SKC 225-390 IMPACT Sampler - Manual (Page 4)

4
Inserting an Impaction Disc into the IMPACT Sampler
For PM2.5 or PM10 sampling only, insert an impaction disc only aft er a collection
fi lter has been loaded into the fi lter cassett e.
Technical Tidbits:
• Use forceps accessory to carefully insert or remove the collection fi lter. See
Accessories for forceps.
• Install provided rain cover on the inlet of the IMPACT Sampler when sam-
pling outdoors.
• SKC recommends using a new impaction disc for each sample.
For PM2.5 or PM10 only,
ensure a collection filter
has been loaded into the
fi lter cassett e (see Inserting
a Collection Filter into the
IMPACT Sampler).
1
Place impaction disc on fi lter cassett e top.
The rough side of the impaction disc should
face up. SKC-supplied discs are stamped
with "UP" on the appropriate side.
Place fi lter cassett e on exhaust and screw impac-
tor inlet and exhaust together just until tight.
Further hand-tighten by 1/4 turn only.
Keep sampler upright until the inlet is
securely screwed onto the exhaust to
prevent the impaction disc from being
dislodged.
Do not overtighten impactor inlet and
exhaust. Do not use barbed fi tt ing as
leverage when tightening.
3
Reinsert cassett e into impactor.
7
When sampling for PM Coarse using the
Coarse Ring accessory or IMPACT PM Coarse
Sampler, no collection fi lter or stainless steel
support is inserted in the fi rst fi lter cassett e.
Insert a 47-mm collection fi lter into the second
fi lter cassett e (refer to illustration on page 2).
Proceed to Inserting an Impaction Disc into the
IMPACT Sampler.
When sampling for PM Coarse using the
Coarse Ring accessory or IMPACT PM
Coarse Sampler, insert the impaction disc
onto the fi rst fi lter cassett e as directed in Step 2.
Insert a 37-mm collection fi lter in the impaction
disc position on the second fi lter cassett e sup-
plied with the Coarse Ring or the IMPACT PM
Coarse Sampler (refer to illustration on page 2).
Place the fi lter cassett e assembly on the exhaust
and screw impactor inlet and exhaust together
just until tight. Further hand-tighten by 1/4
turn only.