Browse Prior Art Database

Precise Static State Moisture

IP.com Disclosure Number: IPCOM000048411D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Browne, KP: AUTHOR [+4]

Abstract

A dry gas from supply 10 is passed through a moisture generator 12 to produce a known parts per million (PPM) of water (H(2)O) in the gas.

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Precise Static State Moisture

A dry gas from supply 10 is passed through a moisture generator 12 to produce a known parts per million (PPM) of water (H(2)O) in the gas.

The gas is allowed to flow through the generated sample container 14, through an Al(2)O(3) sensor 16 chamber, and then is exhausted. (Valves A, B, C and F are open). A frost/ dew point reading is obtained using a hygrometer.

When the frost/ dew point is stable, the sample container 14 is isolated from the system (Valve C is closed when the flow indicators show zero flow, and valve B is closed, trapping the moisture-generated sample to be used later).

Valve F is closed and valve D is opened, allowing the Al(2)O(3) sensor 16 chamber to be evacuated. This reduces the moisture content of the Al(2)O(3) sensor 16 thus lowering the frost/ dew point. When the desired frost/ dew point is obtained and is stable, valve D is closed.

Valve C is opened, allowing gas from generated sample container 14 to flow into the Al(2)O(3) sensor 16 chamber. When the frost/dew point is stable, a reading is obtained for a static state condition for a H(2)O parts per million sample. Pressure of the sample can be varied by using valve F to bleed off excess.

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