EGM-5 Operation Manual V. 1.04 120 support@ppsystems.com
Absorber Column and CO
2
Scrubber
The absorber column is located on the rear of the EGM-5 enclosure. It can easily be removed from the
instrument by gripping it around the middle of the column and gently pulling it out of its manifold.
Periodically inspect the following:
Gray Foam Filters
The gray foam filters used inside the absorber column (top and bottom) will wear over time and should be
inspected regularly and replaced when torn or reduced in size. The foam must be of an open celled type,
such as packing foam. The foam filters at the bottom of each column will likely require more frequent
changes versus the upper foam filters.
Absorber Filters
Each absorber end cap contains a white plastic filter disk. Generally these do not need to be replaced but
should be checked periodically. However, they must be present to prevent any of the column contents
being drawn with the gas stream causing damage to the instrument.
End Cap “O” Rings
Each end cap has two “O” rings, one that seals inside the plastic column and another that seals at the
manifold. All “O” Rings on the absorber column should periodically (every couple of weeks) receive a
slight smear of silicone grease to aid ease of fitting, improve the seal and extend the life of the “O” rings
and to keep them from cracking or breaking. Once sealed, end fittings should be checked to ensure that
the O-rings are seated correctly in their groove and that they are not trapped or pinched resulting in
system leaks.
Soda Lime (CO
2
Scrubber)
Soda lime is used as a CO
2
scrubber and it will exhaust over time. Soda lime can be “self-indicating” or
“non-indicating”. Both types work with the EGM-5. If using “self-indicting” Soda lime it is best to change
when it is 2/3rds exhausted. If using “non-indicating” Soda lime you should be more cautious and change
it out when the CO
2
scrubber percentage reaches 20% or less (See Soda Lime (CO
2
Scrubber) on page
24.
Soda Lime cannot be regenerated and should be discarded after exhaustion.
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