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MOUDI-II Impactors 120R, 122R, 125R

SKU: 120R

MOUDI-II and NanoMOUDI-II impactors are second 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.

Product Details

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 (ideal for some types of chemical analysis). Sampling flow rates are 30 L/min for the models 120 and 122, and 10 L/min for the model 125. These 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 for these impactors start a 10 mm and end at 56 nm for the 120, and at 10 nm for the 122 and 125 (see table below).

Model Stages Nominal Cut Points (µm) Pressure Drop (kPa) Flow Rate (L/min)
120 10 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.10, and 0.056 40 30
122 13 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.10, 0.056, 0.032, 0.018 and 0.010 90 30
125 13 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.10, 0.056, 0.032, 0.018 and 0.010 90 10



  • 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 

Features and 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