SKC Preloaded Disposable Parallel Particle Impactor Operating Instructions Manual

Operating Instructions

863 Valley View Road, Eighty Four, PA 15330 USA

Tel: [phone] • www.skcinc.com

SKC Preloaded Disposable

Parallel Particle Impactors (PPI)

The patented† impaction-based SKC Disposable Parallel Particle Impactor (PPI®)
Samplers are designed to match precisely the collection efficiency curves for
respirable and thoracic dust specifi ed by ISO 7708/CEN and adopted by ACGIH,
CEN, and other occupational hygiene organizations. The performance of the
respirable PPI samplers also meets the ISO 7708/CEN criteria included in the OSHA
fi nal silica rule. The thoracic model meets the requirements of NIOSH Method 5524
for metalworking fl uids and compounds with ACGIH
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 pre-assembled

with fi lter, support, and impaction substrates.

®

thoracic TLV®s. Disposable

Preloaded fi lters in some models are available preweighed by SKC for gravimetric
analysis. See the table below.

Respirable PPIs Preloaded Filter

225-3841
225-3851
225-3871
225-3841-PW
225-3851-PW
225-3871-PW

Thoracic PPIs Preloaded Filter

225-3861 0.8-μm MCE fi lter, not preweighed
225-3862 Quartz fi lter, not preweighed

† U.S. Patent No. 7,073,402

5.0-μm PVC fi lter for chemical analysis, not preweighed. For gravimetric analysis,
contact your laboratory to pre and postweigh fi lter.

5.0-μm PVC fi lter preweighed by SKC for gravimetric analysis
Preweighed at 70 F ± 3 F and 50% ± 5% relative humidity

Performance Profi le

Sampling Rate: 2 L/min respirable or thoracic, 4 or 8 L/min respirable

Sample Pump: • Universal XR or AirChek

• Leland Legacy for 8 L/min

Sample Time: Dependent on method used.

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
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.

Sample Media: Respirable models: 37-mm, 5.0-μm PVC fi lter and cellulose

support pad

Thoracic model: 37-mm, 0.8-μm MCE fi lter and cellulose

support pad or 37-mm Quar fi lter and cellulose support pad

Impaction Four 3/8-in diameter pre-oiled porous plastic discs
Substrate: (Assembled in all Disposable PPIs)

Analysis: Chemical or gravimetric

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

®

Series for 2 and 4 L/min

Note: SKC tests indicate that a particulate

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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 (assembled)

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
(assembled)

Collar clip

Collection effi ciency of the 2 L/min

thoracic PPI Sampler compared to the

ISO thoracic convention

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