Causes and Treatment of Errors of Vortex Flow Meters

Abstract: The causes and processing information of vortex flowmeter meter errors are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1 Influence of Reynolds number 1) Influence of Reynolds number. From the working principle of the vortex flowmeter and the relationship curve between the Strouhal number and the Reynolds number in Figure 4, we can know that the Reynolds number is within the range of 2104 to 7106, which is the normal working range of the instrument. The Reynolds number is 5103～. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the reasons for the error generation of the vortex flowmeter and the details of the treatment articles. 1 Influence of Reynolds number 1) Influence of Reynolds number. From the working principle of the vortex flowmeter and the relationship curve between the Strouhal number and the Reynolds number in Figure 4, we can know that when the Reynolds number is 2×104～7×Within the range of 106, it is the normal working range of the instrument. at a Reynolds number of 5×103～2×Although the range of 104 is also within the working range of the instrument, due to the increase of the Strouhal number, a measurement error will occur, and the flow coefficient needs to be corrected to ensure the accuracy of the flow measurement. 2) Correction of the influence of Reynolds number. There are generally two methods for correcting the influence of Reynolds number. One is done in the secondary flow meter, which is suitable for the measurement system where the vortex flowmeter itself has no correction ability. The other is implemented in a vortex flow sensor (transmitter), which is suitable for a measurement system in which the vortex flowmeter itself has the ability to correct. 2 The influence of fluid temperature changes 1) The influence of fluid temperature changes. From the working principle of the vortex flowmeter and formula (3), we can see that the flow coefficient K of the vortex flowmeter is affected by the fluid temperature and consists of two parts: a. It is caused by the change of the body width d; b. It is caused by the inner diameter of the pipe D changes caused. It can be seen from formula (1) that f is inversely proportional to d, and K is inversely proportional to D2. Since the temperature of the fluid used in practice is quite different from the fluid temperature at the time of design, the error introduced by this is considerable. 2) Correction for the effect of fluid temperature changes. The correction method for the effect of fluid temperature changes is to recalculate the flow coefficient according to the actual temperature of the fluid. 3 Influence of the accumulation on the upstream side of the generating body 1) The influence of the accumulation on the upstream side of the generating body. If there are viscous particles or fibrous substances with many inclusions in the measured fluid, they will gradually accumulate on the upstream surface of the vortex generating body, so that the geometry and size of the vortex generator will change, so the flow coefficient will also change accordingly, resulting in errors. . 2) Treatment of accumulation on the upstream side of the body. There is currently no good correction method for the effect of accumulation on the upstream side of the body. If necessary, it can be solved by replacing the generating body regularly. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Causes and Treatments for Errors of Vortex Flow Meters'

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