Patent ID: 6829955
Filing Date: 2004-12-14
Classification: G01N

Abstract:
A particle size analysis apparatus (1) comprising:an oscillatory assembly comprising (a) a receptacle (3) for receiving a powder sample, the receptacle having an opening defined therein, (b) entry means (2) for introducing a powder sample into the receptacle, (c) adjuster means (6, 7, 11, 12, 13) for varying the size of the opening, (d) support means (6, 8) for supporting the receptacle, (e) bias means (19) operable to urge the oscillatory assembly towards a datum position; and drive means (17, 18) for inducing oscillations of the oscillatory assembly so as to cause a portion of the powder sample to exit from the receptacle through the opening; characterised in that the oscillations of the oscillatory assembly comprise rotary movements about a pivot axis (23) spaced from the receptacle, and in that the apparatus comprises sensor means (21, 204, 227) for producing a signal indicative of the weight or mass of a powder sample in the receptacle.