SKC 225-380 Parallel Particle Impactor - Manual (Page 3)

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4. Using forceps, insert a 37-mm support pad and a 37-mm collection fi lter into
the base plate.
Inserting Impaction Substrates into the PPI
1. Ensure a support and collection fi lter have been loaded into the base plate
(see Inserting a Collection Filter).
2. Using forceps, insert a pre-oiled impaction sub-
strate into each of the four indentations in the
impaction plate.
Impaction substrates have a smooth/shiny side and
a rough/dull side. For optimum particle capture
effi
ciency, place substrate smooth/shiny-side down
in the impaction plate.
3. Align pins in inlet plate with holes in impaction
plate and press together.
Pins will allow impactor to be assembled one
way only.
4. Grip impaction plate and inlet plate together and
twist on base plate until screw holes are aligned.
5. Replace and tighten two screws to secure inlet plate
to base plate.
Technical Tidbits:
• Use forceps to carefully insert or remove impaction substrate and collection
fi lter. See Accessories for forceps.
• SKC recommends using new impaction substrates for each sample period.