Chapter 4
Figure 4–3: Internal Filter Replacement
3. Turn the aerosol monitor over on its keypad so the filter wells are facing
up.
4. Use the small flat-blade screwdriver to unscrew the retaining screws at
the center of each filter well. The screws are “captive” and will stay in
the caps.
5. Grip the screw heads between your thumb and forefinger. Lift to pull
the filter well caps off. There is an O-ring under each cap that may lift
out with the cap.
6. Pull out the internal filter elements and discard them.
7. Clean the inside of the filter wells if necessary with a mild solvent like
isopropanol and a cotton swab. Do not use compressed air.
8. Replace the internal filter elements with TSI part no. 800666.
Note: Only the recommended high efficiency particulate air (HEPA)
filters should be used. The D
USTTRAK monitor should never be
run without filters in place. Doing so will contaminate the
optics and probably require you to send the unit back to the
factory for cleaning.
9. Replace the O-rings and caps.
10. Use the small screwdriver to tighten the hold-down screws until “finger-
tight.” Do not over-tighten.
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