Patent ID: 7578208
Filing Date: 2009-08-25
Classification: G01M

Abstract:
1. A system for providing a gas stream having an adjustable known humidity, comprising: (a) a source of a gas having an initial relative humidity, (b) a supply line in fluid communication with the gas source for directing gas from the gas source to a destination point, the supply line including: (c) at least one valve in fluid communication with the supply line for mutually exclusively effecting gas flow from the gas source along the wet path or the dry path, (d) whereby (i) effecting gas flow along the wet path only provides the destination point with a gas having the first known relative humidity, (ii) effecting gas flow along the dry path only provides the destination point with a gas having the second known relative humidity, and (iii) alternating gas flow along the wet and dry paths on a predetermined duty cycle provides the destination point with a gas having a known relative humidity between the first relative humidity and the second relative humidity.