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through nitrogen all transported to the sensor,which sensormust coulomb sensor method,which is consistent with an absolute value of thesensor Faraday's law,permeate passes over the oxygen sensor,the sensor willrelease electrons four times,depending on the size of the number of oxygenmolecules through the current sensor can be detected.And differential pressuremethod compared to equal pressure method is a more accurate,advanced testingmethods.In summary,the equal pressure oxygen permeation test method is moresuitable for accurate testing in high barrier materials.Standard ASTM D3985.Oxygen permeability is a company in the United States MOCON oxygen permeabilitytester OX-TRAN.Model 2/21(ASTM D-3985 and ASTM F-1927)system to complete.Chapter IV Figure 3-1 Research and.