Accuracy of swirl flow meter?
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I would like to ask everyone: 1. Is the accuracy of a vortex-inflow meter higher than that of a vortex street flow meter? 2. The accuracy of vortex flowmeters for measuring liquids (0.75%) differs from that for measuring gases and steam (1%). Manufacturer datasheets for these flowmeters usually do not make such a distinction; is there actually a difference in accuracy?
1. The accuracy of rotary vane flowmeters is generally considered to be higher than that of vortex flowmeters. The accuracy of rotary vane flowmeters can reach ±0.5%, and sometimes even higher, while the accuracy of vortex flowmeters is typically around ±1%. This is because swirl flow meters are less affected by fluid disturbances during measurement, allowing for a more stable flow measurement. 2. For vortex flowmeters, the accuracy does indeed differ when measuring liquids (around 0.75%) compared to when measuring gases or vapors (around 1%). This is mainly due to the measurement principle of vortex flow meters, which results in slightly different responses to various media. In the manufacturer’s specifications, vortex flowmeters do not indicate the accuracy levels for measuring different types of media; this is usually because their measurement principle makes them relatively robust to changes in the fluid, resulting in less impact on accuracy. However, in practice, vortex flowmeters may exhibit slight differences in accuracy when measuring different media (especially liquids and gases), but these differences are usually small and not as noticeable as those seen with vortex street flowmeters. The specific differences depend on the detailed data and testing conditions provided by the manufacturer. .
1. Rotary vane flowmeters and vortex flowmeters can be considered as flowmeters based on different principles, and there is no advantage in terms of accuracy between the two； 2. The accuracy of the flow meter is subject to the manufacturer’s accompanying documentation.
Vortex flowmeters and rotameter types both belong to the category of velocity-type flowmeters; they differ in structure, but there is no fundamental difference in their accuracy. The accuracy values claimed by manufacturers are usually determined through tests using water or air. When these devices are used with specific media, their actual accuracy may vary significantly from the claimed values. For the metering of industrial media transfer, an accuracy of 1% is considered quite good; there is no need to pursue overly high and unrealistic claims of precision. If there are truly very high requirements for precision, then it’s better to use a mass flow meter