Floor Plan
H157654_9_011 85 / 120
9.8 Maximum Field Strengths for NMR Equipment
Once the location of the magnet has been decided, it is time to determine where the remain-
der of the equipment will be placed. Protection of motors and electronics from magnetic fringe
fields is crucial.
Unit Maximum Field Strength
AVANCE NEO cabinet 1.0 mT (10 G) line
BCU-I 5.0 mT (50 G) - max. 2.7m from magnet center
BCU-II 5.0 mT (50 G) - max. 2.7m from magnet center
LCD computer monitor* 1.0 mT (10 G)
Computers e.g. NMR workstation, PC 0.5 mT (5 G)
Printer, plotter 0.5 mT (5 G)
CryoProbe system components (e.g. He
compressor, He steel cylinder and its
transport path)
0.5 mT (5 G)
CryoCooling unit 5.0 mT (50 G)
Gas cylinders 0.5 mT (5 G)
Heavy metal office furniture e.g. filing
cabinet**
0.5 mT (5 G) - not recommended in magnet
room
Movable metal chair Not recommended in magnet room
* The working place for personnel should be outside the 0.5 mT (5 G) line. An additional
LCD monitor and keyboard can be located at the 1.0 mT (10 G) line for probe adjust-
ments etc.
** Use wooden furniture if access during critical measurements is required.
Table9.5: Maximum Field Strength for NMR Equipment
9.9 Cabinet Position
The various units within the AVANCE NEO cabinet, especially the acquisition computer, must
be kept at a minimum distance from the magnet. Protection of the acquisition computer and
digital electronics from the magnet’s fringe field is best achieved by positioning the cabinet so
that the acquisition computer is no closer than the 1.0 mT (10 G) line. Any ancillary cabinets
such as microimaging must also be placed outside the 1.0 mT (10 G) line. To allow adequate
ventilation for the cabinet, it must be positioned no closer than 30 cm from the back of the
cabinet to any walls. For service access to the rear, there must be sufficient space for the
cabinet to be pulled out from the wall.For ease of cabling, locate electrical outlets and com-
pressed air supply close to the rear of the cabinet.
9.10 Worktable Position
Magnetic storage devices are sensitive to the fringe field and attention must be given to their
position relative to the magnet.
• The workstation and additional disks, are normally placed on the worktable, and should
not be exposed to fields greater than 1.0 mT (10 G).
• For convenience of operation, no direct light should fall on the LCD panel, nor should
there be a strong light source at the back of the panel. A separate dimmer or at least par-
tial switching is recommended for the lights in the worktable area.
To Next Page
Loading...
Need help?
General
