Software features Chapter 3
Scirocco 2000 Page 3-9
Hopper Feed Rate (hopper instruments only)
The hopper is a pre-disperser. Its purpose is to deliver a steady amount of powder
to the sample tray, so that the amount of powder passing through the venturi
remains roughly constant. This prevents any surging in obscuration, and any poor
dispersion caused by passing too much material through the venturi system.
Aim to set a rate that delivers a steady amount of powder:
1. Initially set the Vibration Feed Rate to an appropriate value (around 30%).
2. Change the Hopper Feed Rate until enough material to produce a steady line
of powder is passed down the tray. This is then the rate to use in an SOP.
Approximate starting Hopper Feed Rates are 40% to 45% for a materials such as
cement, but every product is different so the appropriate SOP settings for specific
products may differ.
MAN0386-1.0 Scirocco 2000.book Page 9 Friday, March 16, 2007 4:15 PM
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