HUMIDITY GENERATOR

摘要

There is disclosed a humidity generator comprising: means for producing and conducting (10) a dry air flow; means for producing and conducting (12) a wet air flow; variable ratio mixing means (14a, 14b, 16) for mixing the wet and dry air flows to produce a combined air flow of selectable relative humidity; means for conducting (18) the combined air flow; a temperature selectable thermostatic enclosure (20) enclosing a portion of the combined air flow; relative humidity sensing (24) means positioned within said enclosure; temperature sensing means (26) positioned within said enclosure; and feedback control means, wherein the feedback control means (28) controls the temperature of the thermostatic enclosure (20) in response to the output of the temperature sensing means (26) so as to maintain a constant enclosure temperature, and controls the variable ratio mixing means in response to the output of the relative humidity sensing means (24) so as to maintain a constant combined air flow relative humidity.