The molecular seive humidity pre adsorption rate measuring method

The molecular seive humidity pre adsorption rate

measuring method

1.The Measuring Procedure:

1.1Use tube cutter to open the filter drier,put all the molecular seive to porcelain crucible rapidly,and then add the cover and measure the net weight(correct to 0.001g).

1.2put the porcelain crucible which has sample of molecular seive to a  box type resistance furnace,and bake 1hour at 550℃

1.3.get out the porcelain crucible and put cover on it and then put into glass vaccum vessel rapidly,use vaccum pump to remove the air.after it gets cold,( 30 mins) measure the weight again（correct to 0.2mg）

2.cauculate the result.

2.1 The pre adsorption rate is calculated as follows:

a=(m1-m2)÷m2   （correct to 0.01%）

  a——pre adsorption %；

       m1——weight before activation，g；

       m2——weight after actication，g；

3.national standard

3.1 molecular seive pre adsorption rate≤1.5%

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