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) | Comment |
|---|---|---|---|---|---|
| 120R | 10 | 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32, 0.18, 0.10, and 0.056 | 40 | 30 | Remain available |
| 122R | 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 | End of life effective Dec 31, 2024 |
| 125R | 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 | Remain available |
Applications
- 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
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