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一、差压式流量计不确定度分析在GB/T2624-2006《用安装在圆形截面管道中的差压装置测量满管流体流量》中给出了标准差压式流量计不确定度的计算公式:在上述公式的6个不确定度分量中,流出系数不确δC/C定度会受到雷诺数Re的影响,所以目前好的流量计算机一般都带有雷诺数补偿功能;对于蒸汽而言,只要将Δp_1/p_1控制在较小的范围就可以将可膨胀性系数不确
First, the differential pressure flow meter uncertainty analysis GB / T2624-2006 “with a circular cross-section pipe installed in the differential pressure device measures the full pipe fluid flow” gives the standard differential pressure flow meter uncertainty Calculation formula: In the above six uncertainty components, the outflow coefficient uncertainty δC / C is affected by the Reynolds number Re’s influence, so good flow computers generally have a Reynolds number compensation function. For the steam As long as Δp_1 / p_1 is controlled to a small extent, the coefficient of expansibility can be incorrect