Particle Size with a Bahco Centrifugal Classifier

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Bulk samples can be analyzed using a Bahco™ Centrifugal Classifier. When true particle density corrections are used, this method yields the most accurate and reliable results in a size range between 1 and 30 micrometers. It is therefore the preferred method of analysis within the pollution control industry.

The instrument is a combination air centrifuge-elutriator consisting of a rotor assembly driven by a totally enclosed electrical motor. The rotor is enclosed in a housing which also supports the sample feed mechanism. The motor operates at 3500 rpm creating precisely controlled air velocities within the air spiral and sifting chamber of the centrifuge.

The sample is introduced into a spiral shaped air current flowing toward the center. The spiral current of air has suitable values of tangential and radial velocities so that a certain part of the sample is accelerated by the centrifugal force toward the periphery of the whirl, the other part of the sample is being carried by the air current toward the center of the whirl by aerodynamic means. The size, shape, and weight of the particles determines which direction they will take in the air current. By varying the air flow, it is possible to change the terminal velocity limit of division and thus the material can be divided into a number of fractions with limited terminal velocity ranges.

This method has many advantages over other laboratory methods. The classified sample can be recovered in whole from the instrument following analysis. The instrument applies the principle of terminal settling velocity to determine particle size distribution. Thus, Stokesian diameters are reported. See a graph of a particle size distribution using a Bahco and a sieve in our informational report on resistivity and particle size.

This method requires a bulk sample (greater than 10 g) for analysis. In cases where low grain loadings exist, acquiring a bulk sample can be impossible. Other methods are usually suggested in these cases.

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Related Links

Bahco Particle Size

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Particulate Bulk Resistivity

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Sieve Particle Size

 

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