一、引言根据JJG1040-2008《数字式光干涉甲烷测定器检定仪检定规程》的规定,在环境温度为(20±5)℃,环境相对湿度≤85%,周围环境无影响检定的干扰气体的条件下,采用气体活塞式压力计作为计量标准器检定光干涉式甲烷测定器。数字式光干涉甲烷测定器检定仪的示值误差用绝对误差表示,其中在相对于甲烷体积分数0~10%CH4测量段,以压力表示的测量范围为0~8k Pa,最大允许误差为±0.008k Pa,相对于甲烷体积 I. INTRODUCTION According to JJG1040-2008 “Digital Light Interference Methane Tester Verification Protocol”, the ambient temperature is (20 ± 5) ℃, the relative humidity ≤ 85%, no interference with the surrounding environment, the test of the interference gas Conditions, the use of gas piston gauge as a metrological standard light interference detector. The numerical error of the digital light interference methane detector calibrator is indicated by absolute error, where the pressure measurement range is 0 ~ 8k Pa and the maximum allowable error is ± 0% with respect to the CH4 measurement section with a methane volume fraction of 0 to 10% 0.008 kPa, relative to the methane volume