Micromeritics ASAP 2020 Confirm Operator's Manual page 108

ASAP 2020 Confirm
Psat vs. T
(continued)
Real gas equation of state
Open
Adsorbed-phase free-
space correction
4-32
You can edit the table by clicking on the desired saturation
pressure or temperature and entering a different value.
Use to insert a new row above the selected line; the
Insert
cursor moves to the new line. Use
selected row.
This radio button and the one below it let you choose how to
account for non-ideal behavior of the adsorptive.
The real gas equation of state (EoS) calculations correct for
non-ideal behavior at all pressures and temperatures. There
are some adsorptives (like butane) that are significantly
non-ideal even at the pressures used in the 2020. The real
EoS calculations are necessary for analyses with these
gases. But even for nitrogen, these calculations provide
some improvement. Tables containing compressibility fac-
tors for several gases are installed with the ASAP 2020 soft-
ware. Use this option whenever a table for the adsorptive is
available.
Enables you to choose a compressibility factor table. The
gases included in the tables are: argon, carbon dioxide, car-
bon monoxide, ethane, ethylene, helium, hexane, hydrogen,
isobutane, krypton, methane, nitrous oxide, n-butane, neon,
ammonia, nitrogen, oxygen, pentane, propane, propene, sul-
fur hexaflouride, xenon.
Use the Save button if you wish to save the table under a
different name.
Adsorbed molecules occupy volume in the sample tube
reducing the cold free space; use this option to correct for this
effect.
This option should not be selected for blank tube analyses.
New
to delete the
Delete
202-42811-01 - Mar 2011