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Page 7
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Maintenance
A133-99-880 Issue E
5
Maintenance
5.1
Replace the sorbent charge
During normal use, the sorbent material nearest to the port connected to the rotary pump will become brown in
colour. When the discolouration reaches the sorbent layer furthest from the port, you must change the sorbent
charge. The time taken for this to occur depends on the frequency of use and the location of the trap in relation to
the rotary pump. A typical charge life is six months, although Edwards recommends that you change the charge every
three months as a routine maintenance procedure.
1. Refer to
. Unscrew and remove the nut (1) and the lid (6).
2. Remove the basket (4) and spring (5) from the trap body (3).
3. Refer to
. Remove the wing nut (9) and end cap (1) from the basket (3). Remove the washer (10),
compression spring (8) and perforated end disk (7).
4. If the trap body interior appears oily or dirty, wash it out with isopropyl or ethyl alcohol and then dry it
thoroughly.
5. Fill the basket (3) with sorbent: refer to steps 4 to 9 of
.
WARNING
Activated alumina is a desiccant and will absorb materials from your process system. You must take
suitable precautions to protect people from the harmful effects of any noxious materials released
if you bake the spent alumina to reactivate it. Avoid inhalation of its dust, eye contact and
unnecessary skin contact.