Measuring and testing – Particle size
Patent
1988-12-06
1991-04-16
Raevis, Robert
Measuring and testing
Particle size
G01N 1500
Patent
active
050072978
ABSTRACT:
In a particle size measuring system with automatic dilution of the sample containing particles to be measured, the sample is diluted with ionized water in a mixing chamber while continuously withdrawing the mixture of the diluent and the sample in a stream from the mixing chamber. The size of the particles in the stream drawn from the mixing chamber are measured. To insure that the particle size distribution in the stream drawn to the mixing chamber is the same as that in the original sample, a stirrer is provided in the mixing chamber which repeatedly is reversed in its direction of rotation with the time intervals between successive reversals being randomly varied. A cleaning system is provided to clean the mixing chamber as well as the measuring cell in which particle sizes are measured.
REFERENCES:
patent: 3790760 (1974-02-01), Stiller
patent: 3854321 (1974-12-01), Dahneke
patent: 4199265 (1980-04-01), Sanderson et al.
patent: 4227815 (1980-10-01), Hoffa
patent: 4287757 (1981-09-01), Bucsky et al.
patent: 4779451 (1988-10-01), Ezawa et al.
patent: 4794806 (1989-01-01), Nicoli et al.
patent: 4842406 (1989-06-01), Von Bargen
Pacific Scientific Company
Raevis Robert
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