Emerson FB1100 Instruction Manual page 71

Appendix B: Special Instructions for Class I
Division 1 Locations
1.
2.
3.
4.
5.
DANGER
EXPLOSION HAZARD: Do not disconnect equipment unless power has been removed or the area
is known to be non-hazardous.
Special Instruction for Class I Division 1 Locations
The Emerson FB1100 Flow Computer is listed by Underwriters Laboratories (UL) as explosion
proof and is suitable for use in Class I, Division 1, Groups C and D hazardous locations or non-
hazardous locations. Read this appendix carefully before installing an Emerson FB1100 Flow
Computer. Refer to the other chapters of this manual for general information. In the event of
a conflict between the other chapters of this manual and this appendix, always follow the
instructions in this appendix.
The Emerson FB1100 Flow Computer includes both non-incendive and unrated field circuits.
Unless a circuit is specifically identified in this appendix as non-incendive, the circuit is
unrated. Unrated circuits must be wired using wiring methods as specified in
of the National Electrical Code (NEC), NFPA 70
specified in Section 18-152
DANGER
Though the Emerson FB1100 Flow Computer has a local port for local interrogation, it
should not be accessed with the cover removed in a Class I Division 1 area unless it has first
been verified that no flammable concentrations exist in that area. The local port may be
wired through a conduit, using seals, to an unclassified or Division 2 area.
All communication ports terminate on the terminal plate within the enclosure. Wiring to the
connectors is unrated. No connections may be made to communication ports unless the
user ensures that the area is known to be nonhazardous. Connections to the "Local Port" are
temporary and must be short in duration to ensure that flammable concentrations do not
accumulate while it is in use.
An RTD may be supplied with the Emerson FB1100 Flow Computer. Connection to the RTD is
approved as a non-incendive circuit.
Note
A bendable RTD (with a plastic bushing, as utilized in Division 2 installations) may not be
used in a Division 1 area as it renders the area non-explosion proof. Use an RTD connection
head and explosion-proof conduit for Division 1 installations.
I/O connections are unrated and must be wired using wiring methods as specified in
501-4(b) of the National Electrical Code (NEC), NFPA 70
as specified in Section 18-152
Emerson FB1100 Flow Computer Instruction Manual
for installations in the United States, or as
of the Canadian Electrical Code
of the Canadian Electrical Code
Article 501-4(b)
for installation in Canada.
for installations in the United States, or
for installation in Canada.
D301752X012
August 2020
Article
67