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Abstract

Apparatus for determining flowability of a powder by sensing powder avalanching includes a sample drum having a generally cylindrical sample chamber for holding a powder sample, a support frame including a drum shaft for supporting the sample drum for rotation, a drive motor and a drive mechanism coupled between the drive motor and the drum shaft such that the drum rotates when the drive motor is energized. The apparatus further includes an avalanche sensor for sensing avalanching of the powder sample within the sample chamber as the sample drum rotates. The avalanche sensor may be implemented as a backlash sensor for sensing intermittent reverse angular displacement of the sample drum caused by avalanching of the powder sample. A torque loading sensor may also be used to sense avalanching of the powder sample. A controlled gas may be circulated through the sample chamber by a gas conditioning system. The gas in the sample chamber can be measured and/or controlled. The apparatus may include a vibration mechanism for vibrating the sample drum.

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First Claim