MOUDI Cascade impactor and Nano MOUDI

Applied Physics, Inc.


Applied Physics, Inc.

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Aerosol Product Information

MOUDI Cascade Impactor

MOUDI Cascade Impactor, High Concentration,
Model 125 - Request a Quote

Model 125B Rotating MOUDI cascade impactor, Model 125A Non-Rotating MOUDI cascade impactor

The 125B Rotating, Nano-MOUDI Cascade impactor is designed for high concentration aerosols, is provided with 13 stages from 10nm to 18um, very sharp cut points, very low particle bounce performance, On and Off digital timer control and flow meter control.

  • Precision, size range sampling of high concentration particle aerosols for
    - air pollution
    - diesel exhaust, blow by and engine emission SMOG testing
    - vehicle air bag testing
    - hygiene studies in production areas
  • Very Sharp, particle cut-points with little bounce at each stage
    - 10 Liters per minute sampling flow rate
    - 13 impactor stages after input air filter
    - Cut Points at 18 um, 10 um, 5.6 um, 3.2 um, 1.8 um, 1.0 um, 0.56 um, 0.32 um, 0.18 um, 0.10 um, 32 nm, 18 nm, 10 nm
  • Rotating Cascade Impactor (Model 125B Nano-MOUDI) and Non-Rotating Cascade Impactor (Model 125A Nano-MOUDI
nano-moudi cascade impactor
Select the MOUDI Cascade Impactor that meets your requirements with this Cascade Impactor, Performance CHART
MOUDI Cascade Impactor

MOUDI Cascade Impactor: Model 100, Model 110, Model 115 and Model 125
- Request a Quote

The MOUDI cascade impactor provides sampling flow rates of 10 lpm or 30lpm low inter-stage wall loss and sharp particle, cut-point characteristics (see figure on right).

The Cascade Impactor is available with 8-stages (M100) or 10 stages (M110) Cascade impactor, in a rotating or non-rotating operation (see photos above). The M100 Cascade Impactor provides cut-point diameters of 18 um, 10 um, 5.6 um, 3.2 um, 1.8 um, 1.0 um, 0.56 um, 0.32 um, 0.18 um.

Additional cut-points at 0.100 um and 0.056 um are included with the M110 Cascade Impactor. The M115 Nano-MOUDI, cascade impactor has cut-points only in the nanometer range of 32 nm, 18 nm and 10 nm.

Nano-MOUDI Impactor

cascade impactor
Rotating Moudi Impactor

General Discussion - Request a Quote

MOUDI M100 and M110 Cascade impactors consist of 8 and 10 stages connected in series with sequentially smaller cut-point diameters. Designed for low concentration aerosols, the MOUDI 100 and MOUDI 110 sample diameters in each stage depend on the air velocity and geometry of the stage (i.e. the distance from the nozzle to the impaction plate). The MOUDI 110 cascade impactor has cut-point stages of 10um, 5.6um, 3.2um, 1.8um, 1um, 560nm 320nm, 180nm, 100nm, 56nm @ 30 lpm inlet flow with final filter and single stage pre-impactor of 18um. This gives the opportunity to analyze (e.g. chemical or gravimetrical) a number of small size intervals.

moudi cascade impactor

Some drawbacks of poorly designed cascade impactors are the risk of bounce off from one stage to the next (i.e. particles of wrong size at a different stage) as well as the problem of obtaining sharp cut-off diameters in the last stages (cut-off diameter less than 0.1 um). Coating the impaction plates with oil or some other sticky substance, which catches the particles more effectively, can reduce the risk of bounce, but will severely complicate direct mass concentration calculations of the different stages. The MOUDI Impactor is designed with superb cut-point resolution across the entire size range of 10nm to 18um with minimal bounce at each stage. The non-rotating, Nano MOUDI (see below discussion) provides sharp cut-points at 32nm, 18nm and 5.6nm at equally high resolution.

