BI-XDC Particle Size Analyzer

By providing both centrifugal and gravitational sedimentation in one instrument the BI-XDC brings these well established methods of particle sizing up to date for today’s fine particle technology.

High Resolution Particle Size Analysis

The BI-XDC has been discontinued and is no longer available. Support is available for customers that currently own a BI-XDC. For any service and support inquires please contact us.

To see our other products, please check our Particle Characterization page.

NOTE: The Brookhaven BI-DCP is available, which 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.


Features at a glance

  • Accurate and quantitative
  • Resolves mixtures
  • X-ray detection – no optical corrections
  • Range 10 nm to 100 µm
  • Scanning head for high speed
  • Simple operation
  • Clear text and graphical reports

Measurement Principles

Qext is a strong function of the particle size but it is not easy to calculate accurately for high density particles. The key difference is the use of µabs which is the x-ray absorption efficiency instead of Qext. It is not a function of particle size or refractive indices. There is no optical correction. Notice that the decay function includes µabs. At time 0, there is 100% absorption and therefore no signal. As time progresses and absorption declines the signal is generated and produces a cumulative size distribution.

  • It = Io×exp(-µabs×c×L)             Io, It = Transmitted, Incident Intensity
  • µabs = X-ray absorption efficiency ≠ f(dp, np/nf, λ)
  • c = Mass concentration
  • L = Path length (width of fluid segment in disc)

When X-rays are absorbed, they are absorbed in proportion to mass without any dependence on particle size or refractive indices. There is no optical correction. For high density materials with normally high refractive indexes, the mass weighted size distribution is quantitative.

Read our article comparing our two disc centrifigues for more information.

Typical Applications

The versatile BI-XDC offers high resolution results to particle sizing problems where the particles are dispersed in a liquid and cover the size range from 0.01 to 30 microns. This range is useful for a variety of materials and many applications:

  • Abrasives
  • Inorganic pigments
  • Catalysts
  • Metal oxides
  • Cements
  • Metal powders
  • Ceramics
  • Minerals
  • Clays


Size Range0.01-100 microns, depends on particle and liquid density and liquid viscosity
Centrifuge Speed500-6000 rpm, +/-0.01%, high speed disc available see options
DiscPMMA construction, 10-30 mL volume, solvent resistant disc available see options
Scanning Speed0.05-10 mm/min, 1 mm/min typical
Measurement Time3-30 min, typically 8 min/decade in particle diameter,
Data SystemHigh-performance Windows™ system with color printer. Contact factory for latest specifications
SoftwareWritten for Windows™, control, archiving and data analysis,
Power Requirements100/115/240 VAC, 50/60 Hz, 300 Watts,
Dimensions230(H) x 460(W) x 600(D), mm
Weight35 kgs
CertificationsCE Marked

Options & Accessories

BI-DSCXR: Solvent Resistant Disc for use with many organic solvents.

BI-DSCXH: High speed disc (for use with aqueous dispersions), 10,000 rpm max

Download Brochure

BI-XDC Brochure PDF

Not sure where to start?

Our dedicated team of experts is standing by to help you find the right instruments for your testing needs.

Contact us today to see how we can help.