Calibrating apparatus for isothermally introducing moisture into a stream of dry gas at a very slow rate
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United States of America Patent
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Mar 15, 1994
Grant Date -
N/A
app pub date -
Feb 16, 1993
filing date -
May 26, 1992
priority date (Note) -
Expired
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Abstract
A calibrating apparatus for isothermally introducing, into a stream of dry gas, amounts of moisture lower than 1000 ppb, said apparatus comprising: A. a moist gas generating unit, comprising in its turn: i) a cylindrical shell; ii) a permeation module, inside said cylindrical shell, containing water and comprising a peripheral membrane; iii) a thermal conditioner, arranged too inside said cylindrical shell, upstream of said permeation module; B. an isothermal heat sink, thermally connected to the outside surface of said cylindrical shell, wherein said moist gas generating unit, under item A), is lodged in a recess of said heat sink; C) a heat radiator; D) a Peltier heater-cooler, thermally arranged between said isothermal heat sink (under item B) and said heat radiator (under item C).
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