Apparatus for measuring the water content of a gas.

摘要

Apparatus for measuring a dew point or a frosting point in a gas at minus 80 DEG C or lower, which comprises a casing made of heat conducting material and having secured to an internal surface thereof a mirror capable of generating dew or frost derived from the water over a wide temperature range (and in particular over the range of room temperature to the temperature of liquid nitrogen), the casing also having a window through which light can be projected to impinge on the mirror during use of the apparatus, means for heating the casing, means for cooling the temperature of the casing in the vicinity of the mirror and means for introducing the gas into the casing. <IMAGE>