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7. before handling the new paper strips, put on latex gloves
8. carefully blow off any loose fibers from the new strips using clean compressed
air
9. install the new paper strips into the cartridge, carefully inserting the metal rod
spacers between each strip
10. slide the cartridge assembly back into place
11. remove gloves
12. apply a very small amount of Oring grease to the Oring in the aluminum end
plate
13. apply a small drop of fresh loctite to the four denuder end plate screws
14. re-attach the aluminum end plate with the four screws, making sure they are
tight
15. reinstall the denuder into the sample inlet
9.11 Droplet Impactor Wick Replacement and Quartz Cleaning
During normal operation of the PILS, the stainless steel wick surrounding the circum-
ference of the quartz impactor plate will become loaded with undissolved particulate
matter. The quartz impactor plate can also begin to appear grey in color due to the im-
paction and sticking of soot and other particles. Periodically inspect the wick and quartz
for cleanliness and verify that the liquid sample collection system is operating properly
(no air in liquid sample outlet flow from peristaltic pump and expected liquid sample
flow rate).
To replace the wick and clean the quartz plate, the acrylic piece holding the quartz im-
pactor disk does not need to be removed. A video is also available showing how to replace
the wick. Follow these procedures to remove the quartz plate and replace the wick:
1. Loosen and remove the two 6-32 stainless steel allen head cap screws holding
the black anodized aluminum ring around the quartz plate. These screws are
screwed into the acrylic piece holding the quartz. Gently remove the aluminum
ring. Store in a safe place.
83-00009-01A
PILS 4001-115V and 4001-230V
9.11 Wick Replacement
Page 66 of 74
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