MULTI-STAGE CRYOGENIC TRAPPING SYSTEM,
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0623966
Entities
People
- Gordon L. Worth
- James P. Conkle
- James W. Register