Chapter 2 Hardware features
Page 2-6 MAN 0386
This tray is not suitable for samples having broad size distributions unless
several repeat measurements are made. Repeat measurement tests need to
be carried out to determine the exact number of repeat measurements to
give the required standard of repeatability.
Small volume tray – if the small size of the micro volume tray proves to
be a problem in terms of repeatability, the small volume tray provides a
compromise. Again, it has a fixed width slit to eliminate one source of
method variation.
Gates
The gates of the general purpose tray are used as a method of controlling the flow
rate of the sample by varying the aperture between them. The gates are locked in
position by the knurled locking screws.
On hopper instruments the sample tray has a one piece guillotine style gate con-
trolling the flow rate of the sample. To adjust this loosen the M3 Allen screws that
secure the gate then move the gate up or down to the desired position. Use a
1.5mm Allen key to adjust this, securing the screws afterwards.
Sieve
The ball bearings in the wire sieve at the entrance to the feed mechanism smooth
the flow of the sample as they effectively store the sample within the array for a
short period. The ball bearings also break up loose agglomerates in the sample.
One fine and one coarse sieve are provided with the dispersion unit.
Tray locking screw
The sample tray is locked in position by tightening the locking screw.
MAN0386-1.0 Scirocco 2000.book Page 6 Friday, March 16, 2007 4:15 PM
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