标准煤气表仪表系数测量不确定度分析

Evaluation of uncertainty in measurement for instrument coefficient of standard gas meter

本文简略介绍了标准煤气表的测量方法,并依据JJG267-1996标准煤气表检定规程和JJF1059-1999测量不确定度评定与表示,对标准煤气表仪表系数测量结果进行不确定度的评定。具体分述各个不确定度分量(包括标准煤气表示值、气体流量标准装置通过的气体体积、装置内压力、标准煤气表前压力、装置内气温、标准煤气表前气温、装置内的饱和蒸汽压、标准煤气有处的饱和蒸汽压、装置内气体相对湿度、标准煤气表处的气体相对湿度)的产生,并合成标准不确定度及给出有效自由度。

The paper briefly introduces measure method of standard gas meter.According to JJG267-1996 Verification Regulation of Standard Gas Meter and JJF1059-1999 Evaluation and Expression of Uncertainty in Measurement. The article evaluated uncertainty in measurement for instrument coefficient of standard gas meter. The sources of standard uncertainty are analyzed in detail. Such as indication value of standard gas meter, actual gas volume measured by the gas flow standard equipment, the pressure in the equipment and in front of the meter, the temperature of gas in the equipment and in front of the meter, the pressure of saturated steam in the equipment and the meter, the relative humidity of gas in the equipment and the meter.The combined standard uncertainty and effective degree of freedom are calculated.