Micromeritics TRISTAR II PLUS Operator's Manual page 76

4 Parameter Files
Analysis Conditions (continued)
Selections
4 - 8
Description
uation after the free space measurement in the Evacuation time
field. If using a cryostat, the operator must manually move the
cryostat assembly when prompted.
Evacuation time. The length of evacuation time prior to free
n
space measurement.
Outgas test. Checks for system leaks or sample outgassing.
n
After free space is measured, the Dewar is lowered and the
sample evacuated for the specified amount of time. The leak test
is performed after evacuation. If the pressure rises more than
0.025 mmHg within the time specified in the Outgas test duration
field, outgassing is present. If a leak is found, the analysis stops
and the operator is notified. While leak testing slightly increases
analysis time, it prevents the continuation of analysis and col-
lection of erroneous data if a leak occurs.
Enter. Measures free space after analysis ends. Enter the estimated
free space measurements.
Ambient free space. Empty sample tube gas capacity measured
n
at room temperature.
Analysis free space. Empty sample tube gas capacity measured
n
with the Dewar raised.
Calculate. Use to have the free space measurement calculated
using the sample and tube parameters.
TriStar II Plus Operator Manual
303-42800-01 (Rev M ) — Sep 2023