Factors Affecting the Measurement Accuracy of Ultrasonic Flow Meters

Abstract: The information on factors affecting the measurement accuracy of ultrasonic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. 1. The influence of the upstream and downstream straight pipe sections on the measurement accuracy of the ultrasonic flowmeter. The calibration coefficient K is a function of the Reynolds number. When the fluid changes from laminar flow to turbulent flow, and the flow velocity distribution is uneven, the calibration coefficient K will change greatly, resulting in a decrease in measurement accuracy. according to. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the factors affecting the measurement accuracy of ultrasonic flowmeters. 1. The influence of the upstream and downstream straight pipe sections on the measurement accuracy of the ultrasonic flowmeter. The calibration coefficient K is a function of the Reynolds number. When the fluid changes from laminar flow to turbulent flow, and the flow velocity distribution is uneven, the calibration coefficient K will change greatly, resulting in a decrease in measurement accuracy. According to the requirements of use, the ultrasonic flowmeter transducer should be installed at a position where the upstream straight pipe section is 10D and the downstream straight pipe section is 5D. For the length of the straight pipe section when there are pumps, valves and other equipment upstream, it is required to“The farther away from the sources of turbulence, vibration, heat, noise and radiation, the better”. If there are pumps, valves and other equipment upstream of the installation position of the ultrasonic flowmeter transducer, the straight pipe section is required to be more than 30D. Therefore, the length of the straight pipe section is the main factor to ensure the measurement accuracy. 2. The influence of pipeline parameter equipment on the measurement accuracy of ultrasonic flowmeter. Whether the pipeline parameter setting is accurate or not is closely related to the measurement accuracy. If the settings of the pipe material and size do not match the actual one, there will be an error between the theoretical pipe flow cross-sectional area and the actual flow cross-sectional area, resulting in inaccurate final results. In addition, the emission distance between the transducers of the ultrasonic flowmeter is the result of comprehensive calculation according to various parameters such as fluid (speed of sound, dynamic viscosity), pipeline (material and size), and the installation method of the transducer. The deviation of the distance will also cause a large measurement error. Among them, the setting and installation distance of the inner diameter of the pipeline have a prominent influence on the measurement accuracy. According to the relevant data, if there is an error in the pipeline±1%, it will cause about±3% flow error; if installation distance error±1mm will yield±Flow error within 1%. It can be seen that only by setting the pipeline parameters correctly, the ultrasonic flowmeter can be installed accurately and reduce the influence of pipeline parameters on the measurement accuracy. 3. The influence of the installation position of the ultrasonic flowmeter transducer on the measurement accuracy. There are two ways to install the transducer: reflective and direct. If the direct installation is used with a short sound velocity stroke, the signal strength can be enhanced. 4. The influence of couplant on measurement accuracy. In order to ensure full contact with the pipeline, it is necessary to apply a layer of couplant evenly to the surface of the pipeline when installing the transducer, and the general thickness is (2mm).—3mm). Remove the air bubbles and granules in the couplant so that the emitting surface of the transducer is closely attached to the tube wall. Flow meters for measuring circulating water are mostly installed in wells, where the environment is humid and sometimes flooded. If a general couplant is used, it will fail in a short time, affecting the measurement accuracy. Therefore, a special waterproof couplant must be selected, and the couplant should be used within the validity period, usually 18 months. To ensure measurement accuracy, the transducer should be reinstalled and the couplant replaced every 18 months. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Factors Affecting the Measurement Accuracy of Ultrasonic Flow Meters'

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