SKC 225-370 User Manual
Operating Instructions
Tel: 724-941-9701 Fax: 724-941-1369 e-mail: skctech@skcinc.com
863 Valley View Road, Eighty Four, PA 15330 USA
Sioutas Cascade Impactor
The patented† personal Sioutas Cascade Impactor consists of four impaction stages
and an a er-fi lter that allows the separation and collection of airborne particles in
fi ve size ranges. The Sioutas Cascade Impactor is used with the Leland Legacy
Sample Pump (SKC Cat. No. 100-3002) or any other pump capable of maintaining
a constant fl ow rate of 9 L/min. Particles above each cut-point are collected on a
25-mm PTFE fi lter in the appropriate stage. Particles below the 0.25 μm cut-point
of the last stage are collected on a 37-mm PTFE a er-fi lter. The Sioutas Cascade
Impactor clips onto a worker’s collar in the breathing zone and the pump clips onto
the worker’s belt. For area sampling, the impactor can be a ached to a tripod or
clipped in an appropriate location. The Sioutas Impactor may be used for ambient
outdoor sampling with special provisions (see Sampling on page 7). Size-fractionated
samples can be analyzed gravimetrically, chemically, and microscopically.
† U.S. Patent No. 6,786,105
®
Performance Profi le
Flow Rate: 9 L/min
50% Cut-point at 9 L/min: Stage A 2.5 μm
Stage B 1.0 μm
Stage C 0.50 μm
Stage D 0.25 μm
Recommended
A er-fi lter Type: (SKC Cat. No. 225-1709)
Recommended Filter
for Stages: 25-mm, 0.5-μm PTFE fi lter with laminated PTFE
support (SKC Cat. No. 225-2708)
Certification: EPA-ETV has verified the Sioutas Impactor
Wind Velocity: < 5 mph
A er-fi lter Operating
Temperature (maximum): 464 F (240 C) based on PMP support ring
Maximum Particle Load: Varies per stage. See NUATRC Report No. 2 at
www.sph.uth.tmc.edu/mleland/a achments/
MLeland_Sioutas2.pdf.
Impactor Material: Inlet/oulet plates and stages are anodized
autoclavable aluminum; O-rings are Buna-N
(Nitrile); fi lter retainers are acrylic; compression
ring is PTFE
Inlet and Outlet Inlet: 3/8-in OD, 1/4-in ID
Diameters: Outlet: 3/8-in OD, 1/4-in ID
Dimensions: 3.4 x 2.2 in (8.6 x 5.6 cm)
Weight: 5.6 oz (159 gm)
37-mm, 2.0-μm PTFE fi lter* with PMP support ring
performance with the Leland Legacy sample pump.
See www.epa.gov/nrmrl/std/etv/vt-ams.html#pcis
for details.
Tubing: 3/8-inch ID
* Back pressure on PTFE fi lters can vary within the same lot.
2
Disassembly
1
4
The Sioutas Impactor will arrive already assembled with the exception of the fi lter
retainers, which are included, but packaged separately. Disassemble it to clean
(see Cleaning), to load with filters (see Assembly), or to remove filters after
sampling.
Disassemble the impactor from inlet to outlet (see Figure 1 and follow Steps 1-7):
Thumb
nuts
Inlet
plate
Clip
Figure 1. Sioutas Impactor, exploded view
Remove thumb nuts.
Accelerator plate A
Accelerator plate B
Collector plate
Accelerator plate C
Collector plate
Accelerator plate D
Collector plate
Remove inlet plate.
Collector plate
Threaded
studs
Outlet
plate and
after-fi lter
housing
Li off together accelerator plate A and
collector plate.
Li accelerator plate A off
collector plate.
3
567
Repeat Steps 3 and 4 for stages B-D.
1
Remove O-ring from outlet plate
(see Figure 2).
Remove compression ring from outlet
plate (see Figure 2).
O-ring
ring
Spacer ring
Compression
Figure 2. Outlet plate, exploded view
Screen
Outlet
plate
Note: Use forceps to carefully insert or remove impaction substrate, a er-fi lter,
and fi lter retainers.
Media and Impactor Preparation
Equilibrate and pre-weigh the fi lters in a clean environment according to appropriate
procedures. Record the weight as the pre-sample weight.
Clean the Sioutas Impactor in between samples to remove any residual particles.
See Cleaning.
Assembly
In a clean environment, assemble the Sioutas Impactor from outlet to inlet as
follows:
Caution: Handle all fi lter material with forceps.
Remove O-ring and compression ring
from outlet plate (see Disassembly,
Steps 6 and 7 and Figure 2).
Insert 37-mm a er-fi lter in outlet plate.
Replace compression ring and O-ring.
Caution: Ensure that the screen and spacer ring (Figure 2) are in place before
inserting fi lter. The screen prevents the fi lter from restricting the outlet.
4
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