Influence of Noise on Ultrasonic Flow Meters

Abstract: The information on the impact of noise on ultrasonic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. Ultrasonic flowmeters are more and more widely used in today's industrial production, and the types of industrial applications involved are becoming more and more abundant. Heshunda's technicians have noticed that gas ultrasonic flowmeters have become more and more widely used in natural gas pipeline measurement. Applications. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the impact of noise on ultrasonic flowmeters. Ultrasonic flowmeters are more and more widely used in today's industrial production, and the types of industrial applications involved are becoming more and more abundant. Technicians have noticed that gas ultrasonic flowmeters have been more and more widely used in natural gas pipeline measurement. , because the ultrasonic measurement principle uses the characteristics of ultrasonic transmission, in other words, the ultrasonic flowmeter actually works with sound waves, because unnecessary ultrasonic noise will be generated during the gas production process, which will directly affect The normal operation of the ultrasonic flowmeter will adversely affect the accurate measurement of the ultrasonic flowmeter. Regarding how to reduce or even eliminate the impact of noise on ultrasonic flowmeters, the following measures can be implemented: Control valve noise and noise reduction measures A. Control valve noise In the production process of natural gas pipelines, the control valve is the most commonly used control valve. pressure equipment. When the regulating valve performs pressure regulation, noise in a wide frequency range will be generated, including ultrasonic noise in the ultrasonic frequency range. The noise essentially has the physical properties of sound waves, and its size is related to factors such as the type of valve, gas flow rate and pressure differential pressure. After the noise is generated, it will propagate to the upstream and downstream of the regulating valve. However, due to the pressure difference of the regulating valve, the gas is tightly compressed downstream at the orifice, so that the main noise energy propagates downstream in the form of shock waves, and relatively little noise energy propagates upstream. For the ultrasonic flowmeter, the ultrasonic pulse of its transducer has a specific operating frequency, and the pulse frequency of the ultrasonic flowmeter used for natural gas measurement is above 120kHz. The transducer only responds to the pulse signal of its working frequency. If the noise frequency generated by the pressure regulation of the regulating valve reaches the working frequency of the transducer and propagates through the airflow medium to reach the ultrasonic flowmeter, the transducer will not be able to detect and distinguish normally. A working pulse signal is output, resulting in a metering failure. B. Noise reduction measures In the design and use of ultrasonic flowmeters in working conditions with regulating valves, noise reduction measures should be fully considered. 1) Since the noise energy propagating to the upstream of the regulating valve is much smaller than the noise energy propagating downstream, the regulating valve should be first considered to be installed downstream of the ultrasonic flowmeter, and the installation distance should be as large as possible. All in all, we should pay full attention to the design and installation of ultrasonic flowmeters with noise sources in the practice process, and pay close attention to the following aspects, so as to effectively avoid the occurrence of ultrasonic noise affecting the normal operation of the flowmeter: 1) Install the ultrasonic flowmeter upstream of the control valve, and try to ensure sufficient distance between the two; 2) Install pipe fittings such as T-shaped pipes between the ultrasonic flowmeter and the control valve to achieve the purpose of attenuating noise; 3) Understand the ultrasonic The operating frequency of the flowmeter and the frequency range of the noise generated by the regulating valve, consider using an ultrasonic flowmeter with a higher emission frequency to improve the signal-to-noise ratio; 4) In the preliminary design or transformation stage of the ultrasonic flowmeter, strengthen the design unit's process and instrument expertise It is very important to communicate with the manufacturer in advance, and to consult with the manufacturer in advance; 5) Through experiments, operations and foreign experience, the relevant specifications for the design and installation of ultrasonic flowmeters in my country's natural gas pipeline industry should be improved and refined as soon as possible. As a highly precise instrument, the flowmeter not only needs to strictly abide by its requirements in the process of manufacture and use, but also must pay special attention in the later maintenance so as not to retire the flowmeter early. If you have other questions or needs about the flowmeter, you can contact the flowmeter manufacturer and we will serve you wholeheartedly. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Influence of Noise on Ultrasonic Flow Meters'

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