Bruker NMR AVANCE NEO Systems, Руководство пользователя, Страница: 9 / 48

Introduction
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2.3.2 Safety precautions within the outer zone
The outer zone extends from the 1mT (10 Gauss) line to the 0.3 mT (3 Gauss) line. The
magnet's stray field does not get blocked by walls, floors or ceilings and the outer zone may
well encompass adjoining rooms. The stray field may erase information stored on magnetic
tapes or discs. Bank cards, security passes or any devices containing a magnetic strip may
be damaged. CD/DVD’s will not be damaged, although CD/DVD drives may contain magnetic
parts. When using pressurized gas cylinders made of steel, they should be located well
beyond the outer zone (preferably outside the magnet room) and must always be properly
fixed to the wall. Once beyond the outer zone any special precautions on account of the
magnet stray field are no longer necessary.
2.4 Cryogenic Safety
The magnet contains relatively large quantities of liquid helium and nitrogen. These liquids,
referred to as cryogens, serve to keep the magnet core at a very low temperature.
Because of the very low temperatures involved, gloves, a long sleeved shirt or lab coat and
safety goggles should always be worn when handling cryogens. Direct contact with these
liquids can cause frostbite. The system manager should regularly check and make sure that
evaporating gases are free to escape from the magnet, i.e. the release valves must not be
blocked. Do not attempt to refill the magnet with helium or nitrogen unless you have been
trained in the correct procedure.
Helium and nitrogen are non-toxic gases. However, because of a possible magnet quench,
whereupon the room may suddenly fill with evaporated gases, adequate ventilation must
always be provided.
2.5 Electrical Safety
The spectrometer hardware is no more or less hazardous than any typical electronic or
pneumatic hardware and should be treated accordingly. Do not remove any of the protective
panels or grounding measures from the various units. They are fitted to protect you and
should be opened by qualified service personnel only. The main panel at the rear of the
console is designed to be removed using two quick release screws, but again, this should
only be done by trained personnel. Please note that, unless disconnected, cooling fans on
the rear panel will continue to run even with the panel removed.
Before maintenance, repair or shipment, the system and/or its components must be
completely switched off and unplugged or disconnected and dismounted from the rack. Refer
to the individual component manuals for specific information.
2.6 Chemical Safety
Users should be fully aware of any hazards associated with the samples they are working
with. Organic compounds may be highly flammable, corrosive, carcinogenic etc.
2.7 CE Certification
All major hardware units housed in the AVANCE consoles as well as peripheral units such as
the magnet, HPPR, shim systems, probe and cooling devices comply with the CE Declaration
of Conformity. This includes the level of any stray electromagnetic radiation that might be
emitted as well as standard electrical hazards. Note that to minimize electromagnetic
radiation leakage, the doors of the console should be closed and the rear paneling mounted.