3500/64M Dynamic Pressure Monitor
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The 3500/64M Dynamic Pressure Monitor is a single slot, fourchannel monitor that accepts input from high temperature
pressure transducers and uses this input to drive alarms. The
monitor’s one measured variable per channel is bandpass
dynamic pressure.
You can use the 3500 Rack Configuration Software to
configure the bandpass corner frequencies along with an
additional notch filter. The monitor provides a recorder
output for control system applications.
The primary purpose of the 3500/64M Dynamic Pressure
Monitor is to provide the following:
l Machinery protection by continuously comparing
monitored parameters against configured alarm
setpoints to drive alarms
l Essential machine information for operations and
maintenance personnel
Each channel, depending on configuration, conditions its input
signal to generate various parameters called measured
variables. You can configure alert and danger setpoints for
each active measured variable.
Document: 141536
Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
Update rate approximately 100 ms or less
Specifications
Inputs
Signal
Input Impedance
3 wire transducer 10 kΩ
2 wire 1.5 MΩ to 3.5 MΩ typical
Sensitivity
Dynamic pressure 100 mV/psi (1.45 mV/mBar)
Outputs
Front Panel LEDs
OK LED
TX/RX LED
Bypass LED
Buffered Transducer
Outputs
Output
Impedance
Transducer Supplies
3 wire -24 Vdc
2 wire 3.3 mA current source @ 22 Vdc (nominal)
Recorder
outputs
Voltage
Compliance
(current
output)
Resolution
Indicates when the 3500/64M Dynamic
Pressure Monitor is operating properly.
Indicates when the 3500/64M is
communicating with other modules in the
3500 rack.
Indicates when the 3500/64M is in Bypass
Mode.
The front of each monitor has one coaxial
connector for each channel.
Each connector is short-circuit protected.
The Cascade Mode does not cascade the
buffered transducer outputs.
550 Ω
+4 to +20 mA
Values are proportional to monitor full-scale.
The monitor provides individual recorder
values for each channel.
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
-0.66 to +0.70% error over temperature range
Accepts from 1 to 4 pressure
transducer signals
Signal Conditioning
Dynamic Pressure - Direct Filter
5 Hz to 4 KHz
Low mode
High mode
If no LP filter is chosen, the range
extends to approximately 5.285 KHz
10 Hz to 14.75 KHz
Fixed low pass
Low and high filtering modes are options for a
channel pair. Channels 1 and 2 form a pair, and
channels 3 and 4 are the other pair. You may
select different band pass options on each
channel of a channel pair. However, the channels
within the pair must operate in the same
filtering mode.
You can set up the signal processing so that the
monitor feeds only the channel 1 input to all
four channels. This feature is called Cascade
Mode and is denoted as 1 >ALL in the 3500
Rack Configuration Software.
In Cascade Mode, you can select filter mode
options for a channel pair only. One transducer
provides input to four channels for different
filtering requirements. As a result, you can
configure four separate bandpass filter options
and four separate full-scale ranges with one
transducer input.
The two modes of filtering provide different
qualities of filtering.
Low Mode
Filter Quality
High pass
Low pass (LP)
Fixed low pass
LP = none
10-pole (200dB per decade, 60 dB per
octave)
10-pole (200dB per decade, 60 dB per
octave)
-78 dB minimum attenuation in the
stop band.
2/9 141536 Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
High Mode
Filter Quality
6-pole (120 dB per decade, 36 dB per
High pass
Low pass
Line rejection
(notch) filter
Filter quality
response
octave)
-65 dB minimum attenuation in the
stop band
The line rejection filter has two
settings, 50 or 60 Hz. Filter response
and center frequency selections are
valid for both settings.
-0.175 dB (98%) of Full Scale at
Center Frequency of +2 Hz and
above
-0.175 dB (98%) of Full Scale at
Center Frequency of –2 Hz and below
-35 dB (1.8%) of Full Scale from –0.5
Hz of Center Frequency to +0.5 Hz of
Center Frequency
Measured Variables
Dynamic pressure
direct
The primary value for each channel
Physical
Alarms
Use the 3500 Rack Configuration
Software to set alert and danger
levels for the direct values measured
by the monitor.
