44
ZTKS0164 / Z31949 / 06
Troubleshooting
Table continued
Indicator Possible reason Solution Performed by
Nitrogen ice in the
helium vessel.
Times between
pumping and
flushing were too
long. Nitrogen
boiled off during
pumping and
remaining nitrogen
got frozen during
flushing.
1. Warm the magnet coil
with warm helium gas
by using the precooling
tube until the whole coil is
at 90 K or above.
2. Repeat pumping and
flushing.
3. Use the dipstick to check
that the helium vessel is
empty (no liquid nitrogen
or frozen nitrogen).
Bruker Service
Transfer of liquid
helium does not
start.
The transportation
dewar is empty.
Refill or replace transporta-
tion dewar.
Bruker Service
The transfer
pressure in the
transportation
dewar is too low.
Increase the transfer
pressure.
Bruker Service
The transportation
dewar is leaky, no
transfer pressure is
built up.
Check the transportation
dewar for leakage.
Re-tighten all connections.
Bruker Service
The siphon or the
helium transfer line
are blocked with
ice.
Check the siphon and
helium transfer line for
blockages. Remove ice with
warm helium gas.
Bruker Service
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