FIG. 1. Schematic drawing of the automatic flask sampling apparatus. After a predrying step (membrane dryer close to the air inlet) one of the two cold traps dries the sample air to a dewpoint below 2408C, while the other twin cold trap is regenerated at 1408C. The cryocoolers of the dewar vessels and the control electronics are not shown here. The detailed working scheme is explained in the text.
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