Cryotrap for air pollution analyzer

In a cryotrap for an air pollution analyzer, the combination of:

• a core having first means for receiving a cooling gas expander;
• a length of tubing carried on said core defining a gas flow path around said gas expander;
• an electric heater on said core, with said tubing disposed between said heater and expander;
• and
• a support for said core having a first central plate and a plurality of second insulator plates, with at least one second plate on each side of said first plate, and with said core positioned in said first plate.

In a cryotrap for an air pollution analyzer, the combination of:

• a core having a first opening for receiving a cooling gas expander and a helical groove around the exterior thereof;
• a length of tubing carried on said core in said helical groove and defining a gas flow path around said gas expander;
• an electric heater on said core, positioned around said core over said tubing;
• a copper foil wrapped around said core over said heater;
• and
• a support for said core having a first central plate and a plurality of second insulator plates, with at least one second plate on each side of said first plate, and with said core positioned in said first plate,
• with each of said first and second plates of a low density, closed cell, rigid foam thermal insulation with a plurality of openings therethrough, and a metalized plastic film on each side of the plate, and with crumpled metalized plastic film filling said openings of said second plates.