Lake Shore Cryotronics 1015, Руководство пользователя

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Lake Shore Model 1015 User’s Manual
B-2 Handling LHe & LN
2
WARNING: Liquid helium and liquid nitrogen can cause severe
frostbite to the eyes or skin. DO NOT touch frosted pipes or valves. In
case of frostbite, consult a physician at once. If a physician is not
readily available, warm the affected areas with water that is near body
temperature.
The two most important safety aspects to consider when handling LHe and
LN
2
are adequate ventilation and eye and skin protection. Although helium
and nitrogen gases are non-toxic, they are dangerous in that they replace
the air in a normal breathing atmosphere. Liquid products are of an even
greater threat since a small amount of liquid evaporates to create a large
amount of gas. Therefore, it is imperative that cryogenic dewars be stored
and operated in open and well ventilated areas.
Persons transferring LHe and LN
2
should make every effort to protect eyes
and skin from accidental contact with liquid or the cold gas issuing from it.
Protect your eyes with full face shield or chemical splash goggles. Safety
glasses (even with side shields) are not adequate. Always wear special
cryogenic gloves (Tempshield Cryo-Gloves® or equivalent) when handling
anything that is, or may have been, in contact with the liquid or cold gas, or
with cold pipes or equipment. Long sleeve shirts and cuffless trousers that
are of sufficient length to prevent liquid from entering the shoes are
recommended.
B5.0 RECOMMENDED FIRST AID
Every site that stores and uses LHe and LN
2
should have an appropriate
Material Safety Data Sheet (MSDS) present. The MSDS may be obtained
from the manufacturer/distributor. The MSDS will specify the symptoms of
overexposure and the first aid to be used. A typical summary of these
instructions is provided as follows.
If symptoms of asphyxia such as headache, drowsiness, dizziness,
excitation, excess salivation, vomiting, or unconsciousness are observed,
remove the victim to fresh air. If breathing is difficult, give oxygen. If
breathing has stopped, give artificial respiration. Call a physician
immediately.
If exposure to cryogenic liquids or cold gases occurs, restore tissue to
normal body temperature (98.6 °F) as rapidly as possible, then protect the
injured tissue from further damage and infection. Call a physician
immediately. Rapid warming of the affected parts is best achieved by
bathing it in warm water. The water temperature should not exceed 105 °F
(40 °C), and under no circumstances should the frozen part be rubbed,
either before or after rewarming. If the eyes are involved, flush them
thoroughly with warm water for at least 15 minutes. In case of massive
exposure, remove clothing while showering with warm water. The patient
should not drink alcohol or smoke. Keep warm and rest. Call a physician
immediately.