Installation and Operation Safety 2
400/54 Premium Shielded NMR Magnet System Product Overview 27
General Safety — Potential Hazards
Handling cryogens (liquid helium and liquid nitrogen)
Vacuum hazards
For safety reasons, allow only personnel with formal training to
perform routine maintenance tasks involving the transfer of
cryogenic liquids.
Wear safety goggles, loose fitting nonabsorbent gloves, long
trousers, a long-sleeved shirt, and nonferrous safety footwear.
Ensure adequate ventilation and oxygen monitoring of the area
consistent with the volume of cryogens being used. If the oxygen
level in the room falls below 19.5%, do not allow personnel to
enter the area without self-contained breathing apparatus or
airline respirators.
Do not smoke. Ensure that other sources of ignition are not
present. Liquid oxygen can condense on cold surfaces and cause a
fire hazard.
Never measure the helium level by “dipping” or “thumping” the
helium can; always use the integral level probes in order to gauge
the volume of liquid remaining.
Keep cryostat exhaust ports free from blockages such as ice.
Ensure all safety devices (relief valves and drop-off plate) are
maintained in working order.
Do NOT tamper with any vacuum seals or attempt to unscrew
vacuum feed-through connections.
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