Warm-up
CryoProbe User Manual BRUKER 49 (107)
Warm-up 4.14
0
WARNING: Do not disconnect any tube or cable from a running CryoProbe Sys-
tem unless
UNPLUG lights up on the CryoCooling Unit front panel. Pressurized
cryogenic helium gas is circulated between CryoProbe, CryoCooling Unit, and He
Compressor. It could cause cold burns on unprotected eyes and skin when tubes
are disconnected during operation.
Warming-up the CryoProbe is usually not necessary. It can run without interrup-
tion for up to 10 000 h (the limit is actually set by the mechanical wear inside the
CryoCooler). A warm-up is required only if
- requested by the CryoController (see "
Warm-up needed soon request"
on page 63),
- the CryoProbe should be removed from the magnet,
- the CryoCooling Unit is going to be moved,
- there are no NMR measurements to be done for at least a week.
If in doubt, leave the CryoProbe running in its cold state.
Removal 4.15
0
Insertion and removal of the heavy CryoProbe (~12 kg) can be easily accom-
plished by the spectrometer operator with the help of a second person.
WARNING: Do not attempt to insert or remove the heavy CryoProbe (~12 kg) at
the magnet without the help of a second person. Because your body’s posture is
unfavorable when kneeling down below a magnet, you may easily injure your
back when lifting the CryoProbe on your own!
CAUTION: Never attempt to remove a CryoProbe from the magnet when cold. Al-
ways wait until it has reached room temperature because the CryoProbe or the
He Transferline may be damaged when moved cold.
Table 4.10. Warm-up
step action
w.1 Terminate NMR experiment and eject the sample.
CAUTION: Keep the VT unit operating even without a sample!
w.2 Press the
WARM UP button on the front of the CryoCooling Unit. Its light
will be steady on then. The He Compressor stops immediately but re-
starts after ~ 2 min. No periodic hiss is audible during warm-up.
w.3 Wait until green light W
ARM comes on.
CAUTION: Do not enforce a warm-up by any additional means of
external or internal heating!
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