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Gas concentrators designed to increase the percentage of nitrogen in a mixture of gases, usually air. Nitrogen concentrators filter out moisture, oxygen, and other gases from compressed air, leaving ultra-high-purity nitrogen. A nitrogen concentrator is usually comprised of a compressed air tank; a permeable membrane or a sieve material that captures the oxygen, other gases, and water vapor; and a nitrogen receiving tank. Nitrogen concentrators are used mainly to obtain nitrogen gas appropriate for use as a carrier gas for use in laboratories (e.g., gas chromatography analytical laboratory systems).
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