Compared the measured results by Orsat apparatus and analyzed the causes of error in small nitrogen production, it provides the basis for the correct use of Orsat apparatus and guiding production. 根据小氮肥厂的条件,对奥氏仪测定结果进行一些比较,分析误差产生的原因,并对最大误差进行计算。为正确使用奥氏仪,运用分析结果指导生产,提供了参考数据。