Overview
HMK-22 Fisher Sub-Sieve Sizer/Average Particle Size Analyzer (FSSS) uses air permeability to fast determine the average particle size i.e. fisher number of powders. It complete meets international standard about fisher sub sieve sizer ISO 10070 Metallic powders Determination of envelope-specific surface area from the measurements of the permeability to air of a powder bed under steady-state flow conditions and ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds. HMK-22 Fisher Sub Sieve Sizer is a necessary testing method in productions and research fields such as magnetic materials, powder metallurgy, refractory metal, special ceramics, tungsten materials, hard metal, nonferrous metal, nonmetal, chemical industries, building materials, national defense function material, etc and has become the most reliable and cost-effective fisher sub sieve sizer.

Technologies
-ISO 10070 Metallic powders Determination of envelope-specific surface area from measurements of the permeability to air of a powder bed under steady-state flow conditions
-ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds

Specifications
Voltage Requirement: 220V/115V (+ or -10%), 50-60 Hz
Power Requirement: 0.3amps (30 Watts)
Range
-Average Particle Diameter: 0.2 to 50 microns (um)
-Porosity: 0.40 to 0.80
Repeatability:<3%
Accuracy: <3%
Test Method: Air permeability
Shipping Weight: 18kg (38 lb.)
Instrument Dimensions: 41.8cm W x 24.6cm D x 73.7cm H

Features
-Stable performance
-User-friendly operation
-Good repeatability
-Fisher pump made of wear-resistant metal
-Working in stable pressure without any noise
-Long working time
-Specific surface area is also an output
-Extended porosity range

Manufacturer
-AimSizer is one of the world leading manufacturer of Fisher Sub Sieve Sizer/Average Particle Size Analyzers
-HMK-22 Fisher Sub-Sieve Sizer meets ASTM and ISO International Standards about fisher sub size sizer/average particle size anayzer.

Frequently Asked Questions
18. What are particular attentions when using fisher sub sieve sizer according to ASTM B330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-The manufacturer also furnishes directions which should be followed except as amended as follows.Particular attention should be given to proper manintenance of the instrument with special reference to the instructions on (1) periodic checking of water level in the pressure regulator standpipe,(2) manometer level before the sample tube is inserted, and (3) the sample packing assembly.

17. Where to buy replacement parts of fisher sub sieve sizer/average particle size analyzer recommended by ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-Necessary replacement parts should be obtained from the manufacturer, that is AimSizer Scientific Ltd. especially in the case of the precision manometer which is a part of the air flowmeter.

16. What are apparatus of a fisher sub sieve sizer/average particle size analyzer according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-The fisher sub sieve sizer consists of an air pump,an air-pressure regulating device,a precision-bore sample tube,a standardized double-range air flowmeter,and a calculator chart.Included is accessory equipment consisting of a plug manipulator,powder funnel,two porous plugs,a supply of paper disks,and a rubble tube support stand.

15. How to fairly evaluate the test report of fisher number using a fisher sub sieve sizer according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-When an "average" particle size of powders is determined using the Fisher sub-=sieve sizer,it should be clearly kept in mind that this average size is derived from the determination of the specific surface area of the powder using a relationship that is true only for powders of uniform size and spherical shape.

14. What is the application of a fisher sub sieve sizer according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-This test method is generally applicable to all metal powders and related compounds,including carbides,nitrides,and oxides,for particles having diameters between 0.5 and 50 micrometer. It should not be used for powders composed of particles whose shape is too far from equiaxed,that is,flakes or fibers.In these cases,it is permissible to use the test method described only by agreement between the parties concerned. This test method shall not be used for mixtures of different powders nor for powders containing binders or lubricants. When the powder contains agglomerates, the measured surface area may be affected by the degree of agglomeration. Methods of de-agglomeration such as that referenced in 1.1 in ASTM B 330 may be used if agreed upon between the particles concerned.

