Title:
FILTERING EFFICIENCY MEASURING METHOD FOR FILTER
Document Type and Number:
Japanese Patent JP3206859
Kind Code:
B2
Abstract:
PURPOSE: To measure the filtering efficiency in a short time without requiring any microscopic observation by measuring the particle size distribution of a sample suspension before and after passing through a filter by means of a particle size distribution meter.
CONSTITUTION: A sample suspension 1 is placed in a tank A and fed at a constant rate to a filter 2 fixed to the holder of housing by means of a pump 3 and the sample suspension 4 passed through the filter 2 is collected in another tank B. The suspensions 1, 4 are sampled sequentially through sampling cocks 5, 6 and respective sample liquids S are measured by means of a scattering particle size meter disposed at a measuring section M. Filtering efficiency E(d) of the filter 2 is determined according to a formula; E(d)={Fo(d)[Lo(da)/Lf(da)].- Ff(d)}/Fo(d) using the measured particle size distribution data Fo(d), Ff(d) of the suspensions 1, 4 and the accumulated distribution value Lo(da), Lf(da) of particle size Da before and after passing through the filter.
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Inventors:
Tatsuo Igushi
Application Number:
JP21788394A
Publication Date:
September 10, 2001
Filing Date:
August 20, 1994
Export Citation:
Assignee:
HORIBA, Ltd.
International Classes:
G01N15/02; G01N15/08; (IPC1-7): G01N15/08
Domestic Patent References:
| JP6015543A | ||||
| JP59163540A |
Attorney, Agent or Firm:
Hideo Fujimoto