Standard Practice for Comparing Particle Size in the Use of Alternative Types of Particle Counters

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

12-01-2019

Publisher

American Society for Testing and Materials

1.1This practice provides a procedure for comparing the sizes of nonspherical particles in a test sample determined with different types of automatic particle counters, which operate on different measuring principles.

1.2A scale factor is obtained by which, in the examination of a given powder, the size scale of one instrument may be multiplied to agree with the size scale of another.

1.3The practice considers rigid particles, free of fibers, of the kind used in studies of filtration, such as: commercially available test standards of quartz or alumina, or fly ash, or some powdered chemical reagent, such as iron oxide or calcium sulfate.

1.4Three kinds of automatic particle counters are considered:

1.4.1Image analyzers, which view stationary particles under the microscope and, in this practice, measure the longest end-to-end distance of an individual particle.

1.4.2Optical counters, which measure the area of a shadow cast by a particle as it passes by a window; and

1.4.3Electrical resistance counters, which measure the volume of a particle as it passes through an orifice in an electrically conductive liquid.

1.5This practice also considers the use of instruments that provide sedimentation analyses, which is to say provide measures of the particle mass distribution as a function of Stokes diameter. The practice provides a way to convert mass distribution into number distribution so that the meaning of Stokes diameter can be related to the diameter measured by the instruments in 1.4.

1.6The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Committee	D 19
DocumentType	Standard Practice
Pages	7
PublisherName	American Society for Testing and Materials
Status	Current
Supersedes	ASTM F 660 : 1983 : R2013

ASTM F 796 : 1988 : R1993	Standard Practice for Determining The Performance of a Filter Medium Employing a Single-Pass, Constant-Pressure, Liquid Test (Withdrawn 2002)
ASTM F 662 : 1986 : R1992 : EDT 1	Test Method for Measurement of Particle Count and Size Distribution in Batch Samples for Filter Evaluation Using an Electrical Resistance Particle Counter (Withdrawn 2001)
ASTM F 661 : 1992	Practice for Particle Count and Size Distribution Measurement in Batch Samples for Filter Evaluation Using an Optical Particle Counter (Withdrawn 2001)