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M120/122/125 MOUDI-II Impactors
M120, M122, M125 Moudi-II™ and NanoMoudi-II™ IMPACTORS are 2nd generation Micro-Orifice, Uniform-Deposit Impactors from MSP. The MOUDI™ impactors are noted for their superior aerodynamic design, sharp cut-size, and low particle loss characteristics. Up to 2000 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 rotate internal impaction plates to spread out the particle deposit into a nearly uniform layer within a 25-mm-diameter circular area. Non-rotating versions of the impactors are also available.
Sampling flow rates are 30 L/min for the M120 and M122 and 10 L/min for the M125. The impactors are designed to collect size-fractionated particle samples in 4 equal geometrical intervals per decade of particle size for mass or chemical analyses. The cut-size diameters are: 10, 18, 32, 56, 100, 180, 320, 560, 1000, 1800, 3200, 5600, and 10000 nm. (Model 120R shown for purposes of illustration.)