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随着市场对天然气需求的不断扩大,天然气公司对流量计计量准确度的要求也变得越来越高,但是流量计的测量误差却是无法避免的,而不同的误差可以通过不同的方法来进行控制或减小,其中重要的未定系统误差可以通过不确定度来确定。因此如何正确合理地求出流量计的测量不确定度是十分必要的,本文将以旋进旋涡流量计的测量不确定度的分析过程为基础,指出了在合成标准不确定度以及扩展不确定度的表示中应当值得注意的地方。
As the demand for natural gas in the market continues to expand, natural gas companies have become increasingly demanding on the measurement accuracy of flowmeters. However, measurement errors of flowmeters can not be avoided, and different errors can be obtained through different methods Control or reduce, in which the important undetermined system error can be determined by the uncertainty. Therefore, it is very necessary to find out the measurement uncertainty of the flowmeter correctly and reasonably. Based on the analysis of measurement uncertainty of the precession vortex flowmeter, this paper points out that in the process of combining the standard uncertainty and the extended uncertainty Degree of the expression should be worth noting.