定積加水露点計

抄録

A new method for determining the dew point by injecting water into a sample gas of constant volume is investigated.
A sample gas and a dry gas are contained in two vessels of equal volume which are connected to a U-tube manometer between them. Firstly, both the gases are at the same temperature T₁ K and equal pressure. Secondly, the temperature of both the gases are changed to a suitable temperature T₂(T₂_??_T₁) K, and then a difinite amount of water is injected into the sample gas. The dew point, if the volumes of the gases are kept unchanged, is determined theoretically from the three measured quantities, namely, T₁ K, T₂ K and the pressure difference between the gases. When the volume of the gases are not kept strictly constant, the correction due to volume change by the injecting water and the pressure of the manometer is discussed.
Experimental data measured with the air passed through the saturator are presented. The experimental results show that the dew point can be accurately determined by the above mentioned method.