NO3/NH4 CH1 KCL Filter Replacement

Purpose: Replace the KCL impregnated filter on CH1 in the NO3/NH4 inlet box.

Required Equipment: KCL impregnated filter,

9/16” wrench

Two sets of 1/4” ferrules,

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

Changing the NO3/NH4 CH1 KCL Filter

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

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

3. Locate the KCL Filter on CH1 – it is a small blue Balston filter with a label for KCL impregnation.

4. Remove the filter using the 9/16” wrench.

5. Using a pair of pliers or the 9/16” wrench to snap off the two ends of the filter to collect the 1/4” nuts.

6. Install a new, KCL impregnated filter using the 1/4” nuts collected and new 1/4” ferrules.

7. Be sure to install it the same way the old filter was removed.

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

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

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

11. In TrackOps, close the “NO3/NH4 CH1 KCL Filter Replacement” ticket.