Title:
粒子状汚染物の評価
Document Type and Number:
Japanese Patent JP4067568
Kind Code:
B2
Abstract:
A component is washed with a fluid to release particulate contaminant. The particulate-containing fluid is passed through a screen (22) having a known number of apertures of identical known size. The change in pressure caused by the accumulation of particles in the screen is measured and compared with the pressure when the screen is clean. From this, a control system (54) determines the number of particles in the fluid having a size greater than the aperture size. This is related to a unit volume by measuring the volume of fluid passing through the screen (22). If the screen blocks before all the fluid is passed through the screen (22), the fluid is pulsed in forward and reverse flow to re-distribute the particles on the screen. The fluid is then back washed from the screen to a second screen (28) having a known number of apertures of identical size. The number of particles per unit volume having a size greater than the size of the apertures of the second screen is then determined. If the second screen (28) blocks, the second screen (28) is pulsed and the fluid back washed to a third screen (32) having a known number of apertures of identical size. The number of particles per unit volume having a size greater than the size of the third screen (38) is then determined. These values are displayed by the control system (54).
Inventors:
Ian Burniston
Application Number:
JP50859598A
Publication Date:
March 26, 2008
Filing Date:
July 23, 1997
Export Citation:
Assignee:
Pall Corporation
International Classes:
G01N7/00; G01N15/06
Domestic Patent References:
| JP59501680A | ||||
| JP63032365A | ||||
| JP6507240A | ||||
| JP62067428A | ||||
| JP2223846A |
Attorney, Agent or Firm:
Yuichi Yamada
Masakazu Noda
Ikeda adult
Masakazu Noda
Ikeda adult
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