Analytical Industries GPR-1800 AIS ATEX Trace PPM Oxygen Analyzer - Manual (Page 46)

Advanced Instruments Inc.
46
Appendix G
Maintenance – H2S Scrubber
Servicing any of the H2S scrubbers will depend on several factors as illustrated in Appendix F and include: the (average) H2S
concentration (average), volume of scrubber media and flow rate through the scrubber (often times maximizing the service life
means longer system response time) see Appendix F.
Required equipment:
1. 2x 7/16” open end wrenches
2. 1x 9/16” open end wrench
3. 1x 1” open end or adjustable wrench
Procedure:
1. Separate the top connection to the scrubber using a 7/16” and the 9/16” open end wrenches on the two top nuts.
2. Hold the second nut with the 9/16” open end wrench.
3. With one of the 7/16” open end wrenches turn the top nut counter clockwise until the fitting disengages.
4. Separate the bottom connection to the scrubber using both 7/16” open end wrenches.
5. Hold the nut at the bottom of the scrubber with a 7/16” open end wrench.
6. With the other 7/16” open end wrench turn the nut below counter clockwise until the fitting disengages.
7. Carefully, do not loose the ferrules inside the fitting, remove the stainless tubing from the top and bottom of the scrubber.
8. Carefully pull the scrubber from its mounting clip which is attached to the back panel.
9. Once the scrubber is free, hold the scrubber with one hand and using the 1” open end or adjustable wrench with the other
hand, turn the 1” nut counter clockwise and remove the 1” nut at the top of the scrubber.
10. There is no need to remove the 7/16” fitting at the bottom of the scrubber.
11. With the 1” nut removed, empty the spent media through the opening.
12. Fill the scrubber with fresh media (should be rich purple in color).
13. Reverse the above steps to re-assemble and install the scrubber.
Maintenance – Coalescing Filter
Servicing the coalescing filter (P/N FLTR-1002-2) depends on the cleanliness and moisture content of the sample and
maintenance intervals.
Required equipment:
1. Channel locks
2. Damp rag
3. Lubricant (a thin coat applied to the o-ring after cleaning helps ensure a tight seal and extend o-ring life)
Procedure:
1. Unscrew the clear polycarbonate bowl by turning it counter clockwise.
2. Note: It is probably stuck tight – use the damp rag to grip if removing by hand or to prevent damage to the bowl if using
the channel locks.
3. The bowl seals to the head section with an o-ring, do not lose the o-ring.
4. The filter element screws into the head section, carefully turn it counter clockwise and remove.
5. Using the damp cloth, clean the inside of the bowl and the o-ring before reassembling – apply a very thin coat of lubricant
to the o-ring.
6. Reverse the above steps to re-assemble the filter.