测量建筑物空气渗透速率的一种方法是使用少量示踪气体。定期测量的气体浓度为评估渗透速率提供了依据。在下面的文章中，将讨论这类评估的两个基础-。衰变法和恒浓度法。描述了一种自动操作便携式电子捕获检测器/色谱仪并测量空气中六氟化硫（SF6）十亿分之一浓度的系统。它以1分钟的周期对空气进行采样。在衰减法中，半对数图上的浓度与时间的斜率可用于计算入渗速率。 在第二种方法中，系统以将示踪气体保持在固定的预定水平所需的速率注入SF6。渗透速率与必须注入示踪气体的速率成正比。引文:美国密歇根州底特律ASHRAE学报第85卷第2部分

One method of measuring rate of air infiltration in buildings involves t'he use of small amounts of a tracer gas. The concentration of the gas, which is measured at regular intervals, provides the basis for evaluating the infiltration rate. In the following paper, two bases for such evaluations are discussed -. the decay method and the constant concentration method. A system is described which automatically operates a portable electron capture detector/chromatograph and measures parts per billion concentrations of sulphur hexafluoride (SF6) in air. It samples air on a 1-min. cycle. In the decay method, the slope of concentration vs time on a semilogarithmic plot can be used to compute the infiltration rate. In the second method, the system injects SF6 at the rate required to maintain the tracer gas at a fixed, predetermined level. The infiltration rate is proportional to the rate at which the tracer gas must be injected.