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Bettersize - Laser Particle Size and Particle Shape Analyzer - Bettersizer S3 Plus

Seamlessly combined laser diffraction and automated imaging in one model, Bettersizer S3 Plus particle size analyser not only achieves a wide size range from 0.01 to 3500μm, but also analyzes all size and shape parameters of a great variety of bulk materials. The reliable performance and user-friendly operation mode make Bettersizer S3 Plus the best choice for research in need of material characterization.

Bettersizer S3 vs Bettersizer S3 Plus

Model Bettersizer S3 Plus Bettersizer S3
Particle Size Measuring Range 0.01-3500μm 0.01-3500μm
Particle Shape Measuring Range 2-3500μm 100-3500μm
Measuring Method - Laser Diffraction: DLOIOS
- Automated Imaging: 0.5x lens and 10x lens
- Laser Diffraction: DLOIOS
- Automated Imaging: 0.5x lens
Dispersion System Wet Wet
Refractive Index Measurement Yes Yes

Technical specifications

Measuring principle Laser diffraction + Dynamic image analysis
Analysis theory Mie or Fraunhofer
Applications suspensions, emulsions, dry powders
Measuring range 0.01 - 3500 µm
Number of size classes >100 / individually customized
Typical measurement time <10 seconds
Accuracy error / Repeatability error / Reproducibility error <0.5% / <0.5% / <1.0% (GBRM D50)
Circulation / Dispersion / Volume Centrifugal pump / Ultrasound (50 W) / 600 ml
Laser: number / type / wavelength / power / class 1 / Laser diode (DPSSL) / 532 nm (green) / 5 mW / Class 1
Lens: design / arrangement F-Theta / Dual lens Fourier optics, oblique incidence
Effective focal length 223 mm, image analysis: 110 mm
Detector channels / Angle range 96 (forward, lateral, and backward) / 0.02° - 165°
Special features particle shape (L/D, circularity, etc.), refractive index
Conformity 21 CFR Part 11, ISO 13320, CE
Data export Excel, PDF, Word, JPG, etc.
Dimensions / Weight 820 x 650 x 320 mm (L x W x H) / 30 kg
Recommended operating system Windows 7 or higher, Intel Core i5, 4 GB RAM, USB 2.0

Key features

  • Measurement: Particle size and particle shape
  • Particle size from 0.01 to 3500µm
  • Particle shape from 2 to 3500µm
  • Dispersion type: Wet
  • Technology: Laser diffraction + Automated imaging
  • Automatic refractive index measurement
  • Precise measurement of small particles (from 10 nm) with patented dual lens technology: DLOIOS
  • Detection of large particles with imaging technology up to 3.5 mm
  • Easy to implement, create and use Standard Operation Procedures for new materials
  • Automatic alignment of the optical system
  • User-friendly software, easily learn
  • Innovative dual lens technology (DLOIOS)
    - Exact measurement of fine particles from 10 nm
    - Single laser technology for continuous scattering spectrum
  • Integrated camera technology
    - Higher accuracy of coarse particle measurement
    - Detection of individual large grains, agglomerates or air bubbles
  • Particle size and particle shape analysis is performed by one device

1. Bettersizer S3 Plus particle size analyzer overview

Bettersizer S3 Plus grain size test instrument is a laser diffraction particle size analyzer additionally equipped with two highspeed CCD cameras (0.5X and 10X magnification) to capture images of the sample being measured. 

During measurement, the particles dispersed in the medium of choice are pumped through two measuring cuvettes. In the first, short-wave laser light (532 nm) passes through the sample and is scattered depending on particle size. The 96 detectors detect optical signals in an angle range of 0.02° - 165°. 

The CCD cameras continuously take pictures through the second cuvette, to provide image analysis of particles in the range of 2 to 3500 µm.

2. Patented dual lens technology - DLOIOS
DLOIOS is a new technology patented by Bettersize based on the Fourier optical system. 

The additional lens between laser and sample cell (Lens 2) converts the divergent laser beam into a parallel beam and allows the detection of backscattered light. 

Using only one laser provides a continuous spread spectrum with a consistent wavelength, oblique light incidence and this special design enables detection in an angular range of 0.02° - 165°. DLOIOS technology guarantees reliable measurement of particles with a size range from10 nm to 3500 microns. 

CCD camera technology 

The optical imaging system of the Bettersizer S3 Plus grain size analysis instrument consists of 2 high-speed cameras and high-precision telecentric lenses, which make it possible to capture and evaluate more than 10,000 particles per minute without optical smearing. Both cameras can be used individually or simultaneously for observation of the sample for image analysis.

3. Laser diffraction method according to ISO 13320 
The particle size distribution of fine particles (nanometer, submicron and micron) is precisely determined with the DLOIOS technique. The wide scattered light measuring range (0.02° - 165°) is achieved together with its large number of detectors (96) .

The evaluation is based on Fraunhofer or Mie theory dependent on particle size and optical properties. 
Helpful tools for particle size measurement include the two cameras as a visual aid for checking dispersion efficiency and the refractive index measurement tool for materials with unknown optical parameters. 

4. Combined method: dynamic image analysis with laser diffraction

For samples with a large range in particle size and containing coarse particles, the combined measurement of laser diffraction with the 0.5X CCD camera is recommended. Bettersizer S3 Plus laser scattering particle size analyzer can even detect large particles less than 3% in the presence of a fine population.

5. Particle shape analysis 

Two high-speed CCD cameras with 0.5X and 10X magnification are available for particle shape analysis. They cover a particle size range of 2 - 3500 µm; particle shape analysis is used when the particle diameter is greater than 4 µm. During the measurement, particles are continuously photographed, evaluated and statistically classified at a rate of 10,000 particles/minute. The cameras can be used individually or in combination. 

In addition to the standard equivalent diameters (surface area, maximum (L) and minimum (D),), special parameters such as aspect ratio, Length/width D, circularity, roundness and particle perimeter are calculated.

6. Application of Bettersizer S3 Plus particle size analyzer

Bettersizer S3 Plus Particle Size Analyzer


Bettersize has become a significant player in the particle sizing business since 1995. We are a team of ~160 employees dedicated to share our expertise to satisfy your instrument and application requirements with reliable products and first-class services.


As the leading particle size analyzer manufacturer in China in terms of brand reputation, sales volume and most important quality, Bettersize spare no efforts on R&D each year. We offer a variety of products from basic to advanced research equipment, deliver precise analysis of materials from nanometer to millimeter, and assist scientists and engineers to understand material properties, facilitate research, and improve production efficiency.


Focused on technology innovation, product manufacturing, application research, and after sale service, Bettersize is making the particle size analyzer of China enter into the international advanced ranks.