Dispersion of coarse dry particles by the gravity disperser GRADIS/L combined with the
vibratory feeder VIBRI/L inserted in the measuring zone of a QICPIC image analysis sensor.

Technical specifications and dimensions.

This unit is ideal for products that do not 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/L is fed by VIBRI/L, the software controlled feeding device for QICPIC and HELOS dry dispersing modules. The GRADIS/L 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/L can be used for the analysis of very coarse particles and sample quantities up to the kilogram regime.

The width of the outlet slit of the fall shaft can be manually set to 2 mm, 4 mm or 10 mm. This is used for image analysis application to keep the particles within the working distance of the imaging objectives. For very fine particles a centering unit with outlets of 1 and 0.5 mm is available. Sympatec offers a fallshaft with 20 mm outlet for taking the maximum advantage of the measuring range.

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

GRADIS/L can be used with QICPIC, the HELOS/KF or HELOS-VARIO/KF family.

In combination with GRADIS for spherical particles from 0.5 bis 1.2 mm a particle counter is available as an option.