201-31 What is air permeability method particle size analyzer?

201-31 What is air permeability method particle size analyzer?

Air permeability particle size analyzer is a lab instrument to determine particle size by air permeability through compacted powder layer. It is divided into two kinds: one is Fisher method. American Fisher Scientific is the first to develop it. The other is Blaine Apparatus.

HMK-22 Fisher Sub Sieve Sizer (P/N 20198)

Air permeability method is a nondestructive testing method for particle size of powder. This method is simple and has good repeatability and accuracy. How does this fisher method work? First of all, the steady air is pumped out by a steady pressure pump. After pressure regulation by pressure regulator tube, dry by drying tube. The dry gas passes through the compacted sample area, then creates a pressure drop. If the powder has a large gap, the pressure drop is small. If the powder has a small gap, the pressure drop is large. The other end is equipped with a U-shaped pressure manometer. The water level varies with the pressure drop. With a reading board, the particle size value of powder can be read directly on the chart.

The Fisher Model 95 Sub-Sizer 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.

Fisher sub sieve sizer and laser particle size analyzer are particle size analyzers widely used in the field of powder. The measurements results of both can be expressed in microns, but the results are not comparable. Investigate its reason, the working principles of both are different. For instruments with different working principles, there is no comparability, just like the differences before the unification of weights and measures. The fisher sub sieve sizer is operated according to the principle of air permeability method. In essence, it measures not the particles themselves, but the gaps between them. But this kind of clearance is also determined by the size of particles, large particles, large clearance, air through more. Small particles, small clearance, air through less. The working principle of laser particle size meter is scattering phenomenon of particles by laser. Large particles, small scattering angel, small particles, large scattering angle. The scattering signal is collected by detectors at different positions, so as to obtain the particle size distribution. The shape of particles has a great influence on the accuracy of measurement. The fisher sub sieve sizer requires each particle to be roughly round and close to an equal circle. The equivalent diameter is used in the laser particle size analyzer, that is, the particle is assumed to be round. But the more irregular the particle shape is, the less accurate the measurement is. As for the application scope of the two. In some specific fields, such as magnetic materials, cemented carbide, powder metallurgy, pharmacy, etc. Fisher sub sieve sizer is very widely used in many fields. For more information about the fisher sub sieve sizer please visit the HMKTest HMK-22 Fisher sub sieve sizer.

Fisher Sub Sieve Sizer https://www.labulk.com/hmk-22-fisher-sub-sieve-sizer/