Refrigeration – Low pressure cold trap process and apparatus
Patent
1994-12-14
1996-03-26
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
622351, 7386311, B01D 800
Patent
active
055010806
ABSTRACT:
Apparatus for obtaining a whole gas sample, composed of: a sample vessel having an inlet for receiving a gas sample; a controllable valve mounted for controllably opening and closing the inlet; a valve control coupled to the valve for opening and closing the valve at selected times; a portable power source connected for supplying operating power to the valve control; and a cryogenic coolant in thermal communication with the vessel for cooling the interior of the vessel to cryogenic temperatures.
A method of obtaining an air sample using the apparatus described above, by: placing the apparatus at a location at which the sample is to be obtained; operating the valve control to open the valve at a selected time and close the valve at a selected subsequent time; and between the selected times maintaining the vessel at a cryogenic temperature by heat exchange with the coolant.
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Bird Susan K.
Kotter Dale K.
McManus Gary J.
Motes Billy G.
Capossela Ronald C.
Lockheed Idaho Technologies Company
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