Micromeritics DVVA II 4000 Operator's Manual page 182

Troubleshooting
Problem
Inconsistent results when
conditioning the tip
9-2
Cause
Different amounts of the
sample were used.
The same type of sample was
not used for all analyses.
All samples were not prepared
in the same manner.
The piston tip is not securely
affixed to the piston.
The upper or lower piston tip is
dirty.
The piston tip is damaged.
Not enough sample runs have
been performed.
DVVA II 4000
Solution
Use 1.0000 gram, ± 0.05
(determined to nearest 0.0001
gram) of sample for each
analysis.
Use the same type of sample
for all analyses.
Use the same preparation
method for all samples.
Moderately tighten the tip
using a 3/8-in. wrench.
Wipe the piston tips with a
Kimwipe or paper towel
between each blank analysis
and each sample analysis.
Replace with a new tip and
perform the conditioning
procedure.
Perform additional sample
runs.
400-42803-01 (Rev B) - July 2017