取样时通过控制采样流量，使样气流速模拟取样点管道中煤气流速达到等速取样的条件。
When sampling, the speed of sample gas is similar to the actural pipe gas by controlling the sample gas flow.
研究分析表明：尾气采样探头伸入排气尾管的长度及取样点前的测量管路密封性是保证测量结果正确性的主要因素。
The result shows that the length of the sampling pipe inserted into the vent-pipe and the vent-pipe's airproof are the key factors for the correct exhaust emissions results.
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