Bruker AVANCE User Manual

Magnetic Stray Fields
H157655_1_008 39
6 Magnetic Stray Fields
Magnetic stray 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.
Stray 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
devices may become magnetically
saturated in fields above 50 Gauss
(5 mT). The safety characteristics of
equipment may also be affected.
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 computer
monitor.
The magnetically stored information
in computers and credit cards may
be corrupted in fields greater than 1
mT (10 G). Small mechanical
devices such as watches or cameras
may be irreparably damaged.
(Digital watches may be worn
safely).
0.5 mT (5 G) Pacemakers, Medical
Implants 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
The accompanying tables in this chapter display the horizontal stray fields in the radial,
direction, as well as, the vertical stray field in the axial direction.

Bruker AVANCE Specifications

General

Brand	Bruker
Model	AVANCE
Category	Laboratory Equipment
Language	English