Abstract
A portable on-site gas flow standard device based on the standard meter method is designed to ensure metering accuracy in the natural gas trade. The standard device is optimized using computation fluid dynamics simulation technology. The acquisition of high and low frequency pulse signals, video photoelectric signals, and manual trigger signals is realized. Non-fixed-point measurement is realized by corrected linear interpolation of fixed-point and least-squares construction of the instrument coefficient correlation. The flow rate range of the device is (0.65–650) m3 h−1 and the expanded uncertainty is 0.33% (k= 2). The device is compact, portable, and can be carried on a vehicle for on-site application. The device is compared with the bell-type gas flow standard device and the sonic nozzle gas flow standard device of Hebei Metrology Supervision and Inspection Institute. The experimental results show that the E n value of the device is 0.67, and the measurement repeatability is better than 0.12 %.
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