A1b. PI_MOUDI-II-Impactors_Model_Web SPEC SHEET.pdf

MOUDI II™ Impactors Models 120R, 125R

Achieving uniform particle deposition on by internal stepper-motor stage rotation

The MOUDI II™ series, including the 120R and 125R, builds on the legacy of the original MOUDI™ with advanced precision cascade impactors designed for high-accuracy aerosol sampling. These instruments collect size-fractionated particle samples for gravimetric and chemical analysis, featuring exclusive stepper motors to ensure nearly uniform particle deposition.

Both models utilize micro-orifice nozzles to minimize jet velocity, pressure drop, particle bounce, re-entrainment, and evaporative loss. Their aerodynamic design ensures sharp cut-size characteristics, low inter-stage losses, and accurate cut-size calibration, making them ideal for high-quality aerosol and environmental research.

The 125R operates at 10 L/min with 13 stages and a smallest cut-point of 10 nm. The 120R is a 10-stage, 30 L/min model with a smallest cut-point of 56 nm.

Advanced electronics monitor stage rotation, instrument temperature, and pressure stability during sampling.

Built-in sensors detect potential nozzle clogs, while remote control via Ethernet enhances usability.

Both models 120R and 125R are provided with instrument cabinets that also house the electronics for controlling the pump operation, monitoring and recording the output of the six pressure transducers. These features ensure the high quality of samples collected by the user.

Features

nearly uniform particle deposits for better quantitative chemical analysis

▪ �Micro-orifice nozzle plates designed for low flow resistance and reduced particle bounce and re-entrainment

▪ �Up to 13 impactor stages with nominal cut points between 10 nm and 10 µm, plus a final filter

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

durability and nozzle dimensional stability

Applications

▪ �Sampling of atmospheric aerosols for research and environmental monitoring

TSI Incorporated - Visit our website www.tsi.com for more information.

USA Tel: +1 800 874 2811 UK Tel: +44 149 4 459200 France Tel: +33 1 41 19 21 99 Germany Tel: +49 241 523030

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Printed in U.S.A.

MOUDI II™ Impactors Models 120R, 125R

Specifications

P/N 5003260 Rev A ©2025 TSI Incorporated

TSI and the TSI logo are registered trademarks of TSI Incorporated in the United States and may be protected under other country’s trademark registrations.

Environmental Operating Conditions (impactor and cabinet) 10–50ºC (50–122ºF) 10%–90% RH (non-condensing)

To Order MOUDI II™ Impactors

Accessories

Specifications Model 120R Model 125R

Impactor Stages 10 13 Flow Rate, L/min 30 10 Pressure Drop, kPa (w/o final filter)

41 90

Cut-point Diameter, µm

0.056, 0.10, 0.18, 0.32, 0.56, 1.0, 1.8, 3.2, 5.6, 10, 18

0.01, 0.018, 0.032, 0.056, 0.10, 0.18, 0.32, 0.56, 1.0, 1.8, 3.2, 5.6, 10

Dimensions (D x H) or (W x L x H)

80 x 510 mm (impactor) 210 x 640 mm (cabinet)

80 x 510 mm (impactor) 210 x 640 mm (cabinet)

Weight (total) 19 kg (42 lb.) 14 kg (31 lb.)

Power (cabinet) 100–240 VAC, 50–60 Hz, 30 W

100–240 VAC,

50–60 Hz, 30 W

Vacuum Pump Requirements

Carbon Vane, 115 or 230 VAC, 50–60Hz,

0.56 kW

Oil-sealed Pump, 115 or 230VAC, 50–60 Hz, 0.9 kW

All MOUDI™ II impactors have the same aerodynamic design as in the original MOUDI™ impactors that have led to sharp cut characteristics (see Figure 1) and low inter-stage wall losses. The rotating version of the MOUDI II impactors are 2nd generation MOUDI impactors using individual stepper motors embedded in each stage to rotate the collecting substrate for uniform deposition.

Power for the stepper motors comes from a single electronic package in the instrument cabinet, with power distributed to the individual motors by miniature flat-ribbon cables. Figure 2 shows a typical rotating stage, and Figure 3 shows a photograph of the stage with the uniform particle deposition on the center circular area.

Figure 1. �Typical stepper motor operated impaction stage

Figure 3. �Typical stage with uniform deposit

Figure 2. 125R Stage efficiency curves

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