The Brookhaven BI-DCP Disc Centrifuge Photosedimentometer (DCP) is a digitally controlled, high-resolution, particle size distribution analyzer. It yields high-resolution results in the size range from 0.01 to 30 microns with typical analysis times ranging from 5 to 30 minutes. The BI-DCP software provides easy instrument control, data analysis, and database management. The software is menu-driven and permits a variety of report formats.