4
MEDIA PREPARATION
Collection Filters:
Equilibrate and pre-weigh
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 included
with the system (qty. 25). Replacement pre-oiled plastic 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 (quar
tz
or PTFE) may be used if chemical analysis of larger par-
ticles is desired.
IMPACTOR PREPARATION
Cleaning
For optimum performance, the IMPACT Sampler inlet, exhaust, and
fi
lter cas-
se
tt
e should be cleaned after
fi
ve runs or upon a noticeable buildup of material.
This will remove oil buildup from the top of the
fi
lter casse
tt
e 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.
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 3 for location
). Ensure the O-ring surface is smooth (i.e., without cracks, cuts,
or other damage). Ensure the O-ring is
fi
tt
ed properly in its channel. Replace the
exhaust O-ring if there is apparent damage, stretching, or thinning. It is recom-
mended that the PTFE inlet O-ring be replaced by the manufacturer only.
