Watchful problem answers in experiment process: * is dry in 200 ℃ oven the desiccative of 2h, put in desiccator, time cannot grow too, answer to undertake stoving afresh otherwise.

When * checks sample, should choose level off, even, wait for the place of blemish without hole, pinprick, cut, fold, qualitative to two surfaces ability not same sample, vapor of Lv of take an examination passes through direction, in face of positive and negative each take a group of sample.

* to fully low the sample with wet quantity or precision higher demand, answer to take a sample to have blank test at least.

* cuts the volume that takes sample into parts to should be less than cup annulus internal diameter to increase groove breadth slightly, otherwise sample appears easily when seal curly and bring about approved sample lax.

The affiliation of * desiccative is measured it is advisable to should make desiccative is apart from sample surface 3mm, notice desiccative does not want sample of bring into contact with.

* is sealed when the cup, should take care put ferrule on test sample, avoid to make check sample to get attrition and cut.

* seal temperature cannot exorbitant, the choice of temperature inspects the specific data that pack and decide. Do not allow to generate crackle and bubble after seal is caky. * should need sealed polish caky refrigeration is rear can keep clear of the sealed candle that is stuck in edge of fully wet cup and bottom, the avoid by all means when cleared seal cannot cause convert of fully wet cup appearance of sample of desiccative bring into contact with, cause certain effect to fully wet quantity thereby.

* metage time should accurate, weigh the order of measuring glass to answer every time identical.

* differs as a result of gimmick of the metage habit of everybody, metage, to same group sample the proposal had better undertake metage by same individual, in order to reduce the choice of condition of experiment of accidental error * : Should inspect item characteristics reachs particular use environment and decide. There is condition of two kinds of experiments to be able to offer an alternative in GB/T1037-1988:

Conditional A: Temperature 38 ℃ , relative humidity B of 90 ％ condition: Temperature 23 ℃ , relative humidity 90 ％

* every time the 1 ％ that metage time must not exceed time interval, in order to reduce the effect with metage wet to appearing environment.

* metage time-interval passes through the size of the quantity to choose time interval to be 24h, 48h or 96h according to packaging data.

The packing stuff that * shows wet cup increment to be less than total increment of 5mg or desiccative moisture absorption to exceed 10 ％ does not suit to use this kind of method to check.

2, infra-red calibrating law

Basis standard: ASTMF1249-2001

Detect equipment: Mocon appears principle of wet instrument experiment: This kind of method belongs to infra-red calibrating law, test film breaks up test antrum two parts, two parts all are kept apart with outside ambient and make air current and return circuit respectively, in the film that be measured a side is flowing the nitrogen air current of certain relative humidity, another side is dry nitrogen air current, water element can pass through the film that be measured to enter a side of dry air current from a side of wet air current, carry infrared sensor together along with dry nitrogen, measure the content of the vapor in giving nitrogen, reach vapor passes through a quantity then, unit G/m2/d.
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