UL Safety Instructions for Emerson FB1100 Flow Computers
CD9434A
December 19, 2022
UL-4 Special Instructions for Class I Division 1 Locations
Special Instructions for Class I Division 1
Locations
1.
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 document carefully before installing an Emerson FB1100 Flow
Computer. Refer to the Emerson FB1100 Flow Computer Instruction Manual (D301752X012) for
general information. In the event of a conflict between D301752X012 and this document,
always follow the instructions in this document.
2.
The Emerson FB1100 Flow Computer includes both non-incendive and unrated field circuits.
Unless a circuit is specifically identified in this document as non-incendive, the circuit is
unrated. Unrated circuits must be wired using wiring methods as specified in Article 501-4(b)
of the National Electrical Code (NEC), NFPA 70 for installations in the United States, or as
specified in Section 18-152 of the Canadian Electrical Code for installation in Canada.
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.
3.
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.
4.
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.
5.
I/O connections are unrated and must be wired using wiring methods as specified in Article
501-4(b) of the National Electrical Code (NEC), NFPA 70 for installations in the United States, or
as specified in Section 18-152 of the Canadian Electrical Code for installation in Canada.
DANGER
EXPLOSION HAZARD: Do not connect or disconnect equipment unless power has been removed
or the area is known to be non-hazardous.
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