Agilent Technologies 400/54 Premium Shielded NMR Magnet System, System Overview

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28 400/54 Premium Shielded NMR Magnet System Product Overview
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Installation and Operation Safety
Magnetic field
Air quality
WA R N I N G
Siting of the magnet must be consistent with local legislation on
allowable levels of stray magnetic field.
Do not allow people with heart pacemakers or metallic body
implants within the vicinity of the magnet (within the 5G (0.5 mT)
line).
Keep gas cylinders away from the magnet (outside the 5G (0.5
mT) line).
Keep all other large ferromagnetic objects away from the magnet.
Use steel tools near the magnet only with great care and when
nonmagnetic alternatives are not available.
Due to the nature of shielded magnets, there are very high field
gradients close to the magnet. These fields are particularly high at
the ends of the bore tube (for example, directly underneath and on
top of vertical magnets, and at each end of horizontal magnets).
In the rare event of a magnet quench, it is possible for the
magnetic field to bloom momentarily beyond its normal limit,
attracting ferromagnetic objects towards the magnet. For this
reason, do not place or store ferromagnetic objects within 1 meter
of the cryostat.
C A U T I O N
Keep all forms of magnetic storage media outside the 10G (1 mT)
line, including credit cards, computer hard disks, and floppy disks.
Mechanical watches are also at risk.
WA R N I N G
Maintain adequate ventilation of the room in which the system is
located.
See “Handling cryogens (liquid helium and liquid nitrogen) ” on
page 27.
Oil mist from rotary vane vacuum pumps is a potential health
hazard: vent the exhaust from pumps to the outdoors. Make sure
any flexible hoses used for this purpose are kink-resistant and
have a push-on engagement with the exhaust port of the vacuum
pump. (Do not clamp hoses onto pumps.)