89
ZTKS0156 / Z31820 / Rev.: 03
Troubleshooting
Continued from page before
Indicator Possible reason Solution By
Helium bore tube
and radiation shield
are not concentric.
Alignment rod is
loose or broken.
Replace alignment rod
a
.
Bruker Service
Reduction flange is
not concentric.
Check orientation. Bruker Service
Vacuum valve
collides with the
magnet stand.
Vacuum valve
collides with the
magnet stand.
Turn the vacuum valve. Be
careful if the RT vessel is
evacuated.
Bruker Service
Vacuum in RT vessel
does not reach
5x10
-8
bar within
48 hours.
O-rings may be
damaged.
Check and clean O-rings and
slots; replace O-rings if
necessary:
• of the vacuum valve
• of the drop-off plate
• of the reduction and
sealing flanges
• of the bottom plate
a
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Defective pumping
line.
Check pumping line between
the cryostat and vacuum
pumping unit; change if
necessary.
Bruker Service
Defective pumping
unit.
Check pumping unit:
A pressure below 1 x 10
-9
bar
must be reached with a
closed sealing plug.
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Room temperature
bore tube has scrat-
ches or dust on the
sealing surfaces.
Check sealing surfaces on the
room temperature bore tube:
No scratches and no dust
should be visible.
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Moisture within the
RT vessel.
Pump and flush the RT vessel
several times with dry nitro-
gen gas.
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Super insulation
touches RT vessel or
bore tube or
radiation shield.
Super insulation was
not fixed correctly
during assembly.
Fix super insulation on the
outer radiation shield with
polyester tape
a
. Carefully
prevent any connection
between different vessels or
bore tubes in the cryostat.
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a. For this work the bottom plate has to be removed. Check the suspension tubes of the helium vessel
are not broken. Install the safety device for fall protection (not supplied). Contact Bruker Service
Headquarter for further information.
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