Parallel Particle Impactor
|PPI — How
PPI models are available for thoracic sampling at 2 L/min and respirable sampling at 2 L/min or 8 L/min.
Data in Figures 1 and 2 indicate performance of the Respirable
PPI and Thoracic PPI are in agreement with their respective ACGIH/CEN/ISO
conventions. Experiments revealed that a load of approximately 6.4
mg of coal mine dust on the sampler substrates (impaction plates)
did not adversely affect performance of the PPIs.
8 L/min Respirable PPI — Ideal for
New Lower Silica TLV
The 2010 ACGIH TLV for respirable crystalline silica has been lowered to 0.025 mg/m3. As limits are decreased, sampler sensitivity needs to increase. SKC introduces the new 8 L/min Parallel Particle Impactor (PPI). The sampler’s higher flow rate provides for increased sensitivity by collecting more sample material to accurately measure occupational exposure at new lower limits. The 8 L/min PPI is ideal for sampling the new lower TLV for crystalline silica
The penetration characteristics of the SKC 8 L/min Respirable PPI were tested using PST test particles compared to the respirable convention.
Comparison of the respirable convention curve with theoretically
predicted performance of samplers containing a different number of
internal impactors arranged in parallel.
(Click to enlarge)
|Sampling Rate||2 L/min or 8 L/min|
|Sample Pump||Universal or AirChek for 2 L/min, Leland Legacy for 8 L/min|
|Sample Time||Dependent on method used|
|Sample Media|| |
37-mm, 5.0-µm PVC filter, or
|Four 3/8-in dia. pre-oiled porous plastic disc|
|Analysis||Gravimetric or other|
|Body Material||Conductive aluminum|
|Dimensions||Height: (clip to exhaust): 3.74 in (9.4 cm)
Diameter: 1.7 in (4.3 cm)
Depth: 1.1 in (2.8 cm)
|Weight||3.3 oz (94 gm)|
Each PPI sample requires:
All items are available separately.
|Thoracic PPI (blue) , 2 L/min, aluminum, requires substrates, filters, and supports||ea||225-381|
|Respirable PPI (gold), 2 L/min, aluminum, requires substrates, filters, and supports||ea||225-380|
|Respirable PPI (red), 8 L/min, aluminum, requires substrates, filters, and supports||ea||225-383|
|Recommended Collection Filters for PPI, required for sampling, select the filter appropriate for your application|
|PVC Filters, 37 mm, 5.0-µm pore size||50|
|PTFE Filters, 37 mm, 2.0-µm
pore size for metalworking fluids (NIOSH 5524)
Back pressure on PTFE filters can vary within the same lot.
|MCE Filters, 37 mm, 0.8-µm pore size||100|
|Filter Supports, required for sampling; select either cellulose or stainless steel|
|Support Pads, cellulose, 37 mm||100||225-27|
|Stainless Steel Screen, 37 mm, wide mesh||ea||225-26|
|Impaction Substrates, 4 required for each sample|
|Porous Plastic disc, 3/8-inch diameter, pre-oiled, ready to use, disposable, limited shelf life||200||225-388|
|Multi-purpose Calibration Jar||ea||225-111|
|Forceps, stainless steel, with non-serrated flat tips||ea||225-8371|
|Filter-Keeper, for transporting and storing 37-mm filter samples||10|
Trakumas, S., Hall, P., Personal Respirable Sampler Containing Four Impactors Arranged in Parallel, Abstracts of 23rd Annual AAAR Conference, Atlanta, GA, 2004, p. 78
Trakumas, S., Salter, E., "Parallel Particle Impactor - Novel Size-selective Particle Sampler for Accurate Fractioning of Inhalable Particles," Journal of Physics: Conference Series 151 (2009), 16 pp., 012060
The link in Reference 2 is an author-created, un-copyedited version of an article accepted for publication in the Journal of Physics: Conference Series 151. IOP Publishing Ltd. is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online. Go to http://dx.doi.org, enter doi: 10.1088/1742-6596/151/1/012060.
Trakumas, S., "High-flow Personal Respirator Dust Sampler for Increased Sensitivity," Poster 261, AIHce 2010, Denver, Co
Trakumas, S., "High-flow Personal Sampler to Monitor Exposure to Respirable Crystalline Silica at New Lower TLV," IOHA 2010 8th Conference Book of Abstracts, Rome, p.59
Trakumas, S., Salter, E., "High-Flow Personal Sampler to Monitor Exposure to Respirable Crystalline Silica at New Lower TLV" PowerPoint Presentation