Table of Contents
Advertisement
13. Using a very small screw driver, re-install the quartz plate, using the screw
driver the push the O-ring into the gap between the outside diameter of the
quartz and the inside diameter of the acrylic.
14. Very carefully insert the quartz plate until it seats against the wick. It is ex-
tremely important that the quartz plate be in full contact with the wick. While
holding the quartz with your index finger and thumb, use the screwdriver to
push the O-ring up against its sealing surface. Do not over-insert the quartz,
or push on the quartz with too great a force, or the wick will be crushed. If you
bend the wick during installation of the quartz you must repeat the procedure
with a new wick. Be sure the O-ring around the quartz is fully seated before
re-attaching the aluminum ring.
15. Once the quartz is fully installed. Slide the aluminum ring over the quartz. Once
the flange on the aluminum piece is flush up against the O-ring surrounding
the quartz plate, rotate the aluminum so the clearance holes match up with the
threaded holes in the acrylic.
16. Do NOT use loctite on the allan head cap screws holding the aluminum ring to
the acrylic, loctite will disintegrate the acrylic.
17. Re-install the two 6-32 screws, with both flat and lock washers, holding the
aluminum ring to the acrylic. Do not over tighten as the acrylic will crack.
18. Run the PILS for at least one-hour after changing the wick. Then re-check
your background concentration levels to verify leak-free operation. We also
recommend repeating the ammonium sulfate calibration study just to be sure
the droplet collection system is operating properly. Verify the peristaltic pump
liquid sample outlet flow rate agrees with expected values.
9.12 Droplet Impactor Replacement Procedures
Removal of the acrylic piece holding the quartz impactor disk may be necessary to in-
spect proper mating between the fine-mesh wick and the quartz plate or to clean the
quartz impactor disk and wick. Follow these procedures to remove the acrylic piece (with
quartz installed):
83-00009-01A
9.12 Droplet Impactor Removal
PILS 4001-115V and 4001-230V
Page 68 of 74
Advertisement
Table of Contents
