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Scanning Mobility Particle Sizer Spectrometer 3938

SKU: 3938L50

For more than 30 years, the TSI Scanning Mobility Particle Sizer (SMPS) spectrometers have helped gain new insights in aerosol research and assisted with calibrating reference material and other aerosol instrumentation. The US National Institute of Standards and Technology (NIST) and many other reference laboratories worldwide use the TSI SMPS for submicrometer particle size distribution measurements. Featuring a modular, component-based design, the third generation model 3938 SMPS features very high size resolution, fast scanning (<15 seconds per scan), and automatic component recognition. Easy to use, and providing the highest quality data available, the TSI SMPS spectrometer is the researcher's choice for nanoparticle size distribution measurements.

Product Details

The SMPS spectrometer is a nanoparticle sizer capable of measuring the size distribution of airborne submicron particles with accuracy and precision. It combines electrical mobility sizing with single-particle counting to deliver nanoparticle concentrations in discrete size channels. The size resolution capability of the SMPS is as high as 128 channels per decade, resulting in up to 192 channels in total.

The SMPS Model 3938 is component-based, allowing users to customize their SMPS to match their experimental needs. Users may choose among three DMAs, seven CPCs, and two different neutralization techniques, enabling measurement from 1 nm - 1 um. When an SMPS is coupled with an Optical Particle Sizer (OPS) or Aerodynamic Particle Sizer (APS), the continuous measurement range can be extended up to 10 µm or 20 µm, respectively.


  • Nanotechnology research and materials synthesis
  • Atmospheric studies and environmental monitoring
  • Combustion and engine exhaust studies
  • Indoor air quality measurements
  • Nucleation/condensation studies
  • Inhalation toxicology studies

Features and benefits

  • High resolution data: up to 192 channels
  • Broad size range: from 1 nm to 1,000 nm
  • ISO 15900:2009 compliant
  • Fast measurements: <15 second scans
  • Wide concentration range up 107 particles/cm3
  • Modular component design for maximum flexibility
  • Touch-screen control for stand-alone operation (no computer needed)
  • Easy setup with tool-less installation and auto discovery of components 
  • Discreet particle measurement: works well for multi-mode samples
  • Independent of optical properties of the particles and fluid
  • Wide range of system options: choice of water or butanol CPC; choice of traditional or nonradioactive neutralizer

Included Items

  • Electrostatic Classifier with your choice of DMA column
  • One of seven CPCs
  • Aerosol Instrument Manager® software

Computers for data collection must be purchased separately.

Related Resources

  • Application Notes
  • Bibliography
  • Brochures
  • Catalogs
  • Manuals
  • Spec Sheets

Application Notes