Bruker 600'54 Ascend ULH, User Manual

Page: 53 / 102

53 ZTKS0175 / Z31991 / 03
Troubleshooting
6.3 Troubleshooting Work
6.3.1 After a Quench
Quench while in persistent mode:
1. Wait until the quench valves are closed and no helium evaporates out of the quench
valves.
2. Wait until there is no helium vapor visible in the room or the ceiling to make sure
there is sufficient oxygen in the room.
3. If equipped with switch the Atmospheric Pressure Device OFF.
4. Check the globes in the quench valves for their correct position.
5. Only at magnet systems with 3 helium turrets: check the bursting disc at the helium
flow system. If destroyed close the socket with the supplied plug to prevent air from
entering the helium flow system or vessel.
6. Remove probe and shim system to prevent icing of the shim system.
7. Check the nitrogen turrets for icing.
8. Start the refill with liquid helium as soon as possible after the quench (within one
hour after the quench; refer to the supplied Refilling Procedure).
9. Contact Bruker Service immediately.
Figure 6.1: Quench Picture
A quench is the very fast de-energizing of
the magnet by loss of its superconductivity.
The stored magnetic energy is converted
into heat, which promotes rapid evapora-
tion of large quantities of helium.
After an appearance of a quench contact
Bruker Service immediately.
WARNING
Cryogenic Agents (see page 19 )
Quench (see page 20 )