Measuring and testing – Particle size
Patent
1986-10-24
1988-05-10
Levy, Stewart J.
Measuring and testing
Particle size
G01N 1502
Patent
active
047427183
ABSTRACT:
An apparatus for measuring particle-size distribution which is constructed by arranging a measuring cell or cells in vertical direction, i.e. their longitudinal directions in alignment with the direction of the gravity, or mounting a measuring cell or cells on a rotor rotatable in a horizontal plane so that their longitudinal directions are in alignment with the radial directions as that of centrifugal force; inserting tips of a couple of pressure transmitting tubes having lengths different between them into each of said measuring cells; and securing base ends of said pressure transmitting tubes to a pressure-detecting unit. To operate this apparatus, a suspension of a powder to be measured is introduced into said measuring cell, particles of suspension in the measuring cell is made to settle by the gravity or a centrifugal force, the amount of powder between the tips of pressure transmitting tubes of said couple is determined by measuring the pressure difference between said tips, and the particle-size distribution is determined on the basis of the obtained amount of powder and a particle size calculated by Stokes' law from the settling time elapsed.
REFERENCES:
patent: 1969081 (1934-08-01), Vogel-Jurgensen
patent: 3206983 (1965-09-01), Muschelknautz
patent: 3208286 (1965-09-01), Richard
patent: 3788146 (1974-01-01), Hartman
patent: 3896660 (1975-07-01), Valentyik
patent: 4175426 (1979-11-01), Rosenblum
patent: 4287757 (1981-09-01), Bucsky et al.
patent: 4307609 (1981-12-01), Rosenblum
Levy Stewart J.
Onoda Cement Company, Ltd.
Raevis Robert R.
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