13. What requirement on particles to be tested by a fisher sub siever sizer according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-This test method provides a procedure for determining the envelope-specific surface area of powders, from which is calculated an "average" particle diameter,assuming the particles are monosize,smooth surface,nonporous,spherical particles.For this reason,values obtained by this test method will be defined as a fisher number. The degree of correlation between the results of this test method and the quantity of powders in use will vary with each particular application and has not been fully determined.

12. What is agglomerate according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds using a fisher sub sieve sizer?
-The agglomerate means several particles adhering together.

11. What is porosity of a bed of powder according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds using a fisher sub sieve sizer?
-Porosity of a bed of powder means the ratio of the volume of the void space in the powder bed to the that of the overal volume of the powder bed.

10. What is fisher calibrator tube according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds using a fisher sub sieve sizer/average particle size analyzer?
-Fisher calibrator tube is a jewel with a precision orifice mounted in a tube similar to a sample tube. The calibrator tube value is directly traceable to the master tube maintained by Fisher.

9. What is Fisher Number according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds using a fisher sub sieve sizer/average particle size analyzer?
-Fisher number a calculated value equated to an average particle diameter, assuming all the particles are spherical and of uniform size.

8. What is de-agglomeration according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds using a fisher sub sieve sizer/average particle size analyzer?
-De-agglomeration is process used to break up agglomerates of particles.

7. What is air permeability according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds using a fisher sub sieve sizer/average particle size analyzer?
-Air permeability is measurement of air pressure drop across a packed bed of powder.

6. What is envelope specific surface area according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds using a fisher sub sieve sizer/average particle size analyzer?
-Envelope-specific surface area is specific surface area of a powder as determined by gas permeametry in according with ISO/DIS 10070 Metallic powders Determination of envelope-specific surface area from measurements of the permeability to air of a powder bed under steady-state flow conditions.

5. What is a fisher sub sieve sizer according to ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-Fisher sub sieve sizer is also named average particle size analyzer, it is a commercially available permeability instrument for measuring envelope-specific surface area.

4. What are referenced Documents of ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds concerning fisher sub sieve sizer or average particle size analyzer?
-B 243 Terminology of Powder Metallurgy
-B 859 Practice for De-Agglomeration of Refractory Metal Powders and Their Compounds Prior to Particle Size Analysis
-E 456 Terminology Relating to Quality and Statistics
-E 691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
-ISO/DIS 10070 Metallic Powders: Determinations of Envelope-Specific Surface Area from Measurements of the Permeability to Air of a Powder Bed Under Steady-State Flow Conditions

3. What is the scope of ASTM B 330 Standard Test Method for Fisher Number of Metal Powders and Related Compounds?
-This test method uses air permeability to determine an envelope-specific surface area and its associated average equivalent spherical diameter (from 0.5 to 50 um) of metal powders and related compounds. The powders may be analyzed in their "as-supplied" (shipped, received, or processed) condition or after they have been de-agglomerated or milled by a laboratory procedure ("lab milled") such as that specified in Practice B 859. The values obtained are not intended to be absolute but are generally useful on a relative basis for control purposes.

2. What is the authoritative international standards about fisher sub sieve sizer/average particle size analyzer?
-The American Society for Testing and Materials (ASTM) has a standard test method for using fisher sub-sieve sizer/average particle size analyzer, B-330. It is entitled "Average particle size of powders of refractory metals and compounds by the Fisher Sub-Sieve Sizer." The International Organization for Standardization (ISO) also has a standard pertaining to the use of fisher sub sieve sizer/average particle size analyzer, ISO/TC 119/SC2, ISO 10070 Metallic powders Determination of envelope-specific surface area from measurements of the permeability to air of a powder bed under steady-state flow conditions.

1. What is the size range and how to read average size on AimSizer Fisher Sub-Sieve Sizer/Average Particle Size Analyzer HMK-22?
-The HMK-22 Fisher Sub-Sieve Sizer/Average Particle Size Analyzer is designed for quick and reproducible measurements of average particle diameters in the 0.2 to 50 micron range. Each measurement is read directly from a curve on the calculator chart located at the top half of the instrument.

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