Bruker 300'89 Ascend, User Manual

Page: 42 / 100

42 ZTKS0168 / Z31960 / 05
Troubleshooting
6.2.3 During Cooling Procedure
a. See note on previous page.
Indicator Possible reason Solution Performed by
Cooling with liquid
nitrogen is too
slow. Empty transporta-
tion dewar. Refill or replace transporta-
tion dewar. Bruker Service
Transfer pressure
too low. Increase transfer pressure
slightly (max. pressure
0.3 bar). Bruker Service
Transportation
dewar is leaky; no
transfer pressure
can be applied. Check transportation dewar
and replace if necessary. Bruker Service
Precooling with
liquid nitrogen
occurs too quickly. Transfer pressure
too high. Stop cooling. Adjust correct
transfer pressure. Bruker Service
Vacuum in RT
vessel does not
reach
5 x 10
-5
mbar
within 48 hours.
O-rings are leaky. Check and clean O-rings
and slots. If necessary,
replace the O-rings for
• the vacuum valve
• the drop-off plate
• the reduction and
sealing flanges
• the bottom plate
a
.
Bruker Service
O-rings are frozen
due to contact with
liquid nitrogen.
1. Stop cooling.
2. Warm O-rings with
warm air.
3. Wait until the vacuum is
recovered.
4. Prevent liquid nitrogen
from splashing on
O-rings.
Bruker Service
Pumping unit or
pumping line is
defective. Check pumping unit and
pumping line:
A vacuum of at least
10
-6
mbar must be reached
while the sealing plug is
closed.
Replace if necessary.
Bruker Service