3500/44M Aeroderivitive GT Vibration
Monitor
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The 3500/44M Aeroderivitive GT Vibration Monitor is a fourchannel instrument designed for aeroderivative gas turbine
applications. It:
l Continuously monitors machinery by comparing
monitored parameters against configured alarm
setpoints to drive alarms
l 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 to
our .
Using the 3500 Rack Configuration Software, you can
configure the 3500/44M Aeroderivitive GT Vibration Monitor for
the following filter options:
l Signal Integration
l 1X vibration tracking
l Band-pass vibration
143441 Rev. R
The 3500/44M Aeroderivitive GT Vibration Monitor accepts
input from two separate Keyphasor signals, allowing each
channel pair to use a different tracking filter.
You can configure multimode channels to have up to eight
sets of alarm parameters including alert and danger
setpoints and alarm time delays. Each set may be configured
for a specific machine mode.
As the machine changes modes, the monitor can switch to a
specific set using contacts on multimode I/O modules or
software commands through a communications gateway.
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Outputs
Specifications
Inputs
Accepts 1 to 4 signals from
Signal
Power
consumption
Input Impedance
Aero GT I/O
Prox/Velom I/O
and
Multimode
Prox/Velom I/O
Sensitivity
Aeroderivative
Aeroderivative2
and
Multimode
Aeroderivative
interface modules (part numbers
86517 and 86497), velomitors
and accelerometers
7.7 watts, typical
Greater than 95 kΩ
(Proximitor and acceleration
inputs)
10 kΩ for Prox/Accel
3.5 MΩ for Velomitor
3.94 mV/(mm/s) (100mV/(in/s))
or
5.71 mV/(mm/s) (145mV/(in/s))
3.94 mV/(mm/s) (100mV/(in/s)),
5.71 mV/(mm/s) (145mV/(in/s)),
10.19 mV/(m/s2) (100 mV/g),
2.55 mV/(m/s2) (25 mV/g) or
1.02 mV/(m/s2) (10 mV/g)
Front Panel LEDs
Indicates when the 3500/44M
OK LED
TX/RX LED
Bypass LED
Aeroderivitive GT Vibration Monitor is
operating properly.
Indicates when the 3500/44M
Aeroderivitive GT Vibration Monitor is
communicating with other modules in
the 3500 Rack.
Indicates when the 3500/44M
Aeroderivitive GT Vibration Monitor is in
Bypass Mode.
Buffered
Transducer
Outputs
Output
Impedance
Transducer
Power
Supply
Recorder
The front of each monitor has one
coaxial connector for each channel.
Each connector is short-circuit
protected.
550 Ω
-23 Vdc nominal at 43 mA max
+4 to +20 mA
Output is proportional to monitor fullscale.
One output is provided for each
channel.
Voltage
Compliance
(current
output)
Resolution
Monitor operation is unaffected by
short circuits on recorder outputs.
0 to +12 Vdc range across load
Load resistance is 0 to 600 Ω.
0.3662 µA per bit
±0.25% error at room temperature
±0.7% error over temperature range
Update rate 100 ms or less
2/10
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Signal Conditioning
Specified at +25ºC (+77ºF) unless
otherwise noted.
Aeroderivative
Within ±0.33% of full-scale
Accuracy
Frequency Response
Direct signal 4 Hz to 30 kHz, -3 dB
Direct Signal - Bandpass Filter
Low-pass corner 200 Hz (-3 dB)
Low-pass rolloff
High-pass corner 25, 75 or 100 Hz (-3 dB)
High-pass rolloff
Direct Signal - Tracking Filter
Tracking filter
Constant Q
Rolloff
typical
±1% maximum
Exclusive of filters
10-pole
200 dB per decade
60 dB per octave
10-pole
200 dB per decade
60 dB per octave
Valid for machine speeds of 60
to 240,000 cpm
User-configurable by selecting
one of 22 normal operating
speeds from 2,400 to 18,000 RPM
and by bandwidth of 3 or 5Hz
6-pole
120 dB per decade
36 dB per octave
Aeroderivative 2 and Multimode
Aeroderivative
Within ±0.33% of full-scale
Accuracy
Frequency Response
Direct Signal - Bandpass Filter
Non-integrated
velocity
Integrated
velocity
Non-integrated
acceleration
Integrated
acceleration
Bias low-pass
filter
Bandpass Filter
Low-pass cutoff
frequency
Low-pass rolloff
High-pass cutoff
frequency
High-pass rolloff
typical
±1% maximum
Exclusive of filters
4 Hz to 5500 Hz (-3 dB)
18 Hz to 5500 Hz (-3 dB)
4 Hz to 30,000 Hz (-3 dB)
18 Hz to 14,500 Hz (-3 dB)
0.01 Hz (-3 dB)
Configurable between 100 Hz
and 5500 Hz (-3 db)
8-pole
160 dB per decade
48 dB per octave
Configurable between 10 Hz and
1000 Hz (-3 dB)
8-pole
160 dB per decade
48 dB per octave
Tracking filter
Tracking Filter
Constant Q
Rolloff
3/10
Tracking filter is valid for machine
speeds of 60 to 300,000 cpm
User configurable
You can select one of 35 normal
operating speeds from 2,400 to
30,000 RPM and bandwidth of 3
or 5 Hz.
