The 3500/77M Recip Cylinder Pressure Monitor is a 4-channel
monitor that accepts input from Bently Nevada approved
pressure transducers, conditions the signal to make various
pressure measurements for reciprocating compressors, and
compares the conditioned signals with user-programmable
alarms.
The primary purpose of the 3500/77M monitor is to provide:
l Machinery protection by continuously comparing
monitored parameters against configured alarm
setpoints to drive alarms.
l Essential machine information for operations and
maintenance personnel.
Depending on configuration, each channel typically
conditions its input signal to provide various parameters
called measured variables. Users can configure Alert
setpoints for each active measured variable and Danger
setpoints for any two of the active measured variables.
147485 Rev. R
Each channel of the 3500/77M will provide eight measured
variable values that relate to cylinder pressure operation. The
five values that relate to a single chamber are as follows:
l Discharge Pressure
l Suction Pressure
l Maximum Pressure
l Minimum Pressure
l Compression Ratio
3500/77M Recip Cylinder Pressure Monitor
Datasheet147485 Rev. R
Three measured variables combine one or
more channel values with configured
mechanical parameters to compute their
value:
l Peak Rod Compression
l Peak Rod Tension
l Degree of Rod Reversal
For more information on the 3500/77M Recip
Cylinder Pressure Monitor, refer to the User
Guide (document 146282).
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3500/77M Recip Cylinder Pressure Monitor
Datasheet147485 Rev. R
Specifications
Inputs
Accepts 1 to 4 channels of Bently
Signal
Scale Factor
range†95,000 mV/psi for 100 psia
range†38,000 mV/psi for 250 psia
range†19,000 mV/psi for 500 psia
range†9,500 mV/psi for 1000 psia
range†3,800 mV/psi for 2500 psia
range†1,900 mV/psi for 5000 psia
range†950 mV/psi for 10,000 psia
†All pressure transducers will be
supplied with scale factor specifications
that include pressure/voltage values at
two points. The above data assumes
+0.5 Vdc at 0 psia and +10.0 Vdc at the
full-range psia value.
Nevada approved positive voltage
3rd-party pressure transducers
(psia)
Power
Consumption
7.8 watts with transducer supplies at
full load.
Outputs
Front Panel LEDs
OK LED
TX/RX LED
Bypass LED
Buffered Transducer
Outputs
The Buffered Transducer Outputs on
monitors using the Cylinder Pressure I/O
module will be inverted and offset by -
2.265 Vdc.
Output Impedance 550 Ω
Transducer Power
Supply
Indicates when the 3500/77M
is operating properly.
Indicates when the 3500/77M
is communicating with other
modules in the 3500 rack.
Indicates when the 3500/77M
is in Bypass Mode.
The front of each monitor has
one coaxial connector for
each channel. Each connector
is short-circuit protected.
+23.0 ± 0.8 Vdc with 24.5 ma
current limiting on each
channel.
Signal Conditioning
Frequency
Response
Pressure
Accuracy
0 to 5.5 kHz on all configured
pressure channels
Within ± 0.5% of pressure transducer
full-range (9.5 volts: From +0.5 to
+10.0 volts) @ +25°C (77º F)
Within ± 1.0% of pressure transducer
full-range (9.5 volts: From +0.5 to
+10.0 volts) over –30 °C to +65 °C (22 ºF to 150 ºF)
Maximum Pressure, Minimum
Pressure, Compression Ratio, Peak
Rod Compression, Peak Rod Tension,
Degree of Rod Reversal
50 kΩ
Environmental Limits
Operating Temperature
When used with
Internal/External
Termination Cylinder
Pressure I/O Module:
Storage Temperature
Humidity95%, non-condensing
-30 °C to +65 °C
(-22 °F to +150 °F)
-40 °C to +85 °C
(-40 °F to +185 °F)
Physical
Monitor Module
Dimensions (Height x
Width x Depth)
Weight0.91 kg (2.0 lb.)
I/O Modules
Dimensions (Height x
Width x Depth)
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
3/9
3500/77M Recip Cylinder Pressure Monitor
Datasheet147485 Rev. R
(9.50 in x 0.96 in x 3.90 in)
Weight0.20 kg (0.44 lb.)
Rack Space Requirements
Monitor Module1 full-height front slot
I/O Modules1 full-height rear slot
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
3500/77M Recip Cylinder Pressure Monitor
Datasheet147485 Rev. R
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;
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.
ATEX/IECEx
II 3 G
Ex nA nC ic IIC T4 Gc
Ex ec nC ic IIC T4/T5 Gc
T4 @ Ta= -20˚C to +65˚C
(-4˚F to +149˚F)
When installed per drawing 149243
or 149244.
5/9
3500/77M Recip Cylinder Pressure Monitor
Datasheet147485 Rev. R
External Termination Blocks
Ordering Considerations
General
The 3500/77M Module requires the following (or
later) firmware and software revisions:
l 3500/77M Module Firmware Revision L
l 3500/01 Software – Version 3.00
l 3500/02 Software – Version 2.30
l 3500/03 Software – Version 1.30
External Termination Blocks cannot be used
with Internal Termination I/O Modules.
When ordering I/O Modules with External
Terminations, the External Termination Blocks
and Cables must be ordered separately.
The lower limit for machine speed is 60 RPMin
the standard product. For machine speeds
down to 30 RPM, modification 135M8200-01 is
required.
Ordering Information
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick Reference Guide (108M1756) available from
3500/77M Recip Cylinder Pressure Monitor
Datasheet147485 Rev. R
Copyright 2020 Baker Hughes Company. All rights reserved.
Bently Nevada 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 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.
Baker Hughes provides this information on an “as is” basis for general information purposes. Baker Hughes does
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
change 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 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
9/9
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