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- 3500/72M-03-00 176449-08+135489-01
- 4-channel Reciprocating Rod Position Monitor System
- USA
- 241.3 × 24.4 × 241.8 mm
- 0.91kg
- Xiamen, China
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Bently Nevada 3500/72M-03-00 176449-08 + 135489-01 Reciprocating Rod Position Monitoring System
1. Product Overview
The Bently Nevada 3500/72M-03-00 with part numbers 176449-08 and 135489-01 is associated with the 3500 Series machinery protection platform. The primary monitoring module, 3500/72M, part number 176449-08, is a reciprocating rod position monitor designed for machinery such as reciprocating compressors. The 135489-01 part number identifies an I/O module with internal barriers and internal terminations, used as part of the corresponding system configuration.
These components serve different roles: the 3500/72M processes the monitored signals and evaluates configured measurements, while the I/O module provides the appropriate signal interface and connection arrangement. They should not be treated as two interchangeable monitor modules.
| Item | Product information |
|---|---|
| Brand | Bently Nevada |
| Product series | 3500 Series Machinery Protection and Monitoring System |
| Main monitoring model | 3500/72M-03-00 |
| Monitor part number | 176449-08 |
| Associated I/O module | 135489-01 |
| Main product type | Reciprocating Rod Position Monitor |
| I/O module type | I/O module with internal barriers and internal terminations |
| Primary function | Reciprocating machinery rod-position monitoring and signal processing |
| System installation | 3500 rack-based monitoring platform |
| Typical monitored equipment | Reciprocating compressors and compatible machinery |
| Main operating purpose | Continuous condition monitoring, abnormal-condition detection, and machinery protection support |
Configuration note: The exact meaning of the suffix -03-00 and the compatibility of both part numbers should be checked against the equipment nameplates, system configuration, and the required I/O option before ordering. The 3500/72M monitor and the 135489-01 I/O module have separate specifications.
2. Technical Specifications
2.1 Main monitor: 3500/72M, part number 176449-08
The 3500/72M is designed to receive compatible proximity-transducer signals and process them into measurements used to assess reciprocating rod movement. Its channel configuration supports paired-channel programming, allowing the monitoring functions to be assigned according to the application and system setup.
| Parameter | Specification |
|---|---|
| Model | 3500/72M-03-00 |
| Monitor part number | 176449-08 |
| Brand | Bently Nevada |
| Series | 3500 Series |
| Product type | Reciprocating Rod Position Monitor |
| Input type | Compatible proximity transducer signals |
| Input channels | Up to 4 channels, depending on the approved configuration |
| Input impedance | Approximately 10 kΩ |
| Transducer power supply | -24 VDC for compatible transducers |
| Nominal power consumption | Approximately 7.7 W |
| Buffered output impedance | Approximately 510 Ω |
| Channel programming | Channels can be configured in pairs |
| Measurement processing | Dynamic and static rod-position measurements, depending on configuration |
| Alarm functions | User-configurable Alert and Danger setpoints |
| Alarm response | Can communicate alarm conditions through the configured 3500 system |
| Status indicators | OK, TX/RX, and Bypass indicators |
| Rack requirement | One full-height front slot |
| System communication | Through the 3500 rack backplane |
| Power source | 3500 rack power system |
| Operating temperature | Depends on I/O type and approved system configuration |
| Storage temperature | Commonly specified as approximately -40°C to +85°C |
| Dimensions, monitor module | Approximately 241.3 × 24.4 × 241.8 mm (H × W × D) |
| Weight, monitor module | Approximately 0.91 kg |
| Installation method | Rack-mounted |
| Main application | Reciprocating compressor rod-position monitoring |
The dimensions and weight above refer to the main monitor module, not the 135489-01 I/O module or the complete rack assembly. Environmental limits and some performance characteristics depend on the installed I/O configuration and the applicable hardware revision.
2.2 Associated I/O module: part number 135489-01
The 135489-01 is an I/O module option with internal barriers and internal terminations. It provides the connection arrangement required by a compatible 3500 monitoring configuration. Because barrier-equipped I/O hardware can differ physically from standard I/O hardware, it is important to confirm the exact module variant when replacing an installed unit.
| Parameter | Specification |
|---|---|
| Part number | 135489-01 |
| Brand | Bently Nevada |
| Product series | 3500 Series |
| Product type | I/O module with internal barriers and internal terminations |
| Associated monitoring family | Compatible 3500/42, 3500/70, and 3500/72 family configurations, subject to approved configuration |
| Main function | Signal interfacing and termination |
| Barrier arrangement | Internal barriers |
| Termination arrangement | Internal terminations |
| Installation location | Rear I/O position of a compatible 3500 rack |
| Dimensions | Approximately 241.3 × 24.4 × 163.1 mm (H × W × D) |
| Weight | Approximately 0.46 kg |
| Replacement considerations | Verify the exact I/O option, barrier requirements, connector arrangement, and monitor compatibility |
| Complete system compatibility | Must be confirmed against the installed monitor, transducers, and rack configuration |
The I/O module’s dimensions and weight are different from those of the main monitor. When planning a replacement or shipment, use the specifications for the actual component being supplied rather than combining the measurements into one set.
