6. POST-CONDITIONING
1. Once the purifier is conditioned with a process gas, it must
be left under pressure of that gas. If the process gas is
subsequently purged with an inert gas, a second conditioning
with the process gas may be required prior to re-use with the
same process gas.
2. Conditioning may be required also if the process gas blend is
replaced with a gas blend of different concentration. If a purifier
in use with hydrides or gas blends has been out of service for
an extended time, a purge of the purifier with 20 bed volumes
(refer to Table 4, Product column) of the process gas is
recommended.
3. DO NOT subject the purifier to a vacuum if material is conditioned
with a toxic or corrosive gas. Release of toxic or corrosive gases
may result under vacuum.
4. A purifier conditioned for a particular process gas must be used
for that process gas only. The purification material is gas specific.
WARNING:
1. If a purifier has been conditioned with any gas other than an inert gas,
then it must be assumed that the effluent will always contain some
level of the conditioning gas (
e.g.
when a purifier is purged with inert
gas prior to its removal from service).
2. Release of toxic or corrosive gases may result if care is not taken to
contain or dispose of these gases properly.
