Maintenance 3
Maintenance 53
a
Pass the transfer line tubing end through the SilTite
ferrule leaving approximately 1 cm of tubing protruding
beyond the ferrule. Thread the pre- swaging tool onto
the nut (Figure 34) with the tubing protruding through
the tool.
b Using a wrench and ferrule pre- swaging tool tighten
the nut a little at a time, occasionally checking to see
if the ferrule is gripping the tube. When the ferrule
just starts to grip, notice position of the nut and then
tighten by turning 45 to 60 degrees of rotation, but no
more than 60 degrees (one flat). If you can pull the
transfer line tubing free, it is not tight enough.
Figure 34 Volatiles interface nut and pre-swaging tool (G4556-67018)
c Remove the pre- swaging tool.
d Using a ceramic column cutter, trim the tubing at the
small end of the ferrule leaving approximately 0.3 mm
of tubing extending beyond the ferrule.
It is important that the tube end does not extend
beyond 0.5 mm from the end of the ferrule.
e Check the end of the tube with a magnifier. The end of
the tube need not be perfectly square, but should not
have cracks which extend under the ferrule.
7 Screw the nut onto the volatiles interface.
8 Establish a flow of carrier gas through the transfer line
and check for leaks. If the transfer line nut leaks, tighten
an additional 1/8 turn with the supplied wrench. Purge as
recommended by the column manufacturer.
9 Heat the volatiles interface to operating temperature.
10 Retighten the fittings, if necessary.
The SilTite ferrules are delicate. Follow the instructions in the next
steps very carefully to avoid overtightening.
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