• For Foundation™ fieldbus networks in hazardous areas

• Redundant configuration for super high system availability

• Complete enclosure systems for up to 6 intrinsically safe spur connections

• Failure alarm direct to host control system via integrated fieldbus device

• Mount in Zone 1 (gas) or 21 (dust) with spurs connected into Zone 0

• Compatible with FISCO and Entity certified fieldbus instruments

• Ergonomic mechanical design

•  Pluggable system components, without ‘gas free’ constraints

• Optional, integrated surge protection for trunk and spurs

The 9372-FB Redundant Fieldbus Barriers are field-mounted wiring hubs that create

up to six intrinsically safe spur connections from a high-energy trunk, for connection to

suitably certified Foundation™ fieldbus H1 instruments. They may be installed in Zone 1

(gas) or Zone 21 (dust) hazardous areas, with the trunk wiring implemented using suitably

protected cable and increased safety (Ex e) connection facilities.

Uniquely, the key modular components of the system (Fieldbus

Barrier, Terminator and Surge Protectors) may be ‘hot-plugged’ by

design and without gas-clearance procedures or separate isolating

switches. This virtually eliminates the risk associated with hazardous

area maintenance activities, speeds module replacement and avoids

the need for specialist operator training. Further optional features

include pluggable surge protection components for the fieldbus trunk

and individual spurs.

The 9387-FB-R Fieldbus barrier assembly is bus powered and

requires no additional power supply in the field. When used with a

fieldbus host control system, power for the trunk may be provided by

redundant MTL power supplies.

The assembly uses duplicated fieldbus barrier modules in

a redundant configuration to achieve significantly higher system

availability than equivalent ‘simplex’ units. The 9387-FB-R may

therefore be selected for critical process applications where failure

of the Fieldbus Barrier would otherwise result in unacceptable

downtime or lost production. It is also ideal for use in Fieldbus Safety

Instrumented Function (SIF) networks in which nuisance trips cannot

be tolerated. Failure annunciation to the host control system is

provided by means of an integrated Foundation™ fieldbus device with

Digital Input Function Block capability.

In common with conventional fieldbus barriers, each intrinsically

safe spur is capable of supporting a FISCO or ‘Entity’ certified fieldbus

device located in a Zone 0 or 1 hazardous area. The short-circuit

protected spurs are galvanically isolated from the trunk and require no

protective ground connection in the field.

The 9387-FB-R redundant fieldbus barrier assembly is based on

the 9370-FB range of products, which are supplied as complete,

factory-assembled systems that do not require additional wiring or

complex ancillary components. The electrical and mechanical aspects

of this design have been integrated to provide the industry’s first

complete, ergonomic solution for ‘High Energy Trunk’ applications in

hazardous areas.

• For Foundation™ fieldbus networks in hazardous areas

• Pre-assembled system components for up to 5 intrinsically

safe spur connections

• For assembly into user-specified field enclosure

• Spurs compatible with FISCO and “Entity-certified”

fieldbus instruments

• Ergonomic mechanical design

• Pluggable system components without “gas free” constraints

• Optional, integrated surge protection for trunk and spurs

The 9387-FB-R (5-spur) Open-frame redundant fieldbus barrier

provides intrinsically safe spur connections from a high-energy trunk, for

connection to suitably certified Foundation™ fieldbus H1 instruments.

The unit comprises pre-wired and assembled system components on

a stainless steel baseplate, for installation into a suitably certified field

enclosure. Connection facilities are provided for the trunk and spur

wiring, as well as all electronic modules needed to support a fully

working Fieldbus Barrier. In a typical application, an Ex e (increased

safety) certified field enclosure will be selected to allow installation

in a Zone 1 hazardous area; third-party approval of the enclosure and

contents is normally required.

• For Foundation™ fieldbus networks in

hazardous areas

• Pre-assembled system components

for 6 or 12 intrinsically safe spur

connections

• For assembly into user-specified field

enclosures

• Spurs compatible with FISCO and

“Entity-certified” fieldbus instruments

• Ergonomic mechanical design

• Pluggable system components

without “gas free” constraints

• Optional, integrated surge protection

for trunk and spurs

The 9387-FB (6-spur) and 9388-FB (12

spur) Fieldbus Barrier assemblies provide

intrinsically safe spur connections from a

high-energy trunk, for connection to

suitably certified Foundation™ fieldbus H1

instruments. Each unit comprises pre-wired

and assembled system components on a

stainless steel baseplate, for installation into

a suitably certified field enclosure. Connection

facilities are provided for the trunk and spur

wiring, as well as all electronic modules

needed to support a fully-working Fieldbus

Barrier. In a typical application, an Ex e

(increased safety) certified field enclosure will

be selected to allow installation in a Zone 1

hazardous area; third-party approval of the

enclosure and contents is normally required.

