| 摘要 |
A calibrating apparatus for isothermally introducing, into a stream of dry gas, amounts of moisture lower than 1000 ppb, said apparatus comprising: A. a moist gas generating unit (124, 320) , comprising in its turn: i) a cylindrical shell (126); ii) a permeation module (130), inside said cylindrical shell, containing water and comprising a peripheral membrane; iii) a thermal conditioner (132), arranged too inside said cylindrical shell, upstream of said permeation module; B. an isothermal heat sink (102, 314) , thermally connected to the outside surface of said cylindrical shell (126) , where in said moist gas generating unit (124) is lodged in a recess (104) of said heat sink (102); C. a heat radiator (108, 316); and D. a Peltier heater-cooler (112, 318) thermally arranged between said isothermal heat sink (102, 314) and said heat radiator (108, 316). <IMAGE> |
