Maintenance 3
400/54 Premium Shielded NMR Magnet System Product Overview 45
Figure 11 Inserting transfer line into the top seal of the Dewar
10 After the siphon precool is complete and helium liquid is
issuing from the phase separator, remove the helium
nonreturn valve from the manifold.
11 Remove the fill side bung and baffle assembly, and insert
the siphon and adapter assembly, screwing down the nut
to ensure a good compression seal.
Failure to precool the siphon can quench the magnet as the warm
siphon is inserted into the helium can. If the siphon is suspected to
be soft or have a touch, do not insert into the helium can, as it can
also cause the magnet to quench.
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