TriStar II 3020 Report Options Files
302-42828-01 - Dec 2012 5-41
Alpha-S Method
The Alpha-S plot converts the standard adsorption isotherm into a dimensionless isotherm using the
quantity adsorbed at a relative pressure of 0.4. In the Selected Reports list box, highlight Alpha-S
Method, then click Edit.
One predefined curve is shipped with the analysis program and is located in the Reference directory.
Use the table to enter relative pressure and the alpha-s values.
Field or Button Description
Open button To import values from an existing thickness curve (.ALS ASCII file), click
Open, and select the file containing the values.
The table to be imported must be saved as ASCII text with a .ALS
extension. It must have a two-column format with the relative pressures in
the first column and the alpha-s values in the second column. Columns
must be separated by a space or a tab.
Relative pressure
range text boxes
Enter the pressure range when calculation assignments are not used.
Fitted Alpha-S range
text boxes
Enter minimum and maximum relative pressures to determine the fit.
Ref. surface area
text box
Enter the surface area from the reference curve. This value is used to
calculate the sample surface area.
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