3500/44M Aeroderivitive GT Vibration
MonitorDatasheet

Bently Nevada Machinery Condition Monitoring

143441 Rev. UDescription
The 3500/44M Aeroderivitive GT Vibration Monitor is a fourchannel instrument designed for aeroderivative gas turbine
applications. It:llContinuously monitors machinery by comparing
monitored parameters against configured alarm
setpoints to drive alarms
Communicates essential machine information for both
operations and maintenance personnel

The 3500/44M 's Aero GT I/O modules interface to Velomitor
sensors and accelerometers through Bently Nevada interface
modules. The monitor uses the Prox/Velom I/O to interface toour .
Using the 3500 Rack Configuration Software, you canconfigure the 3500/44M Aeroderivitive GT Vibration Monitor
for the following filter options:lll

Signal Integration
1X vibration tracking
Band-pass vibration

The 3500/44M Aeroderivitive GT Vibration Monitor accepts
input from two separate Keyphasor signals, allowing eachchannel pair to use a different tracking filter.
You can configure multimode channels to have up to eightsets of alarm parameters including alert and danger
setpoints and alarm time delays. Each set may be configuredfor a specific machine mode.
As the machine changes modes, the monitor can switch to a
specific set using contacts on multimode I/O modules orsoftware commands through a communications gateway.

3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

Outputs

Specifications

Front Panel LEDs

InputsSignalPower
consumption

Accepts 1 to 4 signals frominterface modules (partnumbers 86517 and 86497),
velomitors andaccelerometers

Indicates when the 3500/44M
Aeroderivitive GT Vibration
Monitor is operating properly.

TX/RX LED

Indicates when the 3500/44M
Aeroderivitive GT VibrationMonitor is communicatingwith other modules in the3500 Rack.

Bypass LED

Indicates when the 3500/44M
Aeroderivitive GT Vibration
Monitor is in Bypass Mode.

7.7 Watts, typicalInput Impedance
Aero GT I/O

OK LED

Greater than 95 kΩ(Proximitor and acceleration
inputs)

BufferedTransducer
Outputs

Prox/Velom I/Oand
10 kΩ for Prox/Accel
Multimode
3.5 MΩ for Velomitor
Prox/Velom I/O

Sensitivity
Aeroderivative

3.94 mV/(mm/s) (100mV/(in/s)) or
5.71 mV/(mm/s) (145mV/(in/s))

Aeroderivative2andMultimode
Aeroderivative

3.94 mV/(mm/s) (100mV/(in/s)),
5.71 mV/(mm/s) (145mV/(in/s)),
10.19 mV/(m/s2) (100mV/g),
2.55 mV/(m/s2) (25 mV/g)
or1.02 mV/(m/s2) (10 mV/g)

The front of each monitor has
one coaxial connector foreach channel.
Each connector is short-circuit
protected.

OutputImpedance

550 ΩTransducer
Power Supply

23 Vdc nominal at 43 mA max+4 to +20 mA
Output is proportional tomonitor full-scale.

RecorderOne output is provided foreach channel.
Monitor operation isunaffected by short circuits onrecorder outputs.

VoltageCompliance(currentoutput)

Resolution

0 to +12 Vdc range across load
Load resistance is 0 to 600 Ω.
0.3662 µA per bit±0.25% error at roomtemperature±0.7% error over temperature
range
Update rate 100 ms or less

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

Signal Conditioning

Aeroderivative 2 and Multimode
Aeroderivative

Specified at +25ºC (+77ºF) unlessotherwise noted.

Accuracy

Aeroderivative

Accuracy

Exclusive of filters
Within ±0.33% of full-scale
typical±1% maximum

Frequency Response
Direct Signal - Bandpass FilterExclusive of filters
Frequency Response
Direct signal

Within ±0.33% of full-scale
typical±1% maximum

4 Hz to 30 kHz, -3 dB

Direct Signal - Bandpass Filter
Low-pass
corner200 Hz (-3 dB)

Low-passrolloff

10-pole200 dB per decade
60 dB per octave

High-passcorner25, 75 or 100 Hz (-3 dB)

High-passrolloff

10-pole200 dB per decade
60 dB per octave

Nonintegrated
velocity

4 Hz to 5500 Hz (-3 dB)

Integrated
velocity

18 Hz to 5500 Hz (-3 dB)

Nonintegrated
acceleration

4 Hz to 30,000 Hz (-3 dB)

Integrated
acceleration

18 Hz to 14,500 Hz (-3 dB)

Bias low-passfilter

0.01 Hz (-3 dB)

Bandpass Filter

Direct Signal - Tracking Filter

Low-pass
cutofffrequency

Configurable between 100 Hz
and 5500 Hz (-3 db)

Tracking filter

Valid for machine speeds of
60 to 240,000 cpm

Low-passrolloff

Constant Q

User-configurable byselecting one of 22 normal
operating speeds from 2,400
to 18,000 RPM and bybandwidth of 3 or 5Hz

8-pole160 dB per decade
48 dB per octave

High-passcutofffrequency

Configurable between 10 Hz
and 1000 Hz (-3 dB)

Rolloff

6-pole120 dB per decade
36 dB per octave

High-passrolloff

8-pole160 dB per decade
48 dB per octave

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

For Aeroderivative
channels, you can set onealert and one danger
delay for each channel.

