Emerson FB2100 Flow Computer Instruction Manual
D301783X012
March 2019
Special Instructions for Class I Division 2 Locations
99
Appendix A: Special Instructions for Class I
Division 2 Locations
1.
The Emerson FB2100 flow computer is listed by Underwriters Laboratories (UL) as non-
incendive and is suitable for use in Class I, Division 2, Groups A, B, C and D hazardous
locations or nonhazardous locations. Read this appendix carefully before installing a non-
incendive Emerson FB2100 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.
2.
The Emerson FB2100 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
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.
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 FB2100 flow computer. Connection to the RTD is
approved as a non-incendive circuit so that Division 2 wiring methods are not required.
5.
I/O connections are unrated and must be wired using Division 2 wiring methods.
DANGER
EXPLOSION HAZARD: Do not disconnect equipment unless power has been removed or the area
is known to be non-hazardous.
DANGER
EXPLOSION HAZARD: Substitution of any components may impair suitability for Class I, Division 1
or Class I, Division 2.
DANGER
EXPLOSION HAZARD: Do not replace batteries unless power has been switched off or the area is
known to be non-hazardous. Batteries must only be changed in an area known to be non-
hazardous.
