TSI 135 Mini-MOUDI Impactors

Description of TSI 135

The Model 135 Mini-MOUDI impactors can have 6, 8 or 10 stages, operating at a sampling flow rate of 2 L/min for a variety of sampling applications. The Mini-MOUDI impactor has stages available with cut-point diameters of 0.056, 0.10, 0.18, 0.32, 0.56, 1.0, 1.8, 3.2, 5.6 and 10 μm.

For a Model 135 stage, half of the area is the impaction plate for the stage above while the other half contains the nozzles for that stage. Subsequent stages alternate in orientation so that there is always an impaction surface below each set of nozzles. This arrangement allows for a very compact cascade impactor design (Figure 2).

The Model 135 impactors can accept a variety of sampling substrates, including aluminum foils, thin plastic films and membrane filters. The substrates are 37-mm in diameter with a semicircular hole in one half of the substrate (Figure 3).

The stages are designed to prevent cross-flow interference between adjacent nozzles. The result is sharp cut-size characteristics not available with other cascade impactors that are less well designed aerodynamically (Figure 3).

The Models 135-6 and 135-8 can be used with personal sampling pumps since they have a low pressure drop. The Model 135-10 requires a vacuum pump due to the larger pressure drop associated with the last two stages.

Applications

• Personal exposure particle monitoring
• Work place aerosol analysis
• Cigarette and E-Cig smoke characterization
• Indoor residential aerosol studies

Features and Benefits

• 2-L/min sampling flow rate
• Up to 10 impactor stages with nominal cutpoints at 0.056, 0.10, 0.18, 0.32, 0.56, 1.0, 1.8, 3.2, 5.6 and 10 μm, plus a final filter
• 37-mm diameter semicircular impaction substrates
• 37-mm final filter
• Impactor is made of anodized aluminum for light weight, durability and nozzle dimensional stability
• Low pressure drop
• Sharp cut-off characteristics
• Open Inlet or Inlet Cone
• Low inter-stage losses

Technical specifications of TSI 135