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Emerson Process Management GmbH & Co. OHG 4-35
X-STREAM X2
Instruction Manual
HASX2E-IM-HS
02/2012
4
Installation
On-site conditions often differ from test
environments and may require special pre-
cautions. Such a case arises when strong
electromagnetic elds which could induce
an interference current in the shielding. This
type of current creates a potential difference
between the connected housings.
Two possible methods of eliminating this are
described here. Fitters familiar with EMC
problems must decide which method should
be emplyed.
• The shielding is connected only at one
end (connecting to the analyzer is re-
commended): this gives better protection
against external interference, and inter-
ference currents are prevented because
the ground loop is interrupted.
• Cables with double shielding are used: in
this case, one shielding is connected to
the analyzer housing, the other shielding
to the external device. This is advan-
tageous when both units are supplied
from different grids (e.g. when installed
in different buildings).
This method is more expensive, but gi-
ves the best protection against external
interference and against interference
currents
.
Fig. 4-27: Shielded signal cable, shielding connected at one end.
Fig. 4-28: Signal cable with double shielding, shieldings connected at alternate ends.
4.7 Installation - Notes on Wiring