6-pole
120 dB per decade
36 dB per octave
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Alarms
You can set Alert levels for
various values measured by the
monitor and Danger setpoints for
up to two of the values
measured by the monitor using
configuration software.
Alarm setpoints
Alarm accuracy Within 0.13% of the desired value
Aeroderivative
Aeroderivative2
Multimode
Aeroderivative
Alarm Time
Delays
Alert
Danger
Alarms are adjustable from 0 to
100% of full-scale for each
measured value except when the
full-scale range exceeds the
range of the transducer. In this
case, the range of the transducer
will limit the setpoint.
Direct
1X Amplitude
Bandpass
Direct
Bandpass
1X Amplitude
1X Phase Lag
Direct
Direct-B
Bandpass
Bandpass-B
1X Ampl
1X Ampl-B
1X Phase Lag
For Aeroderivative channels, you
can set one alert and one danger
delay for each channel.
For Aeroderivative2 and
Multimode Aeroderivative
channels, you can set delays for
each measured value having
alarm setpoints.
From 1 to 60 seconds in 1 second
intervals
0.1 seconds or from 1 to 60
seconds in 1 second intervals
Measured Values
Measured values are measurements used to
monitor the machine. The 3500/44M
Aeroderivitive GT Vibration Monitor provides the
following measured values.
Direct
Aeroderivative
Aeroderivative2
Multimode
Aeroderivative
1X Amplitude
Bandpass
Direct
Bandpass
Bias
1X Amplitude
1X Phase Lag
Direct
Direct-B
Bandpass
Bandpass-B
1X Ampl
1X Ampl-B
1X Phase Lag
Mode
Physical
Monitor Module (Main Board)
Dimensions
(Height x Width x
Depth)
Weight 0.91 kg (2.0 lb)
I/O Modules
Dimensions
(Height x Width x
Depth)
Weight 0.45 kg (1.0 lb)
241.3 mm x 24.4 mm x 241.8
mm
(9.50 in x 0.96 in x 9.52 in)
241.3 mm x 24.4 mm x 99.1
mm
(9.50 in x 0.96 in x 3.90 in)
Rack Space Requirements
Monitor Module 1 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. R
Compliance and Certifications
FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
l This device may not cause harmful
interference.
l This device must accept any
interference received, including
interference that may cause
undesired operation.
EMC
European Community Directive:
EMC Directive 2014/30/EU
Standards:
EN 61000-6-2 Immunity for
Industrial Environments
EN 61000-6-4 Emissions for
Industrial Environments
Hazardous Area Approvals
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.
CSA/NRTL/C
Class I, Zone 2: AEx/Ex nA nC ic
IIC T4 Gc;
When used with
I/O module
ordering options
without internal
barriers
When used with
I/O module
ordering options
with internal
barriers
Class I, Zone 2: AEx/Ex ec nC ic
IIC T4 Gc;
Class I, Division 2, Groups A, B, C,
and D;
T4 @ Ta= -20˚C to +65˚C (-4˚F
to +149˚F)
When installed per drawing
149243 or 149244.
Class I, Zone 2: AEx/Ex nA nC ic
[ia Ga] IIC T4 Gc;
Class I, Zone 2: AEx/Ex ec nC ic
[ia Ga] IIC T4 Gc;
Class I, Division 2, Groups A, B, C,
and D (W/ IS Output for Division
1)
T4 @ Ta= -20˚C to +65˚C (-4˚F
to +149˚F)
When installed per drawing
138547.
