Patent ID: 9588092
Date: 2017-03-07
CPC Classifications: G01N

Claim:
1. A relative humidity (RH) generator comprising: a lower component having a first chamber having an upper opening and being configured to contain liquid water and generate a first RH within the first chamber; an upper component including a second chamber having an upper opening and a lower opening, the upper component being coupled to the lower component to couple the upper opening of the first chamber to the lower opening of the second chamber, the second chamber being configured to contain salt and generate a second RH within the second chamber; wherein the second RH is predetermined based on the salt positioned in the second chamber; and a first membrane positioned between the first chamber and the second chamber to allow water vapor to pass between the first and second chambers through the first membrane; wherein the upper component is adapted to be coupled to an RH probe with a second membrane separating the upper opening of the second chamber from the RH probe, such that the second membrane allows water vapor to pass between the second chamber and an RH sensor of the RH probe to thereby expose the RH sensor to the second RH; wherein the RH generator is operable to distill ordinary tap water from the first chamber into to purified water vapor that passes through the first membrane; and wherein the second RH is lower than the first RH, and the RH generator is operable to distill water by causing water vapor from the first chamber to diffuse through the first membrane into the second chamber due to difference between the first RH and the second RH.