Abstract

This report documents the results of an evaluation of a portable, passive cryogenic sampler designed for the collection of whole air samples without loss or concentration of any atmospheric constituents. The design criteria included: (a) sample volume capacity greater than 100 liters STP; (b) no concentration or loss of atmospheric constituents; (c) no vertical dimension greater than 50 cm or horizontal dimension greater than 15 cm; (d) operation without electrical power; (e)sampling lifetime greater than two hours; (f) total gross weight less than 20 kg; (g) resistance to undetected tampering. The sampler described in this report has been found to meet or exceed the design criteria once safety-related add-ons (rotameter, pressure relief valves, and base-plate) are either removed or redesigned for a smaller profile.

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