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Title: Development Of A Bench-Top Time Proportional Humidity Generator With Chilled Mirror Hygrometer Reference Standard
Author: Jeff Hawkins, Ken Soleyn
Source: 2004 Measurement Science Conference
Year Published: 2004
Abstract: Divided-flow volumetric mix ratio techniques for the creation of controlled humidity environments have been in use for many years. These techniques typically operate under flow rate control whereby a continuous stream of saturated air (wet) is mixed in selected proportion with a continuous stream of dry air. The resultant mixed air stream embodies a partial water vapor pressure somewhere between zero and the saturation vapor pressure, dependent upon the selected volumetric mixing ratio. The design approach for this bench-top humidity calibration chamber utilizes volumetric mixing of dry air and saturated air via time proportioning of a three-way solenoid activated valve. An integrated NIST traceable chilled mirror hygrometer provides humidity measurement for feedback control of the test environment via microprocessor controlled time proportioning of the wet and dry air streams. System design considerations and validation data chronicling the chambers accuracy, stability, and response time are presented.

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