| 摘要 |
A system and method for providing a destination point with a gas having a selectable known humidity. A gas having an initial relative humidity is alternately directed in accordance with a duty cycle along a wet path effective for humidifying the gas to provide a wet gas, and a dry path effective for either maintaining the initial relative humidity of the gas or dehumidifying the gas to provide a dry gas. The wet and dry gas is blended to produce a blended gas having a selected relative humidity based upon the selected duty cycle.
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