40 (107) BRUKER CryoProbe User Manual
Standard procedures
VT setup 4.8
0
See "Sample temperature control" on page 55
for details on the sample tem-
perature setup.
Both N
2
gas and dry air can be used as VT gases. For a CryoProbe, there is no
difference between them with respect to shimming or RF performance.
CAUTION: Do not initiate a cool-down if no regulated VT gas flows. Do not
insert a sample if the CryoProbe is not at its operating temperature or if the tem-
perature in its sample cavity does not stabilize at the desired value.
Figure 4.11. Switching on the He Compressor
o.5
o.6
IMPORTANT: Unlike conventional probes, the sample tempera-
ture inside a CryoProbe must be actively maintained with the gas
flow and the heater switched on even if room temperature is
desired.
CAUTION: Failure to establish a VT gas flow prior to cool-down
will lead to extremely low temperatures in the sample cavity,
freeze the sample and possibly damage the CryoProbe.
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