Dispersion of coarse dry particles by the gravity disperser GRADIS combined with the
vibratory feeder VIBRI/R inserted in the measuring zone of a HELOS/KF-MAGIC.

Technical specifications and dimensions.

This unit is ideal for products that don't need a high dispersing energy, like crystals, sand, granules etc. The fall shaft provides smooth dispersion and controls and equals the speed of the particles presented to the laser beam. GRADIS is fed by VIBRI, the software controlled feeding device for HELOS dry dispersing modules. The GRADIS is typically operated together with an extraction unit for the particle collection and the generation of the laminar air flow. If required, the sample can be collected and re-used after the analysis.

The GRADIS can be used with very coarse particles and sample quantities up to the kilogram regime. Two versions are available:

GRADIS:	This is the standard gravity disperser for free flowing samples up to the measuring range R6 (1750 µm). It can be used with HELOS/BF, all types of HELOS/K or HELOS/L sensors.
MEGAGRADIS:	This device integrates a forced vertical laminar air flow and can be used for samples up to measuring range R8 (8750 µm). It can be used with all HELOS/KF.

The fall shaft can be separated into two halves for cleaning purpose. For special applications fall shafts with PTFE coatings (conducting or non-conducting) are available as an option.