Tel: 724-941-9701 Fax: 724-941-1369 e-mail: skctech@skcinc.com
Operating Instructions
863 Valley View Road, Eighty Four, PA 15330 USA
IMPACT Sampler
The patented* IMPACT Sampler is an inertial impactor designed to remove particles
larger than its cut-point by capturing them on a disposable oiled impaction disc that
reduces particle bounce. Particles that are smaller than the cut-point are collected on
a 47-mm fi lter. The IMPACT Sampler mounts easily and makes media changes fast
and simple with its convenient removable fi lter casse e.
The IMPACT Sampler is also part of a cost-eff ective portable particulate sampling
system that ensures the ability to monitor particulate ma er in indoor and outdoor
environments and in urban, industrial, or rural se ings (see Ordering Information for
details on the DPS System or visit www.skcinc.com/prod/100-3901.asp).
Performance Profi le
Flow Rate: 10 L/min
50% Cut-point: 2.5 μm or 10 μm (model dependent)
Impaction Discs: • Recommended impaction disc to reduce particle
• For chemical analysis of larger particles:
Collection Filter: 47-mm fi lter, select material based on application
Impactor Material: Aluminum (inlet) with brass barbed fi ing for
Dimensions: 2.6 dia. x 1.8 H x 3.8 L in (7 x 5 x 10 cm)
Weight: 0.5 lb (0.23 kg)
* U.S. Patent No. 7,334,453
† Back pressure on PTFE fi lters can vary within the same lot.
bounce: 37-mm disposable pre-oiled porous plastic disc
37-mm fi lter (quartz or PTFE
3/8-in ID tubing
†
)
Principle of Operation
PM2.5 inlet
(coarse ring)
37-mm fi lter
Filter cassette
top
47-mm fi nal
collection fi lter
Stainless steel
support
Filter
cassette
bottom
PM10 inlet
37-mm
impaction
disc
Filter
cassette
top
Filter
cassette
bottom
Exhaust
Collection
fi lter
Stainless
steel
support
PM10 inlet
PTFE
O-ring
37-mm
impaction
disc
Filter
cassette
BUNA-N
O-ring
Exhaust
(O-rings not shown)
Exploded view of IMPACT PM10 SamplerExploded view of IMPACT PM Coarse Sampler
Inertial impaction is employed to separate airborne particles according to their
aerodynamic diameter. A sample pump draws particle-laden air at a fl ow rate of
10 L/min through an inertial impactor to separate airborne particles according to
their aerodynamic diameter. Airfl ow enters the impactor through eight nozzles on
top of the sampler. The inlet nozzles are sized to operate at a 10 L/min fl ow rate
causing eight airjets to impinge onto the impaction disc positioned below the inlet
nozzles. Particles larger than the sampler cut-point with enough inertia to cross the
airstream lines impact on the impaction substrate. The airfl ow, containing smaller
particles, makes a sharp turn, passes through the openings in the top of the fi lter
casse e, and follows through to a 47-mm fi lter where the smaller particles collect.
The top of the fi lter casse e accommodates the impaction disc. For optimum impactor
performance, a 37-mm oiled porous plastic disc is recommended as disposable
impaction substrate. If chemical analysis of the larger particles is desired, a 37-mm
fi lter (quartz or PTFE) may be used.
To sample PM Coarse
, a coarse ring accessory can be added to an IMPACT
(PM10-2.5)
PM10 Sampler or an IMPACT PM Coarse Sampler may be selected (see Ordering
Information). Additional impaction and collection media are required for PM Coarse
sampling.
Media Preparation
Collection Filters: Equilibrate and preweigh fi lters in a clean environment according
to appropriate procedures. Record the weight as the pre-sample weight.
Impaction Disc: Ready-to-use pre-oiled disposable plastic impaction discs are available
as SKC Cat. Nos. 225-395 (qty. 25) and 225-395A (qty. 50). Using an oiled impaction
disc reduces particle bounce.
37-mm fi lters (quartz or PTFE) may be used if chemical analysis of larger particles
is desired.
2
Impactor Preparation
13456
Cleaning
For optimum performance, the IMPACT Sampler inlet, exhaust, and fi lter casse e
should be cleaned a er fi ve runs or upon a noticeable buildup of material. This
will remove oil buildup from the top of the fi lter holder and other residue built
up from frequent sampling. Disassemble the impactor and wash parts in water
with a liquid detergent or soap. Rinse and air-dry all parts thoroughly in a clean
environment.
Caution: Do not place any mechanical object in the inlet nozzles.
O-ring Care
Visually inspect the condition of the BUNA-N exhaust O-ring (see illustration on
page 2 for location). Ensure the O-ring surface is smooth (i.e., without cracks, cuts,
or other damage). Ensure the O-ring is fi ed properly in its channel. Replace the
exhaust O-ring if there is apparent damage, stretching, or thinning. It is recommended that the PTFE inlet O-ring (2 in PM Coarse model) be replaced by the
manufacturer only.
Inserting a Collection Filter into the IMPACT Sampler
The IMPACT Sampler will arrive already assembled. Disassemble it to insert
collection fi lter.
Unscrew inlet from exhaust. Remove fi lter casse e.
3a. Use the fi lter casse e opener
accessory to open fi lter casse e.
3b. Slide the fi lter casse e horizontally
into the "U" of the opener until the
two halves of the casse e loosen.
Gently pull halves apart.
Using forceps accessory, place a
preweighed 47-mm fi lter on the
support screen.
Ensure the stainless steel support
screen is in place in bo om of
fi lter casse e.
Press fi lter casse e top into
fi lter casse e bo om.
3
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