AG300 CPS Instruments Automatic Gradient Builder

The CPS Instruments DC Series Disc Centrifuges separates particles by size using centrifugal sedimentation in a liquid medium. The sedimentation is stabilized by a slight density gradient within the liquid. The particles sediment through the density gradient inside a transparent rotating disc, through which a light beam passes. As particles move towards the outer edge of the disc, they pass through the light beam, attenuating the beam intensity. Detector beam attenuation is continuously recorded and converted by the operating software into the weight of particles at each size in the sample.

CPS Instruments Disc Centrifuge can be manufactured with disc inserts that make it possible to change the centrifuge speed during a measurement without disrupting (mixing) the liquid in the rotating disc. Speed can be increased during analysis from below 1,800 RPM to as high as 24,000RPM. This increases the practical dynamic size range (ratio of largest to smallest particles measured) to as much as 1,000 or more. Speed ramping reduces measurement times for very broad samples by a factor of up to 100 times.

The size range capability of CPS Instruments disc centrifuge is dependent on the density of the particles to be measured as well as the difference in density between the particles and the fluid.

The upper size capability for nearly all samples is approximately 50 microns. The lower size limit depends on the density of the particles. The higher the density of the particles, the smaller the lower size limit will be.