Agilent Technologies Cryogenic User Manual page 10

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Introduction
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10
gasses from the top of the dewar), leave the area
immediately. Sudden release of helium or nitrogen gases can
rapidly displace oxygen in an enclosed space creating a
possibility of asphyxiation. Do not return until the oxygen
level returns to normal.
Avoid helium or nitrogen contact with any part of the body.
In contact with the body, helium and nitrogen can cause an
injury similar to a burn. Never place your head over the
helium and nitrogen exit tubes on top of the magnet. If
helium or nitrogen contacts the body, seek immediate
medical attention, especially if the skin is blistered or the
eyes are affected.
Do not look down the upper barrel.
Unless the probe is removed from the magnet, never look
down the upper barrel. You could be injured by the sample
tube as it ejects pneumatically from the probe.
Do not exceed the boiling or freezing point of a sample during
variable temperature experiments.
A sample tube subjected to a change in temperature can
build up excessive pressure, which can break the sample
tube glass and cause injury by flying glass and toxic
materials. To avoid this hazard, establish the freezing and
boiling point of a sample before doing a variable temperature
experiment.
Support the magnet and prevent it from tipping over.
The magnet dewar has a high center of gravity and could tip
over in an earthquake or after being struck by a large object,
injuring personnel and causing sudden, dangerous release of
nitrogen and helium gasses from the dewar. Therefore, the
Cryogenic Systems Operation