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3.1
PRECAUTION FOR OPERATION
Read these general precautions before operating the instrument.
CAUTION
• Liquid samples, samples whose volume changes (such as between the
solid and liquid states) when due to a change in temperature, and sub-
limating materials cannot be measured.
Scattering the sample or bolts for the spinning cap occurs due to a change in volume
caused by the expansion of the sample. Both of these events destroy the probe.
• When you perform VT (Variable Temperature) measurement, be sure to
flow bearing gas.
If you do not flow the bearing gas, the heater produces anomalous heating then a fire
might occur inside the probe.
• When you set the measurement temperature to 150 ℃ or more, be sure
to use nitrogen gas.
If air is used, a flammable sample may ignite and fires might occur inside the probe.
Moreover, the surface of the heater that is built into the probe would oxidize and the
oxide would block a pipe, causing failure. The NMR detection coil would also oxi-
dize and performance of the probe would deteriorate.
Nitrogen gas
When you use nitrogen gas, check that the specification of the source of nitrogen meets
the needs of the probe.
Insertion and removal of a sample tube
When you remove a sample tube from the probe, be sure to use the removal tool.
If stress is applied to the stator during sample exchange, the magic angle and the resolu-
tion will change.
Probe tuning
After you change an observation nucleus or replace a sample, you must perform the probe
tuning. If you do not, the signal and noise ratio might degrade because the observation
condition might change. For details on tuning, refer to the manual of the individual probe.
Magic-angle spinning (MAS)
When you perform a magic-angle spinning, use a MAS controller or High-precision
regulator.
NMECAXS_V50-SLD-2
• When you use nitrogen gas, provide ventilation sufficient
for the rate of gas usage.
When ventilation is insufficient, the danger of asphyxiation will be
present. Moreover, when using nitrogen gas, in order to avoid un-
expected accidents, be sure to provide an oxygen alarm.
3 SETTING OF INSTRUMENT CONDITIONS
WARNING
3-1
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