
Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
3-2
BEFORE YOU INSTALL
The Rosemount 3490 Series Control Unit may be connected to a transmitter
located in a hazardous area. The Control Unit must not itself be located in a
hazardous area.
General considerations
•
Do not mount the Control Unit on a structure that is subject to vibration, or
in a position where damage may be caused by impact, thermal stress or
liquid ingress.
•
The fuse must only be replaced with the type specified.
•
If the equipment is likely to come into contact with aggressive substances,
it is the responsibility of the user to take suitable precautions that prevent
it from being adversely affected, thus ensuring that the type of protection
is not compromised.
Aggressive Substances - e.g. acidic liquids or gases that may attack
metals or solvents that may affect polymeric materials.
Suitable Precautions - e.g. regular checks as part of routine inspections or
establishing from the material's data sheet that it is resistant to specific
chemicals.
•
The user should not repair this equipment.
•
Terminal 30 (Intrinsically Safe Earth) of the Control Unit must be
connected to a High Integrity Earth.
•
A mains powered Control Unit must not be connected to a supply
exceeding 250V r.m.s. or dc, or to apparatus containing a source of
voltage exceeding 250V r.m.s. or dc.
•
A dc powered Control Unit must not be connected to a supply exceeding
30V dc, or to apparatus containing a source of voltage exceeding 30V dc.
•
The Intrinsically Safe outputs of the Control Unit may be connected to
certified equipment used in a hazardous area. Refer to Appendix B for
details of relevant certifications.
•
Refer to the technical data in Appendix A.
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