3. Product Introduction
The 3500/72M Reciprocating Rod Position Monitor is intended for machinery applications in which the movement of a reciprocating rod must be monitored continuously. In reciprocating compressors, the rod and piston assembly moves back and forth during operation. Changes in rod position can provide useful information about mechanical wear, alignment, operating condition, and developing faults.
The monitor receives signals from compatible proximity transducers, processes the incoming signals, and calculates measurements according to the configured monitoring functions. These measurements can then be assessed against user-defined alarm thresholds. When a monitored value reaches a configured limit, the 3500 system can report the abnormal condition and initiate the appropriate response through the configured protection system.
The associated 135489-01 I/O module provides the required internal-barrier and internal-termination arrangement for compatible installations. This is particularly relevant where the instrument interface must meet the installation requirements for the connected field devices and wiring.
Together, the monitor and its compatible I/O hardware form part of an integrated machinery monitoring arrangement. Correct operation depends on the complete system configuration, including the transducers, rack, wiring, module settings, and alarm logic.
4. Product Applications
4.1 Reciprocating compressors
One of the principal applications of the 3500/72M is the monitoring of reciprocating compressors used in gas transmission, gas processing, refining, petrochemical production, and industrial gas services.
Rod-position measurements can help maintenance teams identify changes in the movement of the rod and investigate abnormal operating conditions before they develop into more serious mechanical problems.
4.2 Oil and gas facilities
In oil and gas facilities, reciprocating compressors may operate continuously under demanding pressure and load conditions. Monitoring rod movement provides an additional source of information for evaluating machinery condition and planning maintenance.
The 3500 system can be integrated into a wider machinery protection arrangement, subject to the site’s engineering design and approved configuration.
4.3 Petrochemical and chemical plants
Chemical and petrochemical plants often rely on compressors and other reciprocating equipment to maintain stable process flow. Continuous monitoring helps operators assess equipment condition and identify deviations from established operating patterns.
4.4 Gas processing and pipeline stations
Pipeline compression stations may contain critical compressors that operate for extended periods. A rod-position monitoring system can support condition-based maintenance by providing measurements that can be reviewed alongside vibration, temperature, pressure, and process data.
4.5 Industrial maintenance and equipment refurbishment
The module may also be required during planned maintenance, rack refurbishment, fault investigation, or replacement of an existing monitoring component. In these situations, matching the part number and hardware configuration is essential to maintain compatibility with the installed system.
5. Product Advantages
5.1 Continuous monitoring
The 3500/72M is designed for continuous online monitoring rather than relying exclusively on occasional manual inspections. This allows machinery measurements to be observed while the equipment is operating under normal process conditions.
5.2 Dedicated reciprocating machinery monitoring
The module is designed specifically for reciprocating rod-position monitoring. Its application-specific measurement functions make it relevant to compressor installations where rod movement is an important condition indicator.
5.3 Configurable measurement and alarm functions
Monitoring functions and alarm thresholds can be configured according to the machinery requirements and the installed system setup. This helps maintenance and operations personnel distinguish normal operating variations from conditions that require investigation.
5.4 Integration with the 3500 platform
The monitor operates as part of a rack-based monitoring architecture. This supports integration with other compatible 3500 modules, system configuration tools, and the wider machinery monitoring arrangement.
5.5 Visible module status
The monitor’s front-panel status indicators provide information about module health, communication activity, and bypass status. These indications can help technicians perform initial checks during troubleshooting and maintenance.
5.6 Internal-barrier I/O option
The 135489-01 I/O module provides internal barriers and internal terminations. When the application requires this option, it can help simplify the arrangement of field wiring and support the approved interface between the monitoring rack and compatible transducers.
5.7 Support for maintenance planning
Trend information and alarm records can help maintenance personnel investigate changes in machine behaviour, compare operating conditions, and decide when further inspection is appropriate. The monitoring system supports engineering judgement; it does not replace a complete mechanical inspection or an approved protection design.
6. Recommended Related Models in the Same Series
The following five models are relevant to a 3500-series machinery protection installation. They perform different functions, so they should be selected according to the parameter that needs to be measured rather than treated as direct replacements for the 3500/72M.
Dimensions and weights below refer to the monitor module where a standard value is available. Exact dimensions can vary by hardware revision and configuration; verify the required part number before procurement.
| Model | Main function | Typical inputs or measurements | Dimensions (H × W × D) | Weight (kg) |
|---|---|---|---|---|
| 3500/70M | Reciprocating compressor impulse and velocity monitoring | Compatible velocity or acceleration signals, depending on configuration | Approx. 241.3 × 24.4 × 241.8 mm | Approx. 0.91 |
| 3500/42M | Proximitor/seismic monitoring | Radial vibration, axial position, eccentricity, and other supported measurements | Approx. 241.3 × 24.4 × 241.8 mm | Approx. 0.91 |
| 3500/25 | Keyphasor monitoring | Shaft reference and phase-related signals | Verify exact module revision | Verify |
| 3500/50 | Tachometer monitoring | Speed, zero-speed, and other supported speed-related measurements | Verify exact module revision | Verify |
| 3500/77M | Reciprocating compressor cylinder-pressure monitoring | Compatible cylinder-pressure transducer signals | Verify exact module revision | Verify |
These models complement different parts of a machinery monitoring system. The 3500/70M is relevant to reciprocating compressor impulse and velocity measurements, while the 3500/42M is intended for a broader range of vibration and position measurements. The 3500/25 and 3500/50 address shaft reference and speed-related measurements, respectively. The 3500/77M is relevant when cylinder-pressure monitoring is required.
