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Applied Physics, Inc.


Applied Physics, Inc.

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Aerosol Product Information

Scanning Mobility Particle Sizer

Model 1000XP-B

The Model 1000XP-B Scanning Mobility Particle Sizer (SMS) is a revolutionary instrument combining differential mobility analysis (DMA) and condensation particle counting (CPC) to automatically count and size aerosol particles from 10nm to 500nm (0.01um to 0.5um).


  • Atmospheric aerosol measurement
  • Indoor air quality studies
  • Laboratory aerosol research
  • Characterization of emission sources
  • Particle characterization for semiconductor, computer disk drive, and micro-contamination studies
  • Aerosol characterization for atomizers, nebulizers, and other aerosol generating devices used for aerosol drug delivery and medical applications.

SMS Features

  • Integrated Technology combining differential mobility analyzer (DMA) and condensation particle counter (CPC)
  • Solid-state, low noise photodiode detector
  • 12, 24, 48, 96 channels of size resolutions
  • NIST traceable size calibration
  • Small, portable design for lab and field use
  • 2 modes of operation designed into the SMS system
  • Single board computer controls and stores more than 30 days of data
  • Light weight and compact design

2 Modes of Operation in One System

The Model 1000XP-B includes a Differential Mobility Analyzer (DMA) and a Condensation Particle Counter (CPC). The DMA and CPC form a Differential Mobility Particle Sizer (DMPS) for counting and sizing aerosol particles in the 10nm to 500nm diameter range. The SMS is operable in the traditional high voltage stepping mode, or in the more rapid, scanning mode, i.e. also known as a Scanning Mobility Particle Sizer, (SMPS). The nominal cycle time for the SMS is 1 minute. For the DMS mode, cycle time is adjustable from 5 min. to 15 min. The instrument’s components can be used singly or in combination to allow the SMS to be used in one of 2 instrument modes as described below:
  • SMS - Scanning Mobility Particle Sizer
  • 10nm – 500nm, 1-minute cycle
  • DMS - Differential Mobility Particle Sizer
  • 10nm – 500nm, 2 min to 15 minute cycle time


The SMS samples aerosol for measurement at the rate of 0.3 liters per minute (L/min). 0.3 L/min of this flow is sampled directly into the DMA for particle size classification and particle counting by the CPC. The data are then sent to the internal, single-board computer for processing and storage. The instrument provides 12, 24, 48, & 96 channels of size resolution. The SMS is recipe-controlled, allowing the scientist, engineer, or system manager to create as many recipes as required for a variety of aerosol studies. These recipes are then stored in memory to be recalled at any time, thus ensuring the same instrument settings can be used for data collection each time a given recipe is put into use.

The SMS uses MSP designed Differential Mobility Analyzer (DMA) with 4D (4-Dimensional) Controls™ of airflow, high voltage, pressure compensation and temperature compensation to provide the most accurate sizing possible. Sheath flow for the DMA is recirculated to provide repeatable stable flow for improved DMA size response. Boltzmann equilibrium charge is established on the aerosol using a low level ionizing source. The CPC is of advanced MSP design that has solved the traditional problems of water condensation and collection in the saturator. A dual reservoir design ensures the condensate is collected into a separate reservoir to avoid mixing of condensed water with the working fluid in the working fluid reservoir. The CPC design features rapid warm-up and response for accurate aerosol measurement.

The photodiode detector is a solid state, low noise device. NIST PSL calibration spheres achieve calibration at 100.7nm and 269nm for the DMA. The DMA and CPC are small, compact devices allowing the entire system to be placed within a small enclosure that is compact in size (12” x 15” x 18”) and light in weight (~35lb). The SMS small compact design allows easy transport between lab and field locations for the research scientist and application engineers requiring wide range particle sizing and counting.

The SMS is the only spectrometer in the world with DMA and CPC technology combined into one single system with integrated display and software. Operation is recipe driven, minimizing set up errors and ensuring repeatable data collection. Data analysis software is included to allow export data to a Laptop/Host computer and convert count distribution data to volume and surface area distributions. Data fitting routines are also provided to allow fitting of size distribution of data by monomodal, bi-modal and tri-modal distribution functions.