Micromeritics ACCUPYC II 1345 Operator's Manual page 82

5 Parameter Files
Analysis Conditions for Pycnometry Analyzers (continued)
Field or Button
End equilibration by:
[group box]
Number of cycles
[text box]
Number of purges
[text box]
Percent full scale
[text box]
Purge fill pressure
[text box]
Record P1 equilibration
data [check box]
Record P2 equilibration
data [check box]
Use run precision
[check box]
For fields and buttons not listed in this table, see
tons on page 3 -
5 - 4
Description
Rate. Equilibration ends when the rate of pressure change drops
below the entered amount.
Time. Equilibration ends when the specified time interval is attained.
The number of cycles to be performed. A cycle is a series of func-
tions which equals to a single volume measurement.
The number of purges to be performed. A higher number of purges
will mean a cleaner sample.
Enabled when Use run precision is selected. Enter the run precision
volume tolerance which is expressed as a percent of nominal cell
volume (sample capacity).
The purge fill pressure (in psig or kPa). For FoamPyc analyses, the
typical pressure is 3.5 psig. For analyses on standard samples, the
measured volume is more precise if a greater fill pressure is used.
The default of 19.500 is appropriate for most standard analyses.
Some materials, such as organic polymers, may require a lower
pressure in order to limit permeability into the sample matrix.
The default is 500 psig for the High Pressure sample chamber.
Record first. Enter the number of cycles to be recorded at the
beginning of the analysis.
Record last. Enter the number of points to be recorded at the end
of equilibration.
Select to use run precision. This feature provides early termination
of the analysis when certain criteria are met. The analysis ter-
minates after five consecutive cycles are within the specified tol-
erance. Typically, a large number (50 to 99) of cycles is requested. If
a small number of runs is selected, the analysis stops when the
entered number is reached even though the specified tolerance has
not been met. If fewer than five cycles are requested, this feature is
disabled.
2.
Common Fields and But-
AccuPyc II 1345 Operator Manual
134-42851-01 (Rev A) — Jan 2021