Maintenance 3
400/54 Premium Shielded NMR Magnet System Product Overview 35
Cryostat Maintenance
General maintenance
Regular maintenance tasks are essential for the efficient and
reliable operation of this system. These tasks generally
include checking cryogens, making sure that the system is
leak- tight, and checking that none of the parts are worn or
damaged. A routine maintenance schedule is recommended.
Daily
• Check flow- rates and note cryogen levels to see whether
refills are required. If a manostat is not fitted to the
system, flow rates depend on atmospheric pressure
changes. Average flow rate is achieved over longer periods
of time (for example, one week).
Weekly
• Check that all safety valves are free and are not iced- up.
• Check that all seals are air- tight, especially after a helium
top- up.
• Check that the cryogen levels in the log are consistent
(dropping regularly). If ice develops on the helium probe,
a false reading can occur, and the level will cease to drop.
If this is suspected, contact Agilent Technologies for
advice.
Monthly and annually (for systems with fitted quench ducting)
• Check monthly that quench ducting (where fitted) remains
unobstructed.
• Check at least annually that the burst disk is intact.
Replace if necessary.
During/after every nitrogen fill
• Check the o- rings on the accessories fitted to the nitrogen
turrets for wear and tear. If they become excessively worn
or broken, replace them.
During/after every helium fill
• Check the o- rings on the bung and baffle assembly for
wear and tear. If any sign of wear is seen, replace the
o- ring.
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