A flowing wet C steam humidity measurer of double layer tube direct C heating type is prepared as connecting inlet section to heating section being connected to outlet section, setting middle layer heating tube in outer jacket of internal layer heating tube at heating section, setting external layer support tube in outer jacket of middle layer heating tube, insulating said tubes to each other and holding gap between them, connecting inlet section to one end of heating section by left connection component and outlet section to another end of heating section by right connecting component, setting directional needle tube in inlet section and connecting said needle tube to piping connection box of outlet section. |