Lake Shore Cryotronics 121, Руководство пользователя

Страница: 57 / 62

47
Liquid helium and liquid nitrogen are potential
asphyxiants and can cause rapid suffocation without
warning. Store and use in area with adequate ventila-
tion. DO NOT vent container in confined spaces. DO
NOT enter confined spaces where gas may be present
unless area has been well ventilated. If inhaled,
remove to fresh air. If not breathing, give artificial
respiration. If breathing is difficult, give oxygen. Get
medical help.
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 physi-
cian 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 cre-
ate a large amount of gas. Therefore, it is imperative that cryogenic Dew-
ars be stored and the MTD system be 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 gog-
gles. 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.