, the accuracy of flow measurement of ultrasonic measuring instruments is almost unaffected by parameters such as temperature, pressure, viscosity, and density of the measured fluid. They can also be made into non-contact and portable measuring instruments, which can solve the problem of flow measurement of highly corrosive, non-conductive, radioactive, and flammable and explosive media that are difficult to measure with other types of instruments. In addition, considering the non-contact measurement characteristics, coupled with reasonable electronic circuits, one instrument can adapt to multiple pipe diameter measurements and multiple flow range measurements. The adaptability of flow meters is also incomparable to other instruments. Flow meters have some of the advantages mentioned above, so they are increasingly being valued and developed towards product series and universality. They have now been made into standard, high-temperature, explosion-proof, and wet type instruments with different channels to adapt to flow measurement in different media, different occasions, and different pipeline conditions.