Alarm Setpoints
Accuracy of alarm
setpoints
Alarm Time Delays
You can program alarm delays using the 3500
Rack Configuration Software from one to 60
seconds in one second intervals.
Alert
Danger
Alarms are adjustable from 0 to 100%
of full-scale for each measured value.
However, when the full-scale range
exceeds the range of the transducer,
the range of the transducer will limit
the setpoint.
Within 0.13% of the desired value
From one to 60 seconds in one
second intervals
0.1 seconds or from one to 60
seconds in 0.1 second intervals
Monitor Module (Main Board)
Dimensions
(Height x Width x
Depth)
Weight 0.82 kg (1.8 lb)
I/O Modules (non-barrier)
Dimensions
(Height x Width x
Depth)
Weight 0.20 kg (0.44 lb)
I/O Modules (with barrier)
Dimensions
(Height x Width x
Depth)
Weight 0.46 kg (1.01 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)
241.3 mm x 24.4 mm x 163.1 mm
(9.50 in x 0.96 in x 6.42 in)
3/9 141536 Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
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
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
4/9 141536 Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
Hazardous Area Approvals
For the detailed listing of country and product specific
approvals, refer to the Approvals Quick Reference
Guide (108M1756) available from www.Bently.com.
CSA/NRTL/C
Class I, Zone 2: AEx/Ex nA nC ic IIC
T4 Gc;
Class I, Zone 2: AEx/Ex ec nC ic IIC
When used with I/O
module ordering
options without
internal barriers
When used with I/O
module ordering
options with internal
barriers
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.
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.
5/9 141536 Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
02 Assembled
Ordering Information
For the detailed listing of country and product specific
approvals, refer to the Approvals Quick Reference
Guide (108M1756) available from www.Bently.com.
Dynamic Pressure Module
3500/64 - AA - BB
AA: I/O Module Type
01 I/O Module with Internal Termination
02 I/O Module with External Termination
BB: Agency Approval
00 None
01 CSA / NRTL / C (Class I, Division 2)
02 ATEX / IECEx / CSA (Class I, Zone 2)
External Termination (ET) Blocks
128015-09
125808-09
128710-01
128702-01
Cables
3500 Dynamic Pressure Signal to
External Termination Block Cable
129525 - AAAA-BB
AA: 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)
BB: Assembly Instructions
01 Not assembled
Dynamic Pressure ET Block
Terminal Strip connectors
Dynamic Pressure ET Block
Euro Style connectors
Recorder Out ET Block
Terminal Strip connectors
Recorder Out ET Block
Euro Style connectors
3500 Recorder Output to External
Termination Block Cable
129529-AAAA-BB
AA: 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)
BB: Assembly Instructions
01 Not assembled
02 Assembled
Spares
176449-05
140471-02
140482-02
143729-01
04425545 Grounding wrist strap
04400037 IC Removal Tool
00580434
00580436
00502133
3500/64M Dynamic Pressure
Monitor
I/O Module
Internal Termination
I/O Module
External Termination
Cylinder Pressure I/O
Internal Termination
Connector Header
Internal Termination
8 position, Green
Connector Header
Internal Termination
6 position
Green
Connector Header
Internal Termination
12 position
Blue
6/9 141536 Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
Graphs and Figures
1. Status LEDs
2. Buffered Transducer Outputs
3. I/O Module with Internal Terminations
4. I/O Module with External Terminations
Figure 1: Front and Rear Views of 3500/64M Dynamic Pressure Monitor
7/9 141536 Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
Figure 2: Side View of I/O Modules for 3500/64M
The I/O modules with internal or external terminations have the same jumpers.
8/9 141536 Rev. L
3500/64M Dynamic Pressure Monitor
Datasheet
Copyright 2019 Baker Hughes, a GE company, LLC ("BHGE") All rights reserved.
Bently Nevada and Orbit Logo are registered trademarks of BHGE in the United States and other
countries. All 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. This product
may be covered by one or more patents, see Bently.com/legal for current status.
The information contained in this document is subject to change without prior notice.
1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 Bently.com
9/9 141536 Rev. L
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