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Accession Number:
AD0623966
Title:
MULTI-STAGE CRYOGENIC TRAPPING SYSTEM,
Corporate Author:
SCHOOL OF AEROSPACE MEDICINE BROOKS AFB TX CHEMICAL SUPPORT SECTION
Report Date:
1965-01-01
Abstract:
A portable, easily operated, multi-stage cryogenic trapping system contained in a box 86 x 66 x 61 centimeters was developed. Liquid nitrogen, gaseous nitrogen, ice, dry ice and 110 volt 60 cycle power required for operation of the system are available to most military installations. Ice formation in the -78C trapping cylinder entrance tube and liquid oxygen formation in the -175C trapping cylinder were eliminated in the design of the system. Catalytic conversion of trapped materials was minimized by use of stainless steel and Teflon. Operation of the system was simplified by inclusion of a liquid nitrogen level-controller. Partial separation of compounds was accomplished by operating the trapping cylinders of the system at three different temperatures. Several compounds are listed according to the temperature at which they are expected to be concentrated in significant quantities. The system is efficient for concentration of micro and macro contaminants in an atmosphere. The concentration of a contaminant in a sample area may be estimated from the total trapping time, the flow through the system during trapping and the concentration of the contaminant in the trapping cylinders.
Supplementary Note:
Pub. in Aerospace Medicine V36 N9 P869-74 Sep 1965.
Pages:
0006
Distribution Statement:
Approved for public release; distribution is unlimited. Document partially illegible.
File Size:
0.50MB