Electrical Safety
European Community Directive:
LV Directive 2014/35/EU
Standards:
EN 61010-1
RoHS
European Community Directive:
RoHS Directive 2011/65/EU
Maritime
ABS - Marine and Offshore Applications
DNV GL Rules for Classification – Ships,
Offshore Units, and High Speed and Light
Craft
ATEX/IECEx
When used with
I/O module
ordering options
without internal
barriers
When used with
I/O module
ordering options
with internal
barriers
II 3 G
Ex 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.
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.
5/10
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
External Termination Blocks
Ordering Information
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.
Aeroderivative Monitor
3500/44 - AA - BB
A: I/O Module Type
01 Aero GT I/O Module with Internal Terminations
02 Aero GT I/O Module with External Terminations
Prox/Velom I/O Module with Internal
05
Terminations
Prox/Velom I/O Module with External
06
Terminations
Multimode Prox/Velom I/O Module with
07
Internal Terminations
Multimode Prox/Velom I/O Module with
08
External Terminations
B: Hazardous Area Approval Option
00 None
01 CSA/NRTL/C (Class 1, Division 2)
ATEX/IECEx/CSA (Class 1, Zone 2)
02
125808-03
125808-08
125808-11
125808-13
128702-01
128015-03
128015-08
128015-11
128015-13
128710-01
Aeroderivative ET Block
Euro Style Connectors
Prox/Velom External Termination
Block
Euro Style connectors
Multimode Prox/Velom External
Termination Block
Euro Style connectors
Multimode Recorder Output and
Mode Input External Termination
Block
Euro Style connectors
Recorder External Termination
Block
Euro Style connectors
Aeroderivative External
Termination Block
Terminal Strip Connectors
Prox/Velom External Termination
Block
Terminal Strip Connectors
Multimode Prox/Velom External
Termination Block
Terminal Strip connectors
Multimode Recorder Output and
Mode Input External Termination
Block
Terminal Strip connectors
Recorder External ET Block
Terminal Strip connectors
6/10
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Cables
3500 Transducer (XDCR) to External
Termination (ET) Block Cable
129525 - AAAA - BB
A: I/O Cable Length
0005 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 Length
0005 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
Spares
176449-03
143490-01
126599-01
140471-01
140482-01
169459-01
169459-02
00580434
00580432
00561941
3500/44M Aeroderivitive
GT Vibration Monitor
3500/44M Aeroderivitive
GT Vibration MonitorUser
Guide
Aero GT I/O Module
Internal Terminations
Prox/Velom I/O Module
with Internal Terminations
Prox/Velom I/O Module
with External Terminations
Multimode Prox/Velom I/O
Module with Internal
Terminations
Multimode Prox/Velom I/O
Module with External
Terminations
Euro Style connector
header
8 pin
Green
For use on I/O modules
with internal terminations
Euro Style connector
header
10 pin
Green
For use on I/O modules
with internal terminations
Prox/Velom and
Multimode Prox/Velom I/O
Module ten-pin connector
shunt
7/10
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Graphs and Figures
1. Status LEDs
2. Buffered Transducer Outputs
3. 3500/44M Aeroderivitive GT Vibration Monitor Main Module
4. 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. R
Figure 2: Side View of I/O Modules
Prox/Velom I/O modules and Multimode Prox/Velom I/O modules with internal and external
terminations have the same jumpers.
9/10
3500/44M Aeroderivitive GT Vibration Monitor
Datasheet 143441 Rev. R
Copyright 2020 Baker Hughes Company. All rights reserved.
Bently Nevada, Orbit Logo, Velomitor, and Keyphasor are registered trademarks of Bently Nevada, a Baker 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 the trademarks
does not imply any affiliation with or endorsement by the respective holders.
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not make 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 the
information, whether a claim is asserted in contract, tort, or otherwise. Baker Hughes reserves the right to make
changes 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 BakerHughes and its affiliates; and is subject to
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repackaged without the express written consent of Baker Hughes. This product or associated products may be
covered by one or more patents. See Bently.com/legal.
1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 or 1.800.227.5514 (US only)
Bently.com
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