Abstract: For the continuous psychometric measurement of the concentration of a vaporous component in a gas, i.e., the moisture content of air, by using a "dry" thermosensor and a "wet" thermosensor, the wet thermosensor is arranged in the open upper end of a vertical tube, to the lower end of which a liquid of the same kind as the vaporous component is supplied in such a manner that the liquid forms a small body of liquid on top of the tube, the body of liquid completely covering the wet thermosensor and overflowing from the top of the tube down along the upper surface of the tube in the form of a continuous liquid film.

Abstract: A measuring device for determining the concentration of an absorbable component in a gaseous mixture includes a vertically oriented tubular housing, a vertical hollow tube positioned within the housing and having a heat conducting wall and an open mouth at its upper end; a stub connected to the lower end of the vertical tube for passing a stream of liquid absorbent upwardly through the vertical tube so as to form a free surface area above the mouth of the tube, the liquid absorbent overflowing along the outside of the hollow tube; a stub connected to the housing at a point above the upper end of the vertical tube therein for passing a flow of gaseous mixture past the free surface of the absorbent; a first temperature sensor within the vertical tube adjacent the mouth thereof and covered by the liquid absorbent flowing out of the mouth of the tube; and a second temperature sensor located within the housing to measure the temperature of the gaseous mixture immediately before it contacts the liquid absorbent at

Abstract: A small stream of an absorbent material is exposed to a gas flow of which the concentration of a given component is to be determined. Heat is released during the resulting absorption process, and the stream of absorbent material will exhibit an overtemperature in relation to the surrounding gas flow. An indication of the concentration of the absorbed component is provided by the overtemperature.The temperature of the stream of absorbent material is adjusted before it comes into contact with the gas flow in such a way that the quantity of heat which is released during the absorption process will be transferred in its entirety to the surrounding gas flow by convection.This method makes possible the precise and continuous determination of the concentration, which is insensitive to variations in temperature and pressure and to changes in the speed of the gas flow past the point of measurement and in the magnitude of the stream of absorbent material.