They are related products, not automatic substitutes. Any change in monitor type should be assessed against the required measurements, transducer type, wiring, rack configuration, and protection logic.
7. Five Popular Bently Nevada Models
The following models are commonly encountered in 3500-series machinery protection systems. They cover power supply, rack communication, vibration, speed, and temperature monitoring functions.
| Model | Product type | Main function | Typical system use | Dimensions (H × W × D) | Weight (kg) |
|---|---|---|---|---|---|
| 3500/15 | Power supply module | Supplies power to compatible 3500 rack modules | Rack power and redundant supply arrangements | Approx. 120.7 × 50.8 × 251.5 mm | Approx. 1.39 |
| 3500/22M | Rack interface module | Rack communication and system interface functions | Data exchange and monitoring-system integration | Verify exact revision | Verify |
| 3500/42M | Proximitor/seismic monitor | Vibration and position monitoring | Rotating machinery protection | Approx. 241.3 × 24.4 × 241.8 mm | Approx. 0.91 |
| 3500/50 | Tachometer monitor | Speed and related rotational measurements | Rotating machinery speed monitoring | Verify exact revision | Verify |
| 3500/60 | Temperature monitor | Temperature measurement and alarm monitoring | Bearings, process equipment, and other temperature-monitored points | Verify exact revision | Verify |
The 3500/15 supplies rack power, whereas the 3500/22M provides rack interface functions. The 3500/42M is used for vibration and position measurements, while the 3500/50 and 3500/60 cover speed and temperature monitoring.
The dimensions and weights of the 3500/15 refer to the power supply module, not its separate power input module. For models marked “Verify,” the exact revision and part number should be checked before using the values for cabinet layout, shipping, or replacement planning.
8. Installation and Compatibility Considerations
Before installing or replacing the 3500/72M and 135489-01 components, check the following points.
– Confirm both part numbers. Verify the monitor label and the I/O module label separately. A matching series designation alone does not guarantee compatibility.
– Check the I/O option. The 135489-01 includes internal barriers and internal terminations. Confirm that this is the correct option for the existing rack and field wiring.
– Verify the transducers. The installed proximity transducers must be compatible with the monitor’s supported input arrangement and the intended measurement function.
– Check the channel configuration. Ensure that channel assignments and paired-channel functions match the monitoring requirements.
– Review alarm settings. Confirm the configured Alert and Danger thresholds and verify that the resulting actions are consistent with the plant’s approved protection philosophy.
– Inspect rack and wiring conditions. Check module seating, connectors, cable condition, grounding, shielding, and the correct routing of field wiring.
– Confirm environmental requirements. Check the permitted operating temperature and installation conditions for the exact monitor and I/O configuration.
– Validate the replacement before returning to service. Follow the site’s maintenance procedures for configuration checks, signal verification, alarm testing, and any required commissioning tests.
9. Ordering and Replacement Checklist
| Check item | What to confirm |
|---|---|
| Main model | 3500/72M-03-00 |
| Main monitor part number | 176449-08 |
| Associated I/O part number | 135489-01 |
| Product series | 3500 Series |
| Monitor function | Reciprocating rod-position monitoring |
| I/O arrangement | Internal barriers and internal terminations |
| Rack compatibility | Correct rack and slot arrangement |
| Transducer compatibility | Approved proximity transducer type |
| Configuration | Channel assignments and required monitoring functions |
| Physical fit | Dimensions and clearance for the exact module revision |
| Weight | Confirm the monitor and I/O module weights separately |
| Condition | Confirm whether the supplied unit is new, refurbished, or used |
| Documentation | Confirm that the applicable installation and configuration information is available |
10. Conclusion
The Bently Nevada 3500/72M-03-00, part number 176449-08, is a reciprocating rod-position monitoring module in the 3500 Series machinery protection platform. It is designed to process compatible proximity-transducer signals and provide configured measurements and alarm functions for reciprocating machinery, particularly compressors.
The associated 135489-01 is an I/O module with internal barriers and internal terminations. Its role is different from that of the main monitor, and its physical dimensions and weight must be considered separately.
For a replacement purchase, the most important checks are the complete part numbers, the monitor and I/O configuration, transducer compatibility, rack installation requirements, and the exact physical specifications of the supplied hardware. These checks help ensure that the replacement matches the existing system and its intended monitoring function.