Alternative uses include applications that are

not satisfied by the 9370-FB Series Fieldbus

Barriers in standard enclosures, such as the

installation of multiple fieldbus segments

inside a single field enclosure.

Each intrinsically safe spur is capable

of supporting a FISCO or ‘Entity’ certified

fieldbus device located in a Zone 0 or 1

hazardous area. The short-circuit protected

spurs are galvanically isolated from the trunk

and require no protective ground connection

in the field. The units are bus powered and

require no additional power supply in the

field. When used with a fieldbus host control

system, power for the trunk may be provided

by MTL power supplies in redundant or non

redundant format.

The 9387-FB and 9388-FB share the unique

features of MTL’s class-leading 9370-FB

Series Fieldbus Barrier system. The key

modular components of the system (Fieldbus

Barrier, Terminator and Surge Protectors) may

be ‘hot-plugged’ by design and without gas

clearance procedures or separate isolating

switches. This virtually eliminates the risk

associated with hazardous area maintenance

activities, speeds module replacement

and avoids the need for specialist operator

training. Optional features include pluggable

surge protection components for the fieldbus

trunk and individual spurs.

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 terminator 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.

The stainless steel enclosure may be installed in a

Zone 1. Zone 2. Zone 21 or Zone 22 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 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.

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 eb tb certified blanking plugs and a breather.

• For Foundation™ fieldbus networks in hazardous areas

• Complete enclosure systems for 12 intrinsically safe spur connections

• Mount in Zone 1 (gas) or 21 (dust) with spurs connected into Zone 0

• Compatible with FISCO and Entity-certified fieldbus instruments

• Compact, modular construction

• Ergonomic mechanical design

• Pluggable system components, without ‘gas free’ constraints

• Optional, integrated surge protection for trunk and spurs

• Optional, integrated Isolation Switch for Trunk

The 9373-FB3 is a third-generation product, in a successful

range of Eaton Fieldbus Barrier Systems.  The field-mounted

enclosure contains a barrier that receives power and

FOUNDATIONTM 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.

MTL4546S ISOLATING DRIVER

for 4–20mA HART® valve positioners with line fault detection and long field lines

The MTL4546S accepts a 4/20mA floating signal from a safe-area

controller to drive a current/pressure converter (or any other load up to

710Ω) in a hazardous area. For HART valve positioners, the module also

permits bi-directional transmission of digital communication signals.

Process controllers with a readback facility can detect open circuits in

the field wiring: if these occur, the current taken into the terminals drops

to a preset level. The reduced maximum open-circuit voltage permits

the use of longer field lines compared to MTL4546

SPECIFICATION

See also common specification

Number of channels

One

Location of I/P converter

Zone 0. IIC, T4–6 hazardous area if suitably certified

Div. 1. Group A, hazardous location

Working range

4 to 20mA

Digital signal bandwidth

500Hz to 10kHz

Maximum load resistance

710Ω (14.2V at 20mA)

Minimum load resistance

90Ω

Output resistance

> 1MΩ

Under/over range capability

Under range = 1mA

Over range = 24mA (load ≤ 520Ω)

Input and output circuit ripple

< 40µA peak-to-peak

MTL4546/C/Y – MTL5546/Y ISOLATING DRIVER

for 4–20mA HART® valve positioners with line fault detection

The MTLx546 accepts a 4/20mA floating signal from a safe-area controller

to drive a current/pressure converter (or any other load up to 800Ω) in a

hazardous area. For HART valve positioners, the module also permits

bi-directional transmission of digital communication signals. Process

controllers with a readback facility can detect open or short circuits in

the field wiring: if these occur, the current taken into the terminals drops

to a preset level. The MTL4546C and the MTLx546Y are very similar

to the MTLx546 except that they provide open circuit detection only

(i.e. no short-circuit detection).