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Average particle size analyzer Fisher sub sieve sizer manufacturer Magnetic powder size measuring

Average particle size analyzer Fisher sub sieve sizer manufacturer Magnetic powder size measuring

Average particle size analyzer (Fisher Sub-Sieve Sizer) is an apparatus using a gas-permeability method for determination of the average particle diameter of powders. Particle size operates on air permeability principle. Results is read directly from multi-curve chart on front of instrument after simple alignment of indices. Complex calculations are ignored to get the result. A sample, equal in weight (grams) to the true density of the material, is compacted between two porous plugs in a metal tube, to a known porosity. Air or a suitable gas, under a constant pressure head, is passed through the compressed sample, and rate of flow is measured by a calibrated flowmeter. The average particle diameter of the powder is indicated directly on a self-calculating chart by the liquid height in one arm of the flowmeter tube. No dispersion is required, and the results are unaffected by particle shape.

This apparatus is developed according to the theory of air permeance that could fast measure average diameter of the powder & grain. People often call it Fisher sizer or Fisher sub-sieve sizer. It is an absolutely necessary measuring device of magnetic material, powder metallurgy, hard-fusing metal, special type porcelain, tungsten and molybdenum material, hard alloy, coloured meal, nonmetal, chemistry, building material, special material for national defence and the research and production of powder. Its main characteristics are as following:

Its performance is very stable, easy to operate and having good repeatability. The pump is specially selected Fisher pump which produced by hard wearing-off metal. It has no noise when works and the pressure are far more stable, so that extends the life span of the apparatus.

In this apparatus, the range of porosity is expanded from primary 0.4-0.80 to 0.25-0.40, 0.40-0.80, 0.80-0.95, so satisfying different requirements from different kinds of measurement of powder industries.