Factors affecting the accuracy of vortex flowmeters

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　　Vortex flowmeters are adopted in various industries due to their simple structure, low maintenance requirements, consistent accuracy, ease of operation, and wide range of applications. The installation site of flow meters is often complex. The following are the common factors on-site that can affect the measurement accuracy of flow meters. Pulsating flow can impact the measurement results of most flow meters, leading to overestimations. Vortex flow meter sensors detect frequency signals, and vibrations can have a significant effect on these readings. An appropriate length of straight pipe sections before and after the meter helps ensure stable flow of the medium within the pipeline, thereby yielding the most accurate measurements. When the medium contains impurities that tend to adhere to the sensors and other components, it reduces the sensitivity of the sensors and alters their dimensions, which in turn affects various coefficients in the meter and results in unreliable measurement values. When the temperature of the measured medium is too high, the insulation resistance decreases as temperature rises, affecting the output signal; it is recommended to use split-type flow meters for measuring high-temperature media. Re>10000 is a fundamental parameter for the operation of vortex flow meters, and only an appropriate flow range can meet the requirements of the client’s application. Shielded wires should be used for the connection lines, and the circuits must be grounded to prevent interference from external electrical signals, which could lead to inaccurate measurements. Low flow rates pose a significant challenge for vortex flow meters; when the flow velocity is too low, vortices do not form steadily, resulting in intermittent flow signals. The degree of matching between the inner diameter of the pipeline and that of the meter determines the magnitude of the measurement error. 　　Accurate measurement results depend not only on the quality of the flow meter but also on its use and maintenance in the field. By avoiding the above issues when in use, errors can be minimized.