Micromeritics AccuPyc II 1340 - Run Precision and Sample Analysis Calculations

AccuPyc II 1340 Appendix B
Aug 2013 B-3
Run Precision
Run precision requires at least five runs. Run precision criterion is met when the sample vol-
umes calculated for the four most recent previous runs fall within the specified error band for
the current run’s sample volume. The error band is a specified percentage of the nominal vol-
ume of the sample chamber (1, 10, 100, or 350 cm
3
and 2000 cm
3
).
V
samp
[0] to V
samp
[4] are the five most recent sample volumes, V
samp
[4] being the most recent.
where
V
nominal
= nominal sample cell volume
If for i = 0 to 3, run precision is achieved.
Total Pore Volume
where
D
bulk
= entered bulk density
Total Solids Concentration
where
D
liq
= entered liquid density
D
sol
= entered solid density
ErrBand PctFullScale
V
nominal
100
----------------
=
V
samp
i V
samp
4– ErrBand
TotalPoreVol
D
samp
D
bulk
–
D
samp
D
bulk

------------------------------=
WeightPctSolids 1
D
liq
D
samp
------------
D
sol
D
sol
D
liq
–
-----------------------
 100–=