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Appendix B
5/20/2009
32
17.4.6.
Helium Scrubber Replacement
17.4.6.1.Close the inlet helium gas valve and back off the regulator
valve. [HIT RETURN WHEN DONE]
17.4.6.2.At this point the helium tank can also be replaced by
removing the regulator and installing a new tank.
17.4.6.3.To replace the helium scrubber carefully loosen the tube nut
with a 440 tube nut wrench, loosen the wing nuts and lift the
top assembly gently until the scrubber can be removed.
17.4.6.4.Repack the scrubber as described in 18.6.5.
17.4.6.5.Check the o-rings and effluent filters at this time. Make sure
any quartz wool fibers, which could prevent a good seal, are
removed from the outside of the scrubber before inserting.
17.4.6.6.Replace the tube, bring the top assembly down and tighten
the wing nuts. Tighten the lower nut ONLY. Very carefully
open the in-line valve and increase the helium gas pressure
to 5 psig. [HIT RETURN WHEN DONE]
17.4.6.7.Wait one minute. A tone will sound. A clock on the screen
counts down the time. When the tone sounds, the screen
displays the message: “I’m finished purging the helium
scrubber.” [HIT RETURN TO ACKNOWLEDGE]
17.4.6.8.Tighten the top nut on the helium scrubber. Increase the
pressure to normal. [HIT RETURN WHEN DONE]
17.4.6.9.Wait 5 minutes. This serves to purge the gas lines. Once the
5 minutes have passed, the Tube Replacement Menu for the
chosen analysis mode will be displayed.
17.4.6.10.
The instrument should be conditioned after replacing
the halogen scrubber by running two blanks before
proceeding to a sample run.
17.4.6.11.
If the helium tank has been replaced, purge the
regulator 5 times and run a helium blank profile to verify
good gas.
17.4.7.
Oxygen Scrubber Replacement
17.4.7.1.Close the inlet oxygen gas valve and back off the regulator
valve. [HIT RETURN WHEN DONE]
17.4.7.2.At this point the oxygen tank can also be replaced by
removing the regulator and installing a new tank.
17.4.7.3.To replace the oxygen scrubber carefully loosen the tube nut
with a 440 tube nut wrench, loosen the wing nuts and lift the
top assembly gently until the scrubber can be removed.
17.4.7.4.Repack the scrubber as described in 18.6.5.
17.4.7.5.Check the o-rings and effluent filters at this time. Make sure
any quartz wool fibers, which could prevent a good seal, are
removed from the outside of the scrubber before inserting.
17.4.7.6.Replace the tube, bring the top assembly down and tighten
the wing nuts. Tighten the lower nut
ONLY
. Very carefully