MOUDI™ II Impactor Model 120R

Product Details

The MOUDI™ II 120R is a second-generation Micro-Orifice Uniform Deposit Impactor (MOUDI™) that incorporates ten impaction stages plus a final filter and an inlet stage with an 18 µm cut point. The impactor separates particles into four equal geometric intervals per decade of particle size, providing detailed aerosol size distribution measurements from coarse to ultrafine particles.

Thousands of precision micro-orifice nozzles minimize pressure drop, particle bounce, and re-entrainment while maintaining sharp cut-size performance and low inter-stage losses. Individual stepper motors continuously rotate each impaction plate during sampling, producing quasi-uniform particle deposits that improve sample quality and support quantitative chemical analysis.

The integrated PLC-based control system with touch-screen interface allows users to program sampling schedules, control pumps, monitor operating conditions, and record instrument data throughout the sampling period. Temperature and pressure measurements are automatically logged and can be downloaded for further analysis. Ethernet connectivity enables remote instrument operation.

Interchangeable impaction plates, filter holders, and sealed transport covers simplify sample preparation and help preserve sample integrity during transport and storage.

Applications

• Atmospheric aerosol research 
• Ambient air quality monitoring 
• Source apportionment studies 
• Engine and combustion emissions analysis 
• Brake wear particle characterization 
• Occupational exposure monitoring 
• Industrial hygiene investigations 
• Tobacco smoke and e-cigarette aerosol studies 
• Biological aerosol characterization 
• Environmental monitoring programs 

Features and Benefits

• High-resolution aerosol size fractionation from 10 µm to 56 nm, with an inlet that cuts at 18 µm
• 30 L/min sampling flow rate 
• 10 impaction stages plus final filter: 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.10, and 0.056 µm
• Internal rotating impaction plates provide nearly uniform particle deposits 
• Sharp cut-size characteristics for accurate particle classification 
• Micro-orifice nozzle technology minimizes pressure drop, particle bounce, and re-entrainment 
• Low inter-stage particle losses 
• PLC-controlled operation with touch-screen user interface 
• Programmable start/stop scheduling and pump control 
• Real-time monitoring and recording of temperature and pressure data 
• Ethernet connectivity for remote operation 
• Removable substrates and filter holders for efficient sample handling