Analytical Industries GPR-1800 IS ATEX Trace PPM Oxygen Transmitter - Manual (Page 50)

Advanced Instruments, Inc
50
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, 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:
Separate the top connection to the scrubber using a 7/16” and the 9/16” open end wrenches on the two top
nuts.
Hold the second nut with the 9/16” open end wrench.
With one of the 7/16” open end wrenches turn the top nut counter clockwise until the fitting disengages.
Separate the bottom connection to the scrubber using both 7/16” open end wrenches.
Hold the nut at the bottom of the scrubber with a 7/16” open end wrench.
With the other 7/16” open end wrench turn the nut below counter clockwise until the fitting disengages.
Carefully, remove the stainless tubing from the top and bottom of the scrubber.
Carefully pull the scrubber from its mounting clip which is attached to the back panel.
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 from the scrubber.
There is no need to remove the 7/16” fitting at the bottom of the scrubber.
With the 1” nut removed, empty the spent media through the opening.
Fill the scrubber with fresh media (should be rich purple in color).
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:
Channel locks
Damp rag
Lubricant (a thin coat applied to the o-ring after cleaning helps ensure a tight seal and extend o-ring life)
Procedure:
Unscrew the clear polycarbonate bowl by turning it counter clockwise.
Note: It is probably stuck tight – use a damp rag to grip if removing by hand or to prevent damage to the
bowl if using the channel locks.