MOUDI Cascade Impactor

MOUDI Cascade Impactor Overview

These precision, high-performance cascade impactors provide high sampling flow rate, low inter-stage wall loss, and sharp cut-point characteristics. They are available as an 8-stage (Model 100) or a 10-stage (Model 110) impactor, in a rotating or a non-rotating form. The Model 100 provides cut-point diameters of 18, 10, 5.6, 3.2, 1.8, 1.0, 0.56, 0.32 and 0.18 µm. Additional cut-points at 0.1 and 0.056 µm are provided with the Model 110. The optional Model 115 Nano-MOUDI adds cut-points in the nanometer range: 32, 18 and 10 nm.

MOUDI Cascade Impactor Specifications

Impactor Stages	Model 100 w/o rotator: 8 Model 100 w/o rotator: 8 Model 110 w/ rotator: 10 Model 110 w/o rotator: 10 Model 115 w/o rotator: 3
Flow Rate, L/min	Model 100 w/o rotator: 30 Model 100 w/o rotator: 30 Model 110 w/ rotator: 30 Model 110 w/o rotator: 30 Model 115 w/o rotator: 10
D50 Diameter, µm	Model 100 w/o rotator: 0.18 to 18 Model 100 w/o rotator: 0.18 to 18 Model 110 w/ rotator: 0.56 to 18 Model 110 w/o rotator: 0.56 to 18 Model 115 w/o rotator: 0.056 to 0.032
(D x H)	Model 100 w/o rotator:220x500 mm Model 100 w/o rotator: 80x360 mm Model 110 w/ rotator: 220x560 mm Model 110 w/o rotator: 80x420 mm Model 115 w/o rotator: 80x190 mm
Weight	Model 100 w/o rotator: 11 kg (24 lb) Model 100 w/o rotator: 2 kg (4.4 lb) Model 110 w/ rotator: 12 kg (26 lb) Model 110 w/o rotator: 2.3 kg (5.1 lb) Model 115 w/o rotator: 1.8 kg (4 lb)
Power	Model 100 w/ rotator: 115 VAC, 60 Hz, 0.3 A Model 110 w/ rotator: 115 VAC, 60 Hz, 0.3 A
Optional	Model 100 w/ rotator: 230 VAC, 50 Hz, 0.2 A Model 110 w/ rotator: 230 VAC, 50 Hz, 0.2 A

MOUDI Cascade Impactor Design

The non-rotating version of each impactor operates as a conventional impactor. In the rotating version, the nozzle and impaction plates rotate relative to each other to form a near-uniform particle deposit on each substrate over a 25-mm diameter impaction area. Nozzle rotation spreads out the particle deposit under each nozzle, thereby reducing the deposited particle mass per unit collector area by a factor up to 1000. More particle mass can thus be collected without overloading the substrate. A large number (up to 2000) of very small nozzles (down to 50 µm in nozzle diameter) are used to reduce the impaction velocity and particle bounce. The pressure drop is also lower, thus minimizing evaporative loss of semi-volatile particles during sampling.

MOUDI Cascade Impactor Features