Bubble Determination; Particle Size Analysis - Micromeritics SediGraph III 5120 Service Manual

SediGraph III 5120 Service

Bubble Determination

Particle Size Analysis

Mar 2010
During the full-scale scan, the SediGraph III 5120
performs a bubble detection test. Because bubbles in
the sedimentation liquid could affect the accuracy of
the analysis, the pumping system attempts to remove
any detected bubbles before the analysis proceeds.
Shown for illustration is a "Small Bore" cell, most
cells are the "Large Bore" configuration and the In/
Out tubing is slightly different but, the operation is
exactly the same.
After the full-scale concentration data
have been collected, circulation of the
sample/fluid mixture is stopped abruptly
and sedimentation begins to occur. Dur-
ing sedimentation, the SediGraph III
5120 again passes the X-ray beam
through the analysis cell taking absor-
bance readings at the 220 data collection
points as in the 100 percent scan. An ele-
vator moves the cell down during this
sedimentation process to accelerate the
data collection. The analysis program
compensates for the movement of the
cell when calculating the particle falling
rates.
Bubble Determination
3-3