3500/04 Internal Barriers
Datasheet

Bently Nevada Machinery Condition Monitoring141495 Rev. P

Description
3500 Internal Barriers are intrinsically safe interfaces thatprovide explosion protection for transducer systems
connected directly to the 3500 Machinery Protection System.
The internal barriers are fully compatible with the 3500
System and provide a convenient and cost-effective solution
for installing all types of transducer systems within ahazardous area.
Unlike external barriers, 3500 Internal Barriers are an
integral part of the 3500 System and will notdegrade the system's performance.
We offer Bently Nevada transducer systems withcomprehensive approvals for hazardous area installations.
The transducer systems are matched to those of the 3500
Internal Barriers. See Compatible Monitors and Transducers
on page 8.
Each component complies both individually and as part of asystem with the safety requirements of North American andinternational standards. Hence, you don't have to reference
individual certificates to verify the compatibility betweencomponents.
Standard and internal barrier monitors can reside within thesame 3500 rack. You can upgrade standard monitors byreplacing existing I/O modules with those that containinternal barriers.

3500/04 Internal Barriers
Datasheet

141495 Rev. P

I/O Module Positioning

Installation Guidelines

Internal barrier I/O modules have an increased
depth over that of standard barrier I/Omodules. Consider the rack position withrespect to adjacent modules to ensure that you
can easily access the I/O modules during
maintenance.

The internal barriers for a 3500 rack areincorporated in special Monitor I/O Modules.
These barriers provide explosion protection fortransducer systems that are connected to the3500 system. An intrinsically safe (IS) earthing
module provides the IS earth connection
through the 3500 system backplane.

Internal barrier I/O and IS Earthing modules canoccupy any general-purpose rack position andcan be adjacent to standard I/O module types
without compromising the 50 mm (2 in)physical separation requirement between safeand hazardous area field wiring.

The IS Earth Module requires a dedicated I/O
module position and precludes the use of thismonitor position for other 3500 Systemmodules. This limits a standard 19-inch rack to13 monitor positions. Furthermore, a number ofinstallation options are not available wheninternal barriers are installed in a 3500 rack.

Follow these guidelines when positioning I/Omodules:l

New Rack Installations
The same rack can contain both internalbarrier and standard I/O module types withoutcompromising the separation between
hazardous and safe area field wiring.

l

The External Termination option is not available
for I/O modules with internal barriers because
hazardous area approvals do not allow the useof intrinsically safe wiring within a multi-coredcable assembly.

lGroup all internal barrier I/O modules inadjacent rack positions to simplify theinstallation.
Place the IS Earthing Module in a rack
position that provides easy access forroutine online maintenance.
Consider the IS Earthing Module's
positioning relative to adjacent internalbarrier I/O modules and cabinet
bulkheads.

If you plan to install standard I/O modules or
the IS Earthing Module between a pair ofinternal barrier I/O modules, allow a minimumof two rack positions so that you can easily
access the standard I/O or IS Earthing Module
online without disturbing the adjacent I/Omodules.

Monitors that contain Triple Modular Redundant(TMR) rack options cannot use internal barrier
I/O modules since connecting a transducer tomultiple I/O module inputs will compromise theintegrity of the IS system.
A rack that contains any internal barrier
module must have a 3500/04-01 IS Earthing
Module to provide the Barrier Module IS earth
connection.

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

Upgrading a 3500 Rack

Cabinet and Panel Installations

To upgrade a 3500 rack with standard I/O
modules to a rack containing one or moreinternal barrier I/O modules, replace thestandard I/O modules with the appropriate
internal barrier modules. You can order theIS Earthing Module separately. See Ordering
Information on page 7. for more information.

The internal barrier I/O modules add
approximately 50 mm (2 in) to the depth of therack to provide the 50 mm (2 in) physicalseparation between safe and hazardous area
field wiring. Hence, a standard rack withinternal barrier modules will not fit into a 400mm cabinet.
The bulkhead rack version is available for
installations that require this cabinet type. A
standard rack with internal barrier modules will
fit comfortably in a 600 mm cabinet and the3500/06 Weatherproof Housing.

The IS Earthing Module must be
installed in a dedicated monitor
position.
Revision 2.3 or later of 3500 Rack Configuration
software is required to enable the use ofinternal barriers with the following monitor
types:
ll
l
l
l
llll

We recommend the following installation
guidelines for the internal barriers within acabinet or panel:l

3500/25
3500/40
3500/42
3500/50
3500/60
3500/61
3500/62
3500/70
3500/72l

The following firmware revisions are required:
MonitorFirmware Version Firmware Rev

3500/25

1.06

D or later

3500/501.05

E or later

3500/60

1.06

E or later

3500/61

1.06

E or later

3500/62

1.06

C or laterlll

Installations should carefully route thesafe area wiring from the bulkhead
version along the top of the 3500 rack tomaintain the 50 mm (2 in) separation
between safe and hazardous area wiring.

When multiple racks are installed within thesame cabinet, hazardous area and safe area
wiring can share the same cable trays as longas a separator is physically insulating the wires
from one another.

