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根据国家标准规定液化石油气钢瓶在进行气密性试验之前必须进行检验，瓶内残气体积分数不得高于０．４％，用接触燃烧传感器作为检测仪器的敏感元件时，由于输出的电压与可燃性气体体积分数之间几乎是线性关系，对不同气体成分，爆炸下限值几乎有相同的灵敏度，所以用异丁烷对仪器进行标定，并且以０．４％异丁烷体积分数作为报警点，保证了检测工作的安全
According to national standards, liquefied petroleum gas cylinders must be inspected before the gas tightness test. The residual gas volume fraction in the bottle shall not exceed 0.4%. When the contact burning sensor is used as the sensing element of the testing instrument, the output voltage and Combustible gas volume fraction is almost linear relationship between the different gas composition, the lower explosive limit almost the same sensitivity, so the instrument is calibrated with isobutane, and 0.4% isobutane volume fraction as an alarm Point to ensure the safety of testing