Chapter 2 Hardware features
Page 2-2 MAN 0386
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How the dispersion unit works
This diagram shows the features of the dispersion unit:
ill 7765
The dry powder sample is manually placed in the sample tray with the air supply
and vacuum extraction system connected. When the sample tray is vibrated the
sample travels down the tray until it eventually falls into the main feed mechanism.
The rate at which the sample is fed is governed by the amplitude of vibration on the
sample tray (controlled from the software) and also by the gap between the feed
gates
on the sample tray.
At the entrance to the main feed mechanism is a wire sieve filled with ball bearings
. The ball bearings smooth the flow of sample and also help to break up loose
agglomerates within the sample.
As the sample falls through the sieve it is accelerated by compressed air within a
venturi where agglomerates are dispersed. The sample is then directed through the
air cell
fitted to the Mastersizer, where it is measured and then collected by the
vacuum extracting system at the rear of the air cell.
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MAN0386-1.0 Scirocco 2000.book Page 2 Friday, March 16, 2007 4:15 PM
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