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Particle Size

Particle Size Instruments

There are numerous ways to measure the size, quantity, and distribution of particles. Selecting the right measuring technique is critical for obtaining reliable data – but no single technique is accurate for all materials or applications. For this reason, Micromeritics offers six types of particle size analyzers, each employing different analytical techniques to accurately characterize particles across a variety of application types. Browse our catalog of PSD analyzers below to learn more about their capabilities and how they work.

Techniques and Solutions for Particle Size Characterization:

Zetasizer Product Range

Zetasizer Dynamic Light Scattering (DLS) & Zeta Potential PSD Analyzers

Instruments in the Zetasizer range are used to analyze particle size from less than a nanometer to several microns using dynamic light scattering; zeta potential and electrophoretic mobility using electrophoretic light scattering; and molecular weight using static light scattering.

  • Several models are available, including the Zetasizer Nano ZS, which can measure the zeta potential of samples with little or no dilution in a high concentration cell.
  • Unique capabilities including MADLS®, Particle Concentration, Microrheology and other techniques only availabl with Zetasizer systems
  • User friendly interface allows for unprecedented ease of use and flexibility with novel particle characterization techniques
  • Compatible with a wide variety of cells, cuvettes and accessories.
Elzone II

The Electrical Sensing Zone

The electrical sensing zone (ESZ) technique, which relies on the Coulter principle, analyzes samples particle by particle. Requiring only a small volume of sample for analysis, it provides the highest particle size measurement resolution of the techniques presented here.

A homogeneously dispersed suspension of sample material is prepared in an electrolytic solution. A tube with a small orifice of short path length is submerged in the suspension with electrodes positioned on both sides of the orifice. A pump moves the liquid electrolyte and suspended particles through the orifice. The particles, having lower conductivity than the electrolyte, impede the current flowing between the electrodes as they pass through the ESZ at the orifice. This generates an electrical signal proportional to the volume of the particle. Each individual particle is counted and classified according to volume to define the sample’s volume frequency distribution of particles.

Unlike other particle characterization techniques, the electrical sensing zone method can analyze samples that have various optical properties, densities, colors, and shapes. The Elzone II can determine the size, number, concentration, and mass of innumerable organic and inorganic materials.

  • Sizes and counts both organic and inorganic materials from 0.4 to 266 µm
  • Different conductive liquids can be used without needing to enter an extensive set of liquid properties
  • Does not require previous knowledge of material density, refractive index, or other properties
  • Automated features include: start-up, run, and shut-down routines; blockage detection and clearing; flushing/rinsing; and calibration
  • A CCD camera provides real-time video display of the aperture to assure a clear path through the detection zone
Sedigraph III Plus

X-Ray Sedimentation

Sedimentation velocity of suspended particles can be determined by measuring the concentration of particles remaining in suspension over time. This technique measures the distribution of equilibrium velocities of particles settling through a liquid under the influence of gravity. Stokes’ law relates these velocities to particle diameters for spherical particles. Non-spherical particles are measured in terms of the diameter of a sphere of the same material that settles at the same velocity in the same suspension liquid.

SediGraph III Plus

The SediGraph III Plus (pictured) PSD analyzer combines the proven SediGraph analytical technique with advanced instrumentation features to provide superior repeatability, accuracy, and reproducibility. The SediGraph III directly measures mass by x-ray absorption and determines particle size by direct measurement of settling velocity. Direct measurements require no modeling.

  • Particle size range of 0.1 to 300 µm
  • Complete particle accountability
  • Features Y year warranty on the x-ray tube
  • Optional MasterTech 052 autosampler provides unattended analysis of up to 18 samples

DIA Particle Sizer Analyzers

Particles are suspended homogeneously in a carrier liquid. They pass through a thin flow cell in the optical path. Light is transmitted through the flow cell, thus projecting silhouettes of the particles onto a high-resolution camera sensor. The high frame rate and high resolution of the camera combined with a high-speed host computer enables the characterization of thousands of particles per second in real-time. This technique is ideal for applications where shape, not just diameter, is critical information for predicting raw material performance.

The SentinelPro is a class-leading dynamic image analyzer that is ideal for applications where particle shape, not just the particle size, may be critical information for predicting raw material quality and to maintain a high level of process control.

Particle morphology provides important information regarding the physical shape properties of your sample. It has been shown that shape can affect flowability, dispersion, packing density, segregation, aggregate formation, and microstructure character.

Micromeritics SAS Subsieve Autosizer II

Particle Size Analyzers for Powdered Materials

The particle size, or fineness, of powdered materials can be determined by measuring the powder's air permeability. When a homogenized bed of powder with a known porosity and has its height changed in a test tube, its porosity also changes. Using this principle, average surface area and particle size can be determined as a function of pressure drop and airflow rate in accordance with the Kozeny-Carman equation.

The Micromeritics Subsieve AutoSizer (SAS) II is a modernized and improved version of the discontinued Fisher Model 95 Sub-Sieve Sizer (FSSS). The SAS has drastically improved on the air-permeability particle sizing technique.

  • Measures particle size in a range of 0.2 - 75 µm
  • Designed to generate “Fisher number” results for easy comparison to historical data and quality control standards.
  • Simple set-up and real time data display.
  • Powder compaction and pressure stabilization are fully automated for high repeatability.
Saturn DigiSizer II

Static Light Scattering PSD Analyzers

The size of particles can be determined from the manner in which they scatter light. However, variations in the intensity and/or angle of the light source can yield different results. Hence, precise measurement and control of the light’s characteristics is fundamental to obtaining good particle size data.

The Saturn DigiSizer II (pictured) is a state-of-the-art particle size analyzer that utilizes laser light, advanced optics, CCD technology, and more than 3 million detector elements to maximize sensitivity and deliver high- resolution measurement of articulations in the scattering pattern. This allows for an extreme degree of size discrimination in the sample and reveals characteristics about the material that go undetected by other laser-based particle sizing systems.

Saturn DigiSizer II
  • CCD technology with high angular resolution of up to 70 degrees provides accurate results with even the most complex sample types. Particle Size range: 40 nanometers to 2.5 millimeters.
  • Fast, detailed results that are repeatable on and reproducible between every model of Saturn DigiSizers.
  • Liquid sample handling unit for automatic sampling, diluting, and dispersion. Available in both standard and low volume configurations.