Features and Applications

Cascade Impactor cut point performance
Model 100 and 110 Nano-MOUDI Cut-Point Performance
Model 100, 110 and 115 MOUDI
  • Precision size classification of aerosols for
    - air pollution
    - pharmaceutical aerosol drug delivery
    - diesel blow by and engine emission testing
    - automotive airbag testing
    - industrial hygiene studies
  • Sharp cut-point characteristics
  • Four equal geometrical intervals per decade of particle size
  • Models 100 and 110
    - 30-L/min sampling flow rate
    - 8 and 10 impactor stages + after filter
    - 0.18µm and 0.056µm minimum cut-point
  • Model 115
    - 10-L/min sampling flow rate
    - 3 impactor stages + after filter
    - 32, 18 and 10nm minimum cut-point

MOUDI Impactor Specifications - Request a Quote

(Subject to change without notice)
  Model 100 with rotator Model 110 with rotator Model 110 -1    w/o
Model 125 B
with rotator
Model 115 w/o rotator*
Impactor stages 8 10
10 13 3
Flow rate, L/min 30 30 30 10 10
Cut-points, µm 18, 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18 µm
18, 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.1, 0.056 µm 18, 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.1, 0.056 µm 18um, 10, 5.6, 3.2, 1.8, 1.0, 560nm, 320, 180, 100, 56, 32, 18, 10nm 32nm, 18nm 10 nm
(D x H) 80 x 420 mm 220 x 560 mm 220 x 560 mm 220 x 660 mm 80 x 190 mm
Weight 11 kg (24 lb) 12 kg (26lb) 2.3 kg (5.1 lb) 14 kg (29lb) 1.8 kg (4 lb)
Power 115 VAC, 60 Hz, 0.3A  115 VAC, 60 Hz, 0.3A 115 VAC, 60 Hz, 0.3A  115 VAC, 60 Hz, 0.3A  
Optional 230 VAC, 50 Hz, 0.2A  230 VAC, 50 Hz, 0.2A 230 VAC, 50 Hz, 0.2A  230 VAC, 50 Hz, 0.2A
*The Model 115, 3-stage Nano-MOUDI™ is available in a non-rotating version only. The Model 115 and Model 125 requires a separate 6 CM/H vacuum pump (NAN-090) to operate.

Model 115, Nano-MOUDI Cascade Impactor

The principle of operation of the Nano-MOUDI is the same as that of the MOUDI™ impactor. It classifies particles according to aerodynamic size by inertial impaction in several multi-nozzle stages stacked in series.

The design configuration chosen for the nano-MOUDI adds three stages to the standard 10-stage MOUDI™. The cut sizes of these stages follow the four cuts per decade of particle size progression of the standard MOUDI™. Therefore, the cut sizes are 32nm, 18nm and 10nm. The absolute pressure after the last stage of the standard 10-stage MOUDI™ is about 0.60 atm. By adding three stages, the absolute pressure at the stages will become low enough so that the volumetric flow will be larger than the flow that can be pulled through a micro orifice nozzle plate. Therefore, the flow rate through the nano-MOUDI stages is decreased to 10 lpm (the flow rate in the standard MOUDI™ is 30 lpm).

M115 Nano-MOUDI
The design parameters for the nano-MOUDI stages are shown in Table I, along with the parameters for the standard MOUDI Cascade Impactor. Note that the Reynolds Number is generally in the range of 500 to 3,000, the desired range for impactor operation. However, the Reynolds Number of the final stages are slightly lower than this dynamic range. The pressure at the last stage is about 0.12 atm. Although this is a low pressure, it is substantially higher than of a low pressure cascade impactor, which has pressures on the order of 0.03 atm for cut sizes of 0.05 um. Corresponding pressures for the MOUDI Cascade Impactor at that large of a cut size is 0.60 atm.
M115 and M125 Nano-MOUDI, Cut-Point Resolution

M125 Nano-MOUDIFeatures and Applications

M125B Rotating MOUDI and M125A Non-Rotating Nano-MOUDI
  • Sharp cut points, high resolution of particle size classification for
    - Monitoring SMOG and air pollution
    - diesel exhaust blow by and engine emission testing
    - vehicle airbag testing
    - hygiene particle studies
  • Very Sharp cut-point characteristics with little particle bounce from each stage
  • - 10-L/min sampling flow rate
    - 13 impactor stages + after filter
    - 18um, 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.1, 32nm, 18nm, 10nm cut-points
  • Rotating M125B) and Non-Rotating M125A impactors available