MBRAUN MB 120B-G, Operating Instructions Manual

Page: 42 / 105

Chapter 9: Circulation Mode
MBRAUN systems work by the principle of gas circulation, i.e. the working
gas permanently circulates between the glove box and the H
2
O/O
2
gas
purification system. This process guarantees absolutely stable values of
purity and a cost-efficient processing.
Caution!
When operating the Glove Box system the circulation mode
should be activated, only in this case is
it
continuously purified to
values of < 1 ppm with regard to H
2
O/O
2
.
The circulation mode is SPS-controlled and is operated and displayed via the OP17 Operation Panel.
When used for a long period in the circulation mode
,
the purification unit gets exhaus
t
ed
,
resulting in a
drop of the purification performance leading to increasing H
2
O/O
2
values. For this reason, the purifier column
should be regenerated regularly
,
or at
the very least,
when there is a visible drop in performance. Refer to chapter
10 “Regeneration“.
The circulation mode should be deactivated while the regeneration procedure is running.
In systems with 2 purifier columns
,
circulation mode can run via one purifier column while the other purifier
column is undergoing regeneration.
Having observed all preceding chapters.
All connections are properly made.
All antechambers are closed.
The Glove Box system has been purged.
The system is activated.
No regeneration of the purifier column.
Glove
Box
Ultra
pure gas
Gas from
box
Gas
purification
General information
Prerequisites
Chapter 9
Circulation Mode
43