Bruker 500'89 Ascend Aeon, User Manual

Page: 45 / 100

45 ZTKS0172 / Z31964 / 04
Troubleshooting
Table continued
Indicator Possible reason Solution Performed by
The cooling of the
magnet coil does
not continue
although helium is
transferred. The helium transfer
line is defective. Check the helium transfer
line for ice. If there are cold
spots visible, replace the
helium transfer line. Bruker Service
The extension
piece is not
mounted on the
helium transfer line. Mount the extension piece
on the helium transfer line.
Check the helium transfer
line is completely inserted
into the siphon. Bruker Service
The zero reading of
the Helium Level
Sensor can not be
adjusted at the
beginning of
cooling with liquid
helium. The Helium Level
Sensor is not
connected correctly
with the connector
in the helium flow
system. Check the connection in the
helium fill-in turret between
Helium Level Sensor and
connector. Bruker Service
The Helium Level
Sensor is defective. Check the Helium Level
Sensor using the 0 %
calibration plug. Bruker Service
The helium level
does not reach
100 % after
cooling. Empty transpor-
tation dewar,
helium transfer
stopped. Refill or replace transporta-
tion dewar. Bruker Service
The Helium Level
Sensor is disturbed
by the transfer
line’s extension
piece.
1. Stop the liquid helium
transfer.
2. Remove the transfer line.
3. Wait for a few minutes.
4. Measure the helium level
to check the Helium
Level Sensor is working
correctly.
Bruker Service
After cooling the
rate of helium boil
off is higher than
specified (up to
5 times). Usual behavior.
A few days are
necessary for the
radiation shields
and the insulation
to reach scheduled
temperatures.
Wait a few days and check
helium boil off.
The presence of the current
lead in the current lead turret
during energizing and
shimming helps cooling the
radiation shield due to
higher helium flow.
Bruker Service