On measurement uncertainty of a vortex flowmeter

J. J. Miau, C. F. Yeh, C. C. Hu, J. H. Chou

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19 Citations (Scopus)


The measurement uncertainty of a T-shaped vortex flowmeter was examined with a gas flow calibration facility, for Reynolds numbers, Red, in a range of 2.56 × 104-1.56 × 105. The total uncertainty interval of the Strouhal values deduced from a Fourier spectral analysis was ±0.745%, and the linearity of the data was ±1.78%. Meanwhile, a scheme based on pulse counting in reference to the analog signals measured gave the total uncertainty interval of the meter factor as ±0.568%, with the linearity ±1.89%. Further, the flowmeter was tested in a fully developed water pipe flow facility, for Red of 5.6 × 103-5.29 × 104. The vortex shedding frequencies were obtained with the techniques of Fourier transform and autocorrelation, respectively. At low flow rates, the autocorrelation technique gave a smaller uncertainty interval than the Fourier analysis did; at higher flow rates the situation was reversed. The linearity of the St values obtained in the water pipe flow experiment was ±0.391%, noticeably smaller than that obtained in the gas flow facility.

Original languageEnglish
Pages (from-to)397-404
Number of pages8
JournalFlow Measurement and Instrumentation
Issue number6
Publication statusPublished - 2005 Dec

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Instrumentation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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