Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
Tel: 724-941-9701 • www.skcinc.com
SKC User-loaded Disposable
Parallel Particle Impactors (PPI)
The patented† impaction-based SKC Disposable Parallel Particle
Impactor (PPI
collection effi ciency curves for respirable and thoracic dust
specified by ISO 7708/CEN and adopted by ACGIH, CEN,
and other occupational hygiene organizations. Performance
data of the PPI Samplers relative to the ISO 7708/CEN criteria
was published in the Journal of Physics, Conference Series 151,
2009, and the data was made part of the OSHA Docket used
to develop the OSHA fi nal silica rule (fi nal rule page 16439).
The thoracic model meets the requirements of NIOSH Method 5524
for metalworking fl uids and compounds with ACGIH
Disposable PPI Samplers off er the convenience of single use to eliminate
sampler assembly and cleaning; small size for worker comfort, even under helmets or
other PPE; and a choice of fl ow rates for maximum fl exibility in pump options, sample
duration, and contaminant concentration. These instructions are for PPI models that
are NOT preloaded with fi lters and supports; these models contain only impaction
substrates.
Performance Profi le
Sampling Rate: 2 L/min respirable or thoracic and 4 or 8 L/min respirable
Sample Pump: • Universal or AirChek
• Leland Legacy for 8 L/min
Sample Time: Dependent on method used. Note: SKC tests indicate that a particulate
Sample Media 37-mm, 5.0-μm PVC fi lter, 37-mm, 2.0-μm PTFE fi lter*
(recommended): (NIOSH 5524), or 37-mm, 0.8-μm MCE fi lter
Impaction Four 3/8-in diameter pre-oiled porous plastic discs
Substrate: (assembled in all Disposable PPIs)
Analysis: Gravimetric and/or chemical
Body Material: Conductive ABS plastic
Dimensions:
Height: 4.25 in (10.8 cm) - clip to exhaust
Diameter: 1.8 in (4.6 cm)
Depth: 1.2 in (3 cm)
Weight: 1.1 oz (31.2 gm)
Shelf-life: 18 mos from date of manufacture
† U.S. Patent No. 7,073,402
* Back pressure on PTFE fi lters can vary within the same lot.
®
) Samplers are designed to match precisely the
®
thoracic TLV®s.
®
Series for 2 and 4 L/min
mass of up to 6.8 mg on the four impaction substrates would not aff ect PPI
performance. This amount is equivalent to sampling for 6 hours at 4 L/min in
environments where respirable mass concentration is 4.76 mg/m
3
and equals
50% of total dust. However, labs have reported to SKC that they prefer no more
than 2 mg on the fi lter for analytical reasons. Therefore, SKC recommends that
you work with your lab to determine optimum sample times for your unique
sampling conditions.
Use cellulose or stainless steel screen for support
Principle of Operation
SKC Disposable PPI Samplers are impaction-based fi lter samplers that perform
precise size-selection for either thoracic or respirable dust, depending on the model.
PPI Samplers contain four small impactors in the inlet section of the device. Each
impactor features a unique 50% cut-point to target a specifi c one-quarter segment of
the ISO/CEN curve resulting in a precise fi t along the entire curve. A sample pump
operating at 2, 4, or 8 L/min (2 L/min only for thoracic) pulls air through the inlet
nozzle of each impactor in the inlet plate. Particles larger than each impactor’s 50%
cut-point are scrubbed and retained by impaction onto the porous oiled impaction
substrate contained in each impactor. Smaller particles continue to the standard
37-mm collection fi lter for analysis.
Dust enters here
Inlet plate (contains 4 impactors with unique cut-points
preloaded with 4 impaction
substrates and sonically
welded)
Standard 37-mm collection
fi lter (user installed)
Protective
end cap
Exhaust
to pump
Base plate
PPI Performance
Collection effi ciency of the 2, 4, and 8 L/min
respirable PPI Samplers compared to the
ISO respirable curve
37-mm support pad
(user installed)
Collar clip
Collection effi ciency of the 2 L/min
thoracic PPI Sampler compared to the
ISO thoracic convention
2
Media and Sampler Preparation
234
Media Preparation
Condition and weigh fi lters according to method used. Record the weight as the
pre-sample weight.
Sampler Preparation
The PPI will arrive with the inlet plate shrink wrapped and base plate separated.
1. Remove shrink wrap from inlet plate.
2. Using forceps, insert fi rst a 37-mm support pad
and then a conditioned and weighed 37-mm
collection fi lter (if using gravimetric analysis)
into the base plate.
3. Lay base plate on a fl at surface, align inlet plate with base, and press down
fi rmly to achieve an even seal.
4. Write sample ID on sampling label. Adhere sampling label to bo om of
base plate.
5. Remove protective end cap from exhaust.
Technical Tidbits:
• Use forceps to carefully insert or remove collection fi lter and support pad. See
Accessories for forceps.
3
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