No firmware revisions are required for thefollowing monitors:lThe positioning of the hazardous andsafe area connectors dictates
installations route the hazardous area
field wiring above the 3500 rack and safearea wiring below the 3500 Rack.

3500/40M
3500/42M
3500/70M
3500/72M

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

Velomitor Sensor

Specifications
Physical Information
Internal Barrier I/O Module
Dimensions (Height x
Width x Depth)

241.3 mm x 24.4 mm
x 163.1 mm(9.50 in. x 0.96 in. x
6.42 in.)

Weight0.46 kg (1.01 lb)

Internal Barrier Earthing Module
Dimensions (Height x
Width x Depth)

241 mm x 24.4 mm x103.1 mm(9.50 in. x 0.96 in. x
4.06 in.)

Weight0.201 kg (0.443 lb.)

Amplitude Accuracy±1%

Circuit Parameters

Uo = 26.25 V
Rmin = 297 Ω
Io = 88.39 mA

Channel Parameters

Um = 250 V
Uo = 26.25 V
Io = 88.39 mA
Co = 0.097 uF
Lo = 4.55 mH
Po = 580.02 mW

Temperature
Temperature
Accuracy±1 °C @ +25 °C, ±15 °C
over operating
temperaturePhase Accuracy-11° @ 10 kHz

ChannelParameters

Um = 250 V
Uo = 7.71 V
Io = 89.17 mA
Co = 9.3 uF
Lo = 4.55 mH
Po = 132.41 mW

Proximity and Acceleration
The following information also applies toaeroderivative and dynamic pressure.
BandwidthAmplitude Accuracy

30 kHzCircuit Parameters

3% @ 10 kHz,
-15/+10% @ 30 kHz

Phase Accuracy-11° @ 10 kHz

Channel Parameters

Um = 250 V
Uo = 27.45 V
Io = 113.24 mA
Co = 0.086 uF
Lo = 2.77 mH
Po = 726.96 mW

Channel B

Uo = 5.36 V
Rmin = 133.25 Ω
Io = 40.23 mA

Channel C

Uo = 6.51 V
Rmin = 133.25 Ω
Io = 48.86 mA

Process Variable

Circuit Parameters
Power (PWR)

Uo = 26.25 V
Rmin = 237.6 Ω
Io = 110.48 mA

Signal (SIG)

Uo = 13.65 V
Rmin = 4985 Ω
Io = 2.74 mA

Channel Parameters

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Um = 250 V
Uo = 27.98 V
Io = 279.34 mA
Co = 0.083 uF
Lo = 0.455 mH
Po = 842.89 mW

3500/04 Internal Barriers
Datasheet

141495 Rev. P

Circuit Parameters
Power (PWR)

Uo = 26.78 V
Rmin = 297 Ω
Io = 90.17 mA

Signal (SIG)

Uo = 9.56 V
Rmin = 50.58 Ω
Io = 189.01 mA

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

Hazardous Area Approvals

Compliance and Certifications

For the detailed listing of country andproduct-specific approvals, refer tothe Approvals Quick Reference Guide(108M1756).

FCC
This device complies with part 15 of theFCC Rules. Operation is subject to thefollowing two conditions:ll

For additional technicaldocumentation, please log in to
bntechsupport.com and access theBently Nevada Media Library.

This device may not cause harmfulinterference.
This device must accept any
interference received, includinginterference that may cause
undesired operation.

cNRTLusClass I, Zone 2: AEx/Ex nA nC ic IIC T4 Gc;
Class I, Zone 2: AEx/Ex ec nC ic IIC T4 Gc;
Class I, Division 2, Groups A, B, C, and D;

EMC
European Community Directive:

T4 @ Ta= -20˚C to +65˚C (-4˚F to +149˚F)
When installed per drawing 149243 or149244.

EMC Directive 2014/30/EU
Standards:

ATEX/IECEx

EN 61000-6-2; Immunity for
Industrial Environments
EN 61000-6-4; Emissions for
Industrial Environments

II 3 GEx nA nC ic IIC T4 Gc
Ex ec nC ic IIC T4 Gc

Electrical Safety

T4 @ Ta= -20˚C to +65˚C(-4˚F to +149˚F)
When installed per drawing 149243 or149244.

European Community Directive:
LV Directive 2014/35/EUStandards:
EN 61010-1
DNV GL rules for classification – Ships,
offshore units, and high speed and lightcraft
ABS Rules for Condition of Classification,
Part 1ll

Steel Vessels Rules
Offshore Units and Structures

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

135489-02

3500/42, /70 I/O Module with
Internal Barriers (2 prox/accel+ 2 Velomitor channels) andInternal Terminations

135489-03

3500/42, /70 I/O Module with
Internal Barriers (4 Velomitorchannels) and InternalTerminations

135489-04

3500/40 I/O Module with
Internal Barriers and Internal
Terminations

136703-01

3500/50 I/O Module with
Internal Barriers and Internal
Terminations

Earthing I/O Module

136711-01

3500/60 I/O Module with
Internal Barriers and Internal
Terminations

00

None

136711-02

01

North Americal Hazloc

3500/61 I/O Module with
Internal Barriers and Internal
Terminations

02

Multi (CSA, ATEX, IECEx)

137110-01

3500/62 I/O Module with
Internal Barriers and Internal
Terminations

Ordering Information
For the detailed listing of country andproduct-specific approvals, refer tothe Approvals Quick Reference Guide(108M1756).
For additional technicaldocumentation, please log in tobntechsupport.com and access the
Bently Nevada Media Library.

3500/04-AA-BB
A: I/O Module type: Earthing module01
B: Agency Approval

When ordering internal barriers, specify theappropriate I/O module type for each monitor
module.
Install an IS Earthing Module in eachrack containing internal barriers.
Refer to each monitor module's datasheet for
specifications and ordering information.

Spares136719-01

Earthing I/O Module

138257-01

Earthing Module Front Panel

135473-01

3500/25 I/O Module withInternal Barriers and Internal
Terminations135489-01

3500/42, /70, /72 I/O Modulewith Internal Barriers (4prox/accel channels) andInternal Terminations

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

Compatible Monitors andTransducers
3500/25 Keyphasor Monitor

Temperature

3500/40M Proximitor Monitor
3500/42M Proximitor/SeismicMonitor
3500/44M Aeroderivative(only with mods)

3-wire RTDs:
10 Ω 3-wire Copper
100 Ω 3-wire Platinum
120 Ω 3-wire Nickel
Process
Variable

3500/50 Tachometer Monitor
Compatible
Monitors

llll

3500/70M Recip
Impulse/Velocity Monitor
3500/72M Recip Rod Position
MonitorlllCompatible Transducer Systems

Proximity

Acceleration

23733-03 Standard
Acceleration Transducer
330400 Standard Integral
Acceleration Transducer
330425 Standard Integral
Acceleration Transducer
49578-01 Standard
Acceleration Transducer
Modified 86517 Interface
ModuleVelocity

Velomitor Sensor
High Temperature VelomitorSensor+4 to +20 mA

The Internal Barrier system does not support
the following transducer systems:

3500/60 Temperature
Monitor
3500/61 Temperature Monitor
with Recorders
3500/62 Process Variable
Monitor
3500/64 Dynamic Pressure
Monitor (only with mods)

3300 XL Proximitor Sensor
3300 5 mm Proximitor Sensor
3300 XL 8 mm Proximitor
Sensor3300 RAM Proximitor Sensor
7200 5 & 8 mm Proximitor
Sensor3-wire Thermocouples:Type J
Type K
Type E
Type T

11 mm, 14 mm, 16 mm, 25 mm, 35 mm, or50 mm Proximitor Sensors
Velocity Seismoprobe Sensors (/42)
Velocity-to-Displacement Converter(/40)
Magnetic pick-up (/50)
4-wire RTDs and Thermocouples (/60,/61)
1-5 Vdc Process Variables (/62)
0-10 Vdc Process Variables (/62)
Internal barriers are compatible withapproved Bently Nevada transducer
systems. For all other transducer
systems, please consult your local
Bently Nevada sales professional.

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

Graphs and Figures

Figure 1: Typical Internal Barrier I/O Module

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

Figure 2: Rear Views of the 3500/04-01 Internal Barrier Earthing Module
Dimensions are in millimetres (inches)

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

1.
2.
3.
4.
5.
6.
7.
8.
9.

3500/25 Keyphasor Module
3500/40M Proximity
3500/42M, /70M, /72M Prox/Velom
3500/44M, /64 Vel/Pressure (mods only)
3500/50 Tachometer
3500/60 Temperature
3500/61 Temperature
3500/62 Process Variable
Earthing Module

Figure 3: Typical Internal Barrier Installation

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3500/04 Internal Barriers
Datasheet

141495 Rev. P

Copyright 2024 Baker Hughes Company. All rights reserved.

Bently Nevada, Keyphasor, Proximitor, Seismoprobe, Velomitor and Orbit Logo are registered trademarks of Bently
Nevada, a Baker Hughes business, in the United States and other countries. The Baker Hughes logo is a trademark ofBaker Hughes Company. All other product and company names are trademarks of their respective holders. Use ofthe trademarks does not imply any affiliation with or endorsement by the respective holders.
Baker Hughes provides this information on an “as is” basis for general information purposes. Baker Hughes does notmake any representation as to the accuracy or completeness of the information and makes no warranties of any
kind, specific, implied or oral, to the fullest extent permissible by law, including those of merchantability and fitness
for a particular purpose or use. Baker Hughes hereby disclaims any and all liability for any direct, indirect,consequential or special damages, claims for lost profits, or third party claims arising from the use of theinformation, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to makechanges in specifications and features shown herein, or discontinue the product described at any time without
notice or obligation. Contact your Baker Hughes representative for the most current information.
The information contained in this document is the property of Baker Hughes and its affiliates; and is subject tochange without prior notice. It is being supplied as a service to our customers and may not be altered or its content
repackaged without the express written consent of Baker Hughes. This product or associated products may becovered by one or more patents. See Bently.com/legal.

1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 (US) or Bently.com/support
Bently.com

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