Tracking Filter
User configurable
Constant Q

Rolloff

You can select one of 35
normal operating speeds
from 2,400 to 30,000 RPM
and bandwidth of 3 or 5 Hz.

Alarm Time
Delays6-pole120 dB per decade
36 dB per octave

Alarms
You can set Alert levels forvarious values measured
by the monitor and Dangersetpoints for up to two ofthe values measured bythe monitor using
configuration software.
Alarm setpoints

Alarm accuracy

Aeroderivative

Direct
1X Amplitude
Bandpass

Aeroderivative2

DirectBandpass
1X Amplitude
1X Phase Lag

Multimode
Aeroderivative

DirectDirect-B
Bandpass
Bandpass-B
1X Ampl
1X Ampl-B
1X Phase Lag

Alert

From 1 to 60 seconds in 1
second intervals

Danger

0.1 seconds or from 1 to 60
seconds in 1 secondintervals

Measured Values
Measured values are measurements used tomonitor the machine. The 3500/44M
Aeroderivitive GT Vibration Monitor provides thefollowing measured values.

Alarms are adjustablefrom 0 to 100% of full-scalefor each measured value
except when the full-scale
range exceeds the rangeof the transducer. In thiscase, the range of thetransducer will limit thesetpoint.
Within 0.13% of the desiredvalue

For Aeroderivative2 andMultimode Aeroderivative
channels, you can set
delays for each measured
value having alarm
setpoints.

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Aeroderivative

Direct
1X Amplitude
Bandpass

Aeroderivative2DirectBandpass
Bias
1X Amplitude
1X Phase Lag

MultimodeAeroderivativeDirectDirect-B
Bandpass
Bandpass-B
1X Ampl
1X Ampl-B
1X Phase Lag
Mode3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

PhysicalMonitor Module (Main Board)
Dimensions(Height x Width xDepth)

241.3 mm x 24.4 mm x241.8 mm
(9.50 in x 0.96 in x 9.52 in)Weight0.91 kg (2.0 lb)

I/O Modules
Dimensions(Height x Width xDepth)

241.3 mm x 24.4 mm x 99.1mm(9.50 in x 0.96 in x 3.90 in)

Weight0.45 kg (1.0 lb)

Rack Space Requirements
Monitor
Module1 full-height front slot

I/O Modules

1 full-height rear slot

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

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.

cNRTLus
When used with I/Omodule ordering
options without
internal barriers

EMC
European Community Directive:
EMC Directive 2014/30/EU

T4 @ Ta= -20˚C to +65˚C (-4˚F to+149˚F)
When installed per drawing
149243 or 149244.

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

When used with I/Omodule ordering
options withinternal barriersElectrical Safety
European Community Directive:

Standards:
EN 61010-1

RoHS
European Community Directive:
RoHS Directive 2011/65/EU

Maritime
DNV GL rules for classification – Ships,
offshore units, and high speed and lightcraft
ABS Rules for Condition of Classification,
Part 1lClass I, Zone 2: AEx/Ex nA nC ic[ia Ga] IIC T4 Gc;
Class I, Zone 2: AEx/Ex ec nC ic [iaGa] IIC T4 Gc;
Class I, Division 2, Groups A, B, C,and D (W/ IS Output for Division1)
T4 @ Ta= -20˚C to +65˚C (-4˚F to+149˚F)
When installed per drawing
138547.

LV Directive 2014/35/EUl

Class 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;

Steel Vessels Rules
Offshore Units and Structures

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

ATEX/IECEx
When used with I/Omodule ordering
options without
internal barriers

II 3 GEx nA nC ic IIC T4 Gc;
Ex ec nC ic IIC T4 Gc;
T4 @ Ta= -20˚C to +65˚C (-4˚F to+149˚F)
When installed per drawing
149243 or 149244.

When used with I/Omodule ordering
options withinternal barriers

II 3(1) G
Ex nA nC ic [ia Ga] IIC T4 Gc;
Ex ec nC ic [ia Ga] IIC T4 Gc;
T4 @ Ta= -20˚C to +65˚C (-4˚F to+149˚F)
When installed per drawing
138547.

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

External Termination Blocks

Ordering Information

125808-03

Aeroderivative ET BlockEuro Style Connectors

125808-08

Prox/Velom External
Termination BlockEuro Style connectors

125808-11

Multimode Prox/Velom
External Termination BlockEuro Style connectors

Aeroderivative Monitor
3500/44 - AA - BB

125808-13

Multimode Recorder Outputand Mode Input External
Termination BlockEuro Style connectors

A: I/O Module Type

128702-01

Recorder External
Termination BlockEuro Style connectors

128015-03

Aeroderivative External
Termination Block
Terminal Strip Connectors

128015-08

Prox/Velom External
Termination Block
Terminal Strip Connectors

128015-11

Multimode Prox/Velom
External Termination Block
Terminal Strip connectors

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 theBently Nevada Media Library.

01

Aero GT I/O Module with Internal
Terminations

02

Aero GT I/O Module with External
Terminations

05

Prox/Velom I/O Module with Internal
Terminations

06

Prox/Velom I/O Module with External
Terminations

07

Multimode Prox/Velom I/O Modulewith Internal Terminations

08

Multimode Prox/Velom I/O Modulewith External Terminations

128015-13

Terminal Strip connectors

B: Hazardous Area Approval Option00

None01cNRTLus (Class 1, Division 2)

02

ATEX/IECEx/CSA (Class 1, Zone 2)

Multimode Recorder Output
and Mode Input External
Termination Block

128710-01

8/13

Recorder External ET Block
Terminal Strip connectors

3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

CablesSpares3500 Transducer (XDCR) to External
Termination (ET) Block Cable
129525 - AAAA - BB

176449-03

3500/44M
Aeroderivitive GT
Vibration Monitor

143490-01

3500/44M
Aeroderivitive GT
Vibration MonitorUser
Guide

126599-01

Aero GT I/O Module
Internal Terminations

140471-01

Prox/Velom I/O Modulewith Internal
Terminations

140482-01

Prox/Velom I/O Modulewith External
Terminations

169459-01

Multimode Prox/Velom
I/O Module withInternal Terminations

169459-02

Multimode Prox/VelomI/O Module with
External Terminations

A: I/O Cable Length0005

5 feet (1.5 metres)

0007

7 feet (2.1 metres)0010

10 feet (3.0 metres)

0025

25 feet (7.6 metres)0050

50 feet (15.2 metres)

0100

100 feet (30.5 metres)

B: Assembly Instructions
01

Not Assembled

02

Assembled

3500 Recorder Output to External
Termination (ET) Block Cable
129529 - AAAA - BB
A: I/O Cable Length0005

5 feet (1.5 metres)

0007

7 feet (2.1 metres)0010

10 feet (3.0 metres)

0025

25 feet (7.6 metres)0050

50 feet (15.2 metres)

0100

100 feet (30.5 metres)

00580434

For use on I/O modules
with internalterminations

00580432

Not Assembled

02

Assembled

Euro Style connector
header
10 pinGreenFor use on I/O modules
with internalterminations

B: Assembly Instructions
01

Euro Style connector
header
8 pin
Green00561941

9/13

Prox/Velom andMultimode Prox/Velom
I/O Module ten-pin
connector shunt

3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

166M2389

Connector Header
Push-in-Spring Type(Alternative for PN
00580434)

166M2388

Connector Header
Push-in-Spring Type(Alternative for PN00580432)

143441 Rev. U

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. UGraphs and Figures

1. Status LEDs
2. Buffered Transducer Outputs
3. 3500/44M Aeroderivitive GT Vibration Monitor Main
Module4. Aero GT I/O Module with Internal Terminations
5. Aero GT I/O Module with External Terminations
6. Prox/Velom I/O, Internal Terminations
7. Prox/Velom I/O, External Terminations
8. Multimode Prox/Velom I/O, Internal Terminations
9. Multimode Prox/Velom I/O, External Terminations
Figure 1: Front and Rear Views of the 3500/44M Monitor

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

Figure 2: Side View of I/O Modules
Prox/Velom I/O modules and Multimode Prox/Velom I/O modules with internal and externalterminations have the same jumpers.

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3500/44M Aeroderivitive GT Vibration Monitor
Datasheet

143441 Rev. U

Copyright 2024 Baker Hughes Company. All rights reserved.

Bently Nevada, Keyphasor, M2, Proximitor, Velomitor and Orbit Logo are registered trademarks of Bently Nevada, aBaker Hughes business, in the United States and other countries. The Baker Hughes logo is a trademark of Baker
Hughes Company. All other product and company names are trademarks of their respective holders. Use of thetrademarks 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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