Installation and Operation Safety 2
400/54 Premium Shielded NMR Magnet System Product Overview 17
Nature of Liquid Cryogens
A superconducting magnet uses two types of cryogens: liquid
helium and liquid nitrogen. Helium is a naturally occurring,
inert gas that becomes a liquid at approximately 4K. It is
colorless, odorless, nonflammable, and nontoxic. In order to
remain in a superconducting state, the magnet is immersed
in liquid helium.
Nitrogen is a naturally occurring gas that becomes liquid at
approximately 77K. It is also colorless, odorless,
nonflammable, and nontoxic. It is used to cool the shield
that surrounds the liquid helium reservoir.
During normal operation, liquid cryogens evaporate and
require replenishment on a regular basis.
It
Cryogens are delivered to the site in Dewars; these Dewars,
including any carriers, must be nonmagnetic.
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