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The Bettersizer ST is a fully automatic, reliable and compact measuring device for determining particle size distribution based on established laser diffraction technology with wet dispersion in the 0.1 – 1000 µm range. It is ideally suited for standard measurements in the micrometer range for samples that can be dispersed/prepared in aqueous media and is also characterized by very simple operation on both the software and hardware side.
Using the patented DLOS setup of the optical bench (Dual Lense Optical System) – a technology based on the Fourier setup combined with a second lens in the backscattering direction, a single-laser system and high detector density – an almost continuous scattering angle range of 0.031 – 159° can be covered. This enables precise particle size determination from 0.1 – 1000 µm.
The Bettersizer ST offers integrated wet dispersion designed for aqueous media with adjustable ultrasound up to 50W power and centrifugal pump. Thanks to the option of SOP-based measurement (Standard Operation Procedure) in conjunction with the automatic laser centering function, measurements can be automated during use and carried out very easily and with maximum reproducibility. The evaluation is easily possible according to both Mie and Fraunhofer theory.
* The measuring range depends on the sample.
/1/ ISO 13320 Particle size analysis – Laser diffraction methods
 Ceramic masses and powders |  Abrasives |  Silica |
 Color pigments |  Powder coatings |
 Fertilizers |  Graphite, Carbon |
 Iron oxide |  Clay, Kaolinite |  Limestone |
| General | |
| Application | Suspensions, Emulsions, Powders |
| Measurement principle | Laser diffraction, DLOS-Technology1 |
| Analysis | Mie- and Fraunhofer-Theory |
| Typical measurement time | < 10 s |
| Dimensions (L X T X H) | 660 X 420 X 320 mm |
| Weight | 38 kg |
| Power supply | AC 100-240 V, 50/60 Hz |
| Optical bank | |
| Light source | 1 X Semiconductor fiber optic laser / 635 nm/ 3 mW/ Class 1 |
| Lens arrangement | DLOS-Technology1, 2 F-Theta lenses before and after measurement cell |
| Effektive Brennweite | 223 nm |
| Detectors | 86 Photodetektoren, logarithmische Anordnung |
| Measurement angle | 0.031 – 159° (forwards, sidewards and backwards) |
| Measurement parameters and device performance | |
| Particle size range | 0,1 – 1000 µm |
| Number of size classes | £ 100 (adjustable) |
| Accuracy | ≤1% (NIST certified standard) |
| Repeatability | ≤1% (NIST certified standard) |
| Dipersion unit | |
| Type | Integrated wet dispersion unit with centrifugal pump |
| Ultrasonic power | £ 50 W (adjustable) |
| Pump speed | 300 – 2500 r/min |
| Max. flow rate | 3000 – 8000 mL/min |
| Software | |
| Software conformity | 21 CFR Part 11, ISO 13320, CE |
| Reports and data export | Individually customizable reports, export as TXT, Excel or PDF file |
| Computer configuration (recommended) | |
| Computer interface | Min. 1 X high-speed USB 2.0 or USB 3.0 port |
| Operating system | Windows 7 or higher |
| Hardware specification | Intel Core I5, 4GB RAM, 250GB HD |
| 1 Dual Lense Optical System | |
