Bruker AVANCE NEO - Magnetic Fringe Fields

Magnetic Fringe Fields
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6 Magnetic Fringe Fields
Magnetic fringe fields are three dimensional, and extend further in the vertical direction than
in the horizontal direction.
A number of studies have been carried out on the long term effects of magnetic fields on
personnel. As a general rule the working place (e.g. workstation, sample preparation area
etc.) must be placed outside the 0.5 mT (5 G) line. For further information on acceptable
magnetic field limits contact your countries health authorities or your area Bruker office.
Various devices are affected by the magnet and must be located outside the limits specified
in the following section. For comparison the earth’s magnetic field is 0.05 mT (0.5 G).
Please note that when more than one magnet is located in a room the 0.5 mT (5 G) line from
each magnet should not overlap.
Fringe Field
Distances
Device Effects
200 mT (2000 G) All devices should be outside this line. Refer to current standards on
health and safety (e.g. BGV B11 in the European Community) in the
workplace for specifications on how long personnel may remain within
this area.
5 mT (50 G) Magnet power supply, RF
power amplifier, Cryo-cooling
platform.
Electrical transformers which are a
component of many electrical de-
vices may become magnetically sat-
urated in fields above 50 Gauss (5
mT). The safety characteristics of
equipment may also be affected.
3 mT (30 G) Metallic parts. Attraction and projectile risk in the
fringe field of high field strength
sources (> 100mT).
2 mT (20 G) Magnetic storage material The information stored on tapes may
be destroyed or corrupted.
1 mT (10 G) Computers, X-ray tubes, credit
cards, bank cards, watches,
clocks, cameras, TFT com-
puter monitor.
The magnetically stored information
in computers and credit cards may
be corrupted in fields greater than 1
mT (10 G). Small mechanical de-
vices such as watches or cameras
may be irreparably damaged. (Digital
watches may be worn safely).
0.5 mT (5 G) Pacemakers, Medical Im-
plants Cathode Ray tubes,
CryoProbe compressor.
Magnetic fields greater than 0.5
mT (5 G) will deflect a beam of
electrons leading to a distortion of
the screen display.
0.1 mT (1 G) Only very sensitive electronic equipment such as image intensifiers,
nuclear cameras and electron microscopes will be affected.
Table6.1: Effects of Magnetic Fields on Equipment