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Advantages and disadvantages of ultrasonic flow meter

by:Sincerity     2022-08-10
Abstract: The advantages and disadvantages of ultrasonic flowmeters are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Ultrasonic flowmeter is a non-contact instrument, which can measure the flow of medium with large diameter and can also be used for the measurement of medium that is not easy to contact and observe. Its measurement accuracy is very high, and it is hardly disturbed by various parameters of the measured medium, especially. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the advantages and disadvantages of ultrasonic flowmeters. Ultrasonic flowmeter is a non-contact instrument, which can measure the flow of medium with large diameter and can also be used for the measurement of medium that is not easy to contact and observe. Its measurement accuracy is very high, and it is hardly interfered by various parameters of the measured medium. Disadvantages The main disadvantages are 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 data of the sound transmission velocity of the measured fluid at high temperature is incomplete. At present, my country can only be used to measure fluids below 200 ℃. In addition, the measurement circuit of the ultrasonic flowmeter is more complicated than that of the general flowmeter. This is because the flow velocity of the liquid in general industrial measurement is often several meters per second, and the propagation velocity of the sound wave in the liquid is about 1500 m/s. 3 orders of magnitude. If the accuracy of measuring the flow rate is required to be 1%, the measurement accuracy of the speed of sound needs to be in the order of 10-5 to 10-6, so there must be a perfect measurement circuit to achieve this. The reason why the technology can be practically applied under the premise of the rapid development of technology. Ultrasonic flowmeter consists of three parts: ultrasonic transducer, electronic circuit and flow display and accumulation system. The ultrasonic transmitting transducer converts electrical energy into ultrasonic energy and transmits it into the fluid to be measured. The ultrasonic signal received by the receiver is amplified by the electronic circuit and converted into an electrical signal representing the flow, which is supplied to the display and totalizer for display. and accumulative. In this way, the detection and display of traffic is realized. Ultrasonic flow meters commonly use piezoelectric transducers. It utilizes the piezoelectric effect of piezoelectric materials, and uses a suitable transmitting circuit to add electrical energy to the piezoelectric element of the transmitting transducer to generate ultrasonic vibration. The ultrasonic wave is injected into the fluid at a certain angle and propagated, and then received by the receiving transducer, and converted into electrical energy through the piezoelectric element for detection. The transmitting transducer utilizes the inverse piezoelectric effect of the piezoelectric element, while the receiving transducer utilizes the piezoelectric effect. The piezoelectric element of the ultrasonic flowmeter transducer is often made into a circular sheet that vibrates along the thickness. The diameter of the sheet is more than 10 times the thickness to ensure the directionality of the vibration. The piezoelectric element material is mostly lead zirconate titanate. In order to fix the piezoelectric element, so that the ultrasonic wave can be injected into the fluid at a suitable angle, it is necessary to put the element into the vocal wedge to form the whole transducer (also known as the probe). The material of the acoustic wedge not only requires high strength and aging resistance, but also requires that the energy loss of the ultrasonic wave after passing through the acoustic wedge is small, that is, the transmission coefficient is close to 1. A commonly used acoustic wedge material is plexiglass, because it is transparent and the assembly of piezoelectric elements in the acoustic wedge can be observed. In addition, some rubber, plastic and bakelite can also be used as sound wedge materials. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Pros and Cons of Ultrasonic Flow Meters'
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