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MOUDI-II™ Impactors 120R, 122R, 125R

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Product Details

MOUDI-II™ and NanoMOUDI-II impactors are 2 nd generation Micro-Orifice, Uniform-Deposit Impactors from MSP.  These impactors are noted for their superior aerodynamic design, sharp cut-size, and low particle loss characteristics. Up to 6000 precision micro-orifice nozzles are used to reduce pressure drop, jet velocity, particle bounce, and re-entrainment. 


Individual stepper motors in the Moudi-II impactors provide reliable long-term, internal impaction plate rotation to spread out the particles so they collect in a nearly uniform deposit. Sampling flow rates are 30 L/min for the models 120 and 122, and 10 L/min for the model 125. The impactors are designed to collect size-fractionated particle samples in four equal geometrical intervals per decade of particle size for mass or chemical analyses. The nominal cut-size diameters are: 10, 18, 32, 56, 100, 180, 320, 560 nm, and 1.0, 1.8, 3.2, 5.6, and 10 µm.

Features & Benefits

  • 30 L/min or 10 L/min sampling flow rate
  • Sharp cut-off size characteristics
  • Reliable internal impaction plate rotation provides nearly uniform particle deposits for better quantitative chemical analysis
  • Micro-orifice nozzle plates designed for low flow resistance and reduced particle bouce and re-entrainment
  • Up to 13 impactor stages with nominal cut points between 10 nm and 10 µm, plus a final filter
  • Low inter-stage losses
  • Easily removable collection substrates allow for quick turn-around time for productive use of the instrument
  • Programmable logic controller (PLC) controls instrument operation including start and stop times
  • Instrument temperature and pressures are measured, recorded, and stored at pre-determined time intervals
  • Pump control (ON/OFF)
  • Remote operation capability via Ethernet
  • Made of hard coated anodized aluminum for light weight, durability and nozzle dimensional stability


  • Sampling of atmospheric aerosols for research and environmental monitoring
  • Workplace aerosol analysis
  • Engine emissions analysis and monitoring
  • Brakewear analysis and monitoring
  • Exposure monitoring
  • Industrial hygiene studies
  • Tobacco smoke and e-cigarette characterization
  • Biological aerosol characterization 



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