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Can I block the inlet and outlet of a unit purged with nitrogen to prevent oxygen contamination?

April 26, 2017block contamination Inlet nitrogen outlet oxygen purged

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Can I block the inlet and outlet of a unit purged with nitrogen to prevent oxygen contamination?

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The unit is not designed to hold a low oxygen reading with no flow. Without flow, ambient O2 will leak in and cause the reading to rise. Special versions of the unit equipped with isolation valves are available.