800-680-1220 / +1 651-490-2860 (US) All Locations

General Scanning Mobility Particle Sizer (SMPS) 3938

SKU: 3938L89

Choose your configuration of the global standard in aerosol size measurement. 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 other 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. The TSI SMPS™ is the researcher's choice for nanoparticle size distribution measurements.

Featuring a modular, component-based design, the General Scanning Mobility Particle Sizer SMPS allows you to choose the components you need to achieve your particle size measurement goals. This third-generation model features very high size resolution, fast scanning (<15 seconds per scan), and automatic component recognition. All configurations are easy to use, and provide the highest quality data available.

Product Details

The Scanning Mobility Particle Sizer (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 384 channels in total.

The SMPS™ 3938 is component-based, allowing users to customize their SMPS to match their experimental needs. Users may choose among four Differential Mobilty Analyzers (DMAs), six Condensation Particle Counters (CPCs), and two different neutralization techniques, enabling measurement in the range from 1 nm up to 1 µm. 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.


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

Features and Benefits

  • High resolution data: 128 channels/decade of resolution for up to 384 total possible 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-free installation and auto-detection of components 
  • Discrete particle measurement: works well for multi-mode samples
  • Particle size measurement is 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 six CPCs
  • Aerosol Instrument Manager® software

Aerosol neutralizer and computer for data collection must be purchased separately.

Related Resources

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

Application Notes


Service, calibration, and repair options

There are two levels of service to consider based on your needs: Clean and Calibrate, and Repair, Clean and Calibrate. As every instrument model is unique, please refer to the model-specific service option cards below for details on what each package includes:

Learn more about TSI particle instrument services

Preventative Maintenance Guide