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(一)基本原理原理图见图1。将氮气流经过水稳压器3及阻力毛细管4获得一定流速的氮气气流,然后通过恒温下的某液体1(即待测的)。一方面每个鼓泡被恒温下该液体的蒸汽压所饱和,同时有较大的液面产生的蒸汽压也能使上方空间气体再次饱和,最后从出口逸出流速为U、浓度为C_o的气体(相当于该恒温温度的饱和蒸汽),也就是配气原料气,它与大流速V升/分的稀释气汇合于混合器2中,经充分混合成所需标准气体。标准气体浓度C的计算见公式(1):C(微克/升)=C_o(微克/升)×U(毫升/分)/V(升/分)(1) 由此原理可以得出以下几个值得注意的问题:
(A) The basic principle of the principle diagram shown in Figure 1. Nitrogen flow through the water regulator 3 and the resistance capillary 4 to obtain a flow of nitrogen gas flow, and then through a certain temperature of the liquid 1 (ie, to be measured). On the one hand, each bubbling is saturated with the vapor pressure of the liquid at a constant temperature, and at the same time the vapor pressure generated by the larger liquid surface can also make the gas in the upper space re-saturate. Finally, the outlet velocity is U and the concentration is C_o The gas, which is equivalent to the saturated steam of the thermostatic temperature, that is to say the feed gas, joins with the dilute gas at a high flow rate of Vl / min in the mixer 2 and is thoroughly mixed to the required standard gas. The calculation of the standard gas concentration C is given by the following equation (1): C (μg / L) = C_o × U / ml / V (L / min) A noteworthy question: