Watchful problem answers in the experiment:

It is different that * passes through a quantity to different material gas, the size that the basis answers to pass through a quantity before the experiment chooses appropriate adapter.

* must take care daub vacuum fat, if grease besmear was in,gas passes through area inside, polluted test area, can cause certain effect to checking a result thereby. Should notice when daub vacuum fat daub is even, may affect the position of the sample in checking an area otherwise, fold appears when causing sample likely also to close in fluctuation antrum, those who affect whole test system is sealed. In addition, should maintain daub to measure moderate, daub can cause the waste of vacuum fat and the pollution that check an environment too much, daub may appear too less the place that leakage besmears, the sealed effect of down to system not beautiful, cause experiment failure.

* filter paper should dry cleanness, and in the need when placing special attention does not stick vacuum fat, also do not want deviate to appoint the position, will affect test result otherwise, reduce experiment efficiency. When if discover filter trimming reason,having oil, should change in time filter paper.

* secures sample carefully. This kind of fluctuation speech that tests methodological test speech is to rely on clamping apparatus to apply force to come of locking, sealing ring place avoids to relapse to chafe and cause loss to sample to sample when fixed sample, especially bigger to velar ability tigidity be like vacuum plating aluminous film, the antrum on front of aluminous layer of the plating in the experiment, easy injury plating is aluminous when fixed sample layer; And when face of plating aluminous layer is down antrum, the meeting in the measure of vacuumize makes plating aluminous layer is affected certainly, reduce block oxygen performance thereby.

* gas passes through directional problem. A few material besmear via the surface especially the composite material of cloth, its positive and negative

The oxygen of the face passes through a quantity to gauge result difference through quantity and vapor bigger.

2, etc control a standard

Basis standard: ASTMD3985-1995 " the experiment method that checks filmy oxygen to pass through a quantity with coulomb sensor "

Detect equipment: Mocon appears oxygen instrument

Use sample to will permeate antrum to separate the air current system that becomes independent into two, the test gas that a side is flow (can be pure oxygen or it is the gas mixture that contains oxygen) , another side is dry nitrogen of flow. The pressure of sample both sides is equal, but aerobic cent is pressed different. In oxygen chroma wrong action falls, in oxygen passes through film and be being sent to sensor by azotic air current, measure the oxygen tolerance that carries in air current giving nitrogen accurately by sensor, calculate thereby the aerobic transmitance that gives data. Unit Mol/m·s·Pa.
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