NO3/NH4/SO Inlet Filter Replacement

Purpose: Replace the three 7 micron filter elements in the NO3/NH4/SO4 Inlet.

Required Equipment: Three 7 micron filter elements,

One pair of plastic gloves,

9/16” wrench

Two 3/4” wrenches,

Kimwipes.

References: www.atmospheric-research.com/reference/Schematics/NH4-NO3%20Inlet.jpg

Changing the NO3/NH4/SO4 Inlet Filters:

1. At the PC, down the “NO3NH4” & “SO4” channels.

2. At the NO3/NH4 inlet box, open the inlet box cover.

3. Locate the 3 inlet filter holders - they are stainless and are approximately 3 inches long.

4. Replace the filters one at a time.

5. Put on the plastic gloves (do not handle the filters with your hands).

6. Remove the first filter housing using the 9/16” wrench.

7. Unscrew the filter holder using the two 3/4” wrenches and remove the used filter.

8. Using a kimwipe clean the inside of the filter holder (do not use water or alcohol unless authorized).

9. Install a new filter out of the package. Be sure to install it the same way the old filter was removed.

10. Carefully align the filter holder pieces and screw together. Tighten with the 3/4” wrenches.

11. Repeat for the 2 remaining filters.

12. Cap the NO3/NH4/SO4 inlet and do a leak check.

13. Verify everything is in place in the NO3/NH4 inlet box, close and secure the cover.

14. At the PC, up the “NO3NH4” & “SO4” channels.

15. In TrackOps, close the “NO3/NH4/SO4 Inlet Filter Replacement” ticket.