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- Bently Nevada
- 288062-02
- 3500/50M Tachometer Module
- USA
- 241.3 × 24.4 × 241.8 mm
- 0.82 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Bently Nevada 288062-02 3500/50M Tachometer Module is a machinery monitoring module used in the Bently Nevada 3500 Series platform to acquire and process tachometer and speed-related signals. It is used where rotational speed, shaft rotation, and related machine timing information are required for machinery monitoring and protection functions.
In a typical rotating-equipment installation, a tachometer signal provides a reference for shaft speed and rotational position. This information can be used by the monitoring system to determine operating speed, verify rotational behavior, support speed-related alarms, and provide a reference for other vibration measurements. The 3500/50M therefore sits between the machine’s speed-sensing devices and the wider machinery monitoring system.
The module is particularly relevant to turbines, compressors, pumps, motors, generators, and other rotating assets where accurate speed information is needed for condition monitoring. A correctly configured tachometer channel can also provide an important reference when vibration measurements are interpreted against machine operating speed.
The 288062-02 is installed as part of a complete 3500 Series rack architecture. Its practical function depends on the associated tachometer sensors, wiring, rack configuration, monitoring modules, and system software.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 288062-02 |
| Product Type | 3500/50M Tachometer Module |
| Product Family | Bently Nevada 3500 Series |
| Series | 3500 |
| Module Type | Tachometer Module |
| Primary Function | Speed and Tachometer Signal Monitoring |
| Measurement Function | Rotational Speed / Timing |
| Input Source | Tachometer / Speed Sensors |
| Application | Rotating Machinery Monitoring |
| Target Equipment | Turbines, Compressors, Pumps, Motors, Generators |
| System Integration | Bently Nevada 3500 Series |
| Installation | 3500 Series Rack |
| Dimensions | 241.3 × 24.4 × 241.8 mm |
| Weight | 0.82 kg |
Product Features
- Provides tachometer and rotational-speed monitoring within the 3500 Series platform.
- Accepts speed-related information from associated machinery sensors.
- Supplies rotational-speed information for machinery monitoring applications.
- Can be used as a speed reference for interpreting other machine measurements.
- Supports speed-related monitoring and alarm functions within the configured system.
- Suitable for turbines, compressors, generators, motors, pumps, and other rotating assets.
- Integrates with the broader Bently Nevada 3500 Series machinery protection architecture.
Working Principle
The 3500/50M Tachometer Module processes signals from tachometer or speed-sensing devices installed on rotating machinery. The resulting speed information is then made available to the 3500 Series monitoring architecture.
1. Shaft rotation
The monitored machine produces a rotating shaft signal that changes according to machine speed. A suitable tachometer or speed sensor detects this rotational behavior.
2. Sensor signal
The speed sensor generates electrical pulses or another speed-related signal corresponding to shaft rotation. The quality of this signal depends on correct sensor installation, target condition, wiring, and machine operation.
3. Tachometer signal processing
The 288062-02 receives the associated tachometer input and processes the signal so that the monitoring system can determine the machine’s rotational behavior.
4. Speed monitoring
The resulting speed information can be used for configured monitoring functions such as speed indication, speed-related alarm logic, and machine operating-state assessment.
5. Reference for machinery analysis
Rotational speed is also an important reference when interpreting vibration measurements. Changes in vibration amplitude or frequency can have different meanings at different machine speeds, so accurate tachometer information helps provide operating context.
Role in a Bently Nevada 3500 Series Machinery Protection Architecture
The 3500/50M occupies the speed-monitoring layer of the 3500 Series rack. It receives information from machine speed sensors and supplies the monitoring system with rotational-speed data that can be used alongside vibration and other machinery measurements.
| Architecture Layer | Function |
|---|---|
| Rotating Machine | Produces shaft rotation and operating speed |
| Tachometer / Speed Sensor | Detects rotational movement and generates the speed signal |
| Field Wiring | Transfers the sensor signal to the monitoring rack |
| 3500/50M Tachometer Module | Processes tachometer and speed-related signals |
| 3500 Series Rack | Provides system-level hardware integration |
| Machinery Monitoring System | Uses speed information with other condition measurements |
| Operator / Maintenance Interface | Displays operating and diagnostic information |
Industrial Applications
| Application | Typical Use |
|---|---|
| Steam Turbines | Monitoring shaft speed during startup and normal operation |
| Gas Turbines | Providing speed information for rotating machinery monitoring |
| Compressors | Tracking compressor shaft speed and operating condition |
| Generators | Monitoring rotational speed of generating equipment |
| Large Motors | Monitoring motor rotational behavior |
| Pumps | Providing speed reference for rotating equipment monitoring |
| Rotating Process Equipment | Supporting speed-related machinery protection functions |
| Power Generation | Integrating tachometer information into machinery monitoring systems |
Installation and Maintenance
- Confirm rack assignment — Verify that the 288062-02 is installed in the intended 3500 Series rack position according to the system documentation.
- Check sensor compatibility — Confirm that the connected tachometer or speed sensors are suitable for the configured monitoring application.
- Review wiring documentation — Verify sensor tags, input assignments, terminal references, and cable routing before commissioning.
- Apply electrical isolation — Follow the plant’s approved isolation procedures before handling field wiring or rack connections.
- Inspect the speed sensor — Check sensor mounting, target condition, mechanical clearance, and physical condition where applicable.
- Verify field wiring — Inspect cables and terminations for loose connections, damage, corrosion, or incorrect identification.
- Confirm channel configuration — Ensure the monitoring system configuration corresponds to the installed tachometer input arrangement.
- Check the speed signal — Verify that the module receives a consistent signal during the appropriate machine operating condition.
- Compare displayed speed — Where an independent reference is available, compare the monitored speed with the expected machine speed.
- Review speed-related alarms — Investigate unexpected overspeed, underspeed, missing-speed, or unstable-speed indications systematically.
- Check the complete signal path — If speed information is unavailable, inspect the sensor, wiring, module connections, rack configuration, and system settings.