The new SediGraph™ III 5120

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 1 August 2004




(2004), "The new SediGraph™ III 5120", Pigment & Resin Technology, Vol. 33 No. 4.



Emerald Group Publishing Limited

Copyright © 2004, Emerald Group Publishing Limited

The new SediGraph™ III 5120

The new SediGraph™ III 5120

Keywords: Sedimentation, Particle size measurement, Instruments

The new SediGraph™ III 5120 determines particle size by using the highly accurate and reproducible sedimentation technique which measures the gravity-induced settling rates of different size particles in a liquid with known properties.

This is simple, yet an extremely effective technique for providing particle size information for a wide variety of materials:

 measures particles ranging from 300 to 0.10 μm equivalent spherical diameter;  utilizes a modern pumping system that is silent, reliable, and easy to maintain;  a maintenance reminder, based on the number of analyses performed, alerts you when it is time for routine maintenance;  computer – controlled mixing chamber temperature improves repeatability and reproducibility;  a highly versatile and interactive reporting system provides a wide range of custom data presentation options including dynamic reformatting of plots and cut-and-paste graphics and tables;  particle settling velocity is reported as graphical and tabular data;  grain size can be reported in Phi units;  provides SPC reporting and regression analyses;  runs up to 18 samples unattended using the MasterTech 052 Autosampler, which sits securely on top of the SediGraph to conserve bench space; and  completes most analyses in 15 min or less.

Key features

Complete particle accountability assures that all of the introduced sample is accounted for, including fractions below 0.1 μm.

Capability to merge data with that from other particle sizing methods, thus extending the range of reported data to 125,000 μm (125 mm), excellent for geological applications.

Scanning the sedimentation cell from bottom to top allows accurate inventory of fast-settling particles while minimizing the time required to resolve the separation of fine particles.

Fully automatic operation increases sample throughput and reduces operator involvement in addition to reducing the opportunity for human error.

Temperature-controlled analyses assure that liquid properties remain constant throughout the analysis, so you can be confident of accurate and reproducible results.

Multiple analysis speeds allow you to choose the desired combination of speed and resolution that meets your needs.

Real time display allows you to monitor the cumulative mass plot of the current analysis and to make immediate procedural changes if needed.

Statistical process control (SPC) reports track the performance of your processes allowing immediate response to fluctuations.

Plot overlays provide a visual comparison of analysis results from one or more analyses; a reference or baseline analysis, for example, or a superposition of two different types of plots of the same analysis data.

Data comparison plots provide graphical displays of the mathematical difference between the two data sets (difference from reference plot) or the extent of a data point value above or below a tolerance boundary (out of specification plot).

Multiple analyzer control allows two SediGraph III's to be operated simultaneously from a single computer, conserving valuable lab space and making data storage convenient.

Data reporting detailed analysis of data for particles ranging from 300 to 0.1 μm are provided automatically by the SediGraph III. Data collected from other particle size analyses ranging from 125,000 to 300 μm can be combined with SediGraph data, enabling effective reporting for particles ranging from 125,000 to 0.1 μm. That fraction finer than 0.1 μm is also indicated. In addition to tabular data, different graphical analysis plot types are available including:

 cumulative mass, area, and number;  distribution of sample quantity as a function of settling velocity;  process control charts;  log probability;  baseline/full-scale references;  frequency distribution;  difference from reference;  out of specification;  Rosin-Rammler plots; and  regression analyses.

Plots can be overlaid for comparing the results from different samples or for comparing different plot types from the same sample. This allows to compare analysis results to a standard. Plots can be rescaled to give you the ability to scrutinize closely your graphical data.

A new column has been added to the tables and to the x-axis selection in the graphs that reports size in Phi units, where Φ = – log2 (particle diameter in mm). Also, a column selection for settling velocity (cm/s) is available for tables. The x-axis of plots can be scaled in particle size or settling velocity. The SediGraph is the only automated particle sizing instrument that directly measures settling velocity.

For further information visit the Web

Related articles