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INM MTL9373-FB3 Rev 1
INM MTL9373-FB3 Rev 1
Figure 1.1
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Fieldbus Barrier in Standard Small enclosure
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OVERVIEW
This manual explains the installation and maintenance procedures for the 9373-FB3-
Px-SS MTL Fieldbus Barrier enclosure and must be read in association with the
product datasheets that contain electrical data.
The 9373-FB3-Px-SS Fieldbus Barrier enclosure is a field-mounted wiring hub
providing twelve, intrinsically safe, ‘simplex’, spur connections from a single
non-intrinsically safe trunk, for connection to Foundation™ fieldbus H1 fieldbus
instruments. Key features of the barrier include short circuit protection on all of the
spurs and the ability to ‘live-work’ any spur without disrupting the operation of the
others or the need to power down the enclosure.
The incoming fieldbus trunk and the output spurs may, optionally, be fitted with
surge-protection devices.
The enclosure material is electrochemically polished, 316L stainless steel and may
be installed in a Zone 1, Zone 2, Zone 21 or Zone 22 hazardous and safe area.
The enclosure will be marked with the following model number.
9373-FB3-Px-SS - Compact Fieldbus Barrier system, 12-spur, stainless steel
enclosure.
Where Px is either PS (for pluggable screw terminal connectors) or PC (for pluggable
spring clamp connectors); however, a number of variants are available and so the
user is referred to the product data sheet for ordering information and further details.
MTL9373-FB3-Px-SS-12 spur
Compact Fieldbus Barrier System
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DESCRIPTION
The 9373-FB3-Px-SS is a third-generation product, in a successful range of Eaton
- MTL Fieldbus Barrier Systems. The field-mounted enclosure contains a barrier
that receives power and FOUNDATION
TM
Fieldbus H1 communications via a
non-intrinsically safe trunk and converts this to a number of galvanically isolated,
intrinsically safe, spur connections.
The trunk terminals are implemented as increased safety (Ex e) and the spur
terminals as intrinsically safe (Ex ia) for connection to IS fieldbus instruments in IIC,
Zone 0 hazardous areas. The spur connections are compatible with both FISCO and
Entity-certified field instruments.
The fieldbus barrier is mounted in a 316L stainless steel, increased safety, Ex e
enclosure that segregates spur and trunk cabling in accordance with hazardous
area certification. Inside the enclosure, the incoming trunk wiring terminates in a
separate compartment containing increased safety (Ex e) trunk wiring terminals.
This compartment has a protective cover to deter interference, and carries a warning
to the user not to work on trunk wiring without first isolating the power. A fieldbus
termination is included for the trunk wiring to ensure correct termination of the
wiring and prevent unwanted reflections and signal disturbances.
The system described in this manual provides 12 spurs of “simplex” type - meaning
they are not intended to provide redundancy between spurs. Each spur is short
circuit protected, so that other devices continue to operate in the presence of field
wiring faults.
Surge protection can be added on individual outgoing spurs by the use of individual
Spur Surge protection modules (part no. FS32). Similarly, trunk surge suppression is
available to protect the fieldbus barrier against damaging voltage and current surges
on the incoming trunk wiring.
The stainless steel enclosure may be installed in a Zone 1 or Zone 2 hazardous area;
in which case, the trunk wiring must be implemented using suitably protected cable.
It provides excellent chemical and moisture resistance and is suitable for use in a
wide range of corrosive environments.
The 9373-FB3-Px-SS fieldbus barrier enclosure is bus-powered and requires no
additional power supply in the field. When used with a fieldbus host control system,
power for the trunk MUST be provided only by a supply conforming to IEC 61158-
2, e.g. MTL F800 or MTL 918x range of redundant power supplies and certified for
connection into Zone 1 or Zone 2 as required.
The enclosure is supplied pre–drilled for all trunk and spur cable entries and internal
trunking provides adequate separation between the trunk and spur cables. It is also
fitted with Ex e certified blanking plugs and a breather.
