Bruker RS, Service Manual, Page: 47 / 157

47 ZTKS0156 / Z31820 / Rev.: 03
Assembling
Bottom of the Cryostat
Figure 4.20: Assembling the RT Tube - step 3
9. Check the alignment of the nitrogen tube
and the lower RT reduction flange with a
view through the nitrogen tube from the top.
If the alignment is not correct, remove the
lower RT reduction flange and adjust the
alignment with the three lower alignment
rods (loosen/tighten).
10. Insert the lower RT closure flange (1) to the
RT reduction flange (2). Check the index.
The lower RT closure flange can be inserted
in only one position.
11. Fix it with only three of the six M5 x 12
screws.
Figure 4.21: Assembling the RT Tube - step 4
12. Clean the RT tube carefully with ethanol.
Prevent any contamination (finger prints, dirt
e.g.) to the RT tube surface by using clean
gloves. Prevent any damage (scratches,
buckling) to the RT tube by handling it
carefully.
13. Insert the RT tube from the top.
In case the RT tube is insulated handle it
carefully and prevent damage to the insula-
tion.
In case the RT tube is not symmetrical
respect the correct position. Align the marks
at the inner side of the RT tube with the
mark at upper RT reduction flange.
Figure 4.22: Assembling the RT Tube - step 5
14. Clean the O-ring of the lower RT closure
flange with ethanol.
15. Grease the O-ring with vacuum grease.
16. Carefully remove the lower RT closure
flange. Secure the RT bore tube against
falling down.
17. Check the O-ring slot at the lower RT
closure flange and clean it with ethanol.
Remove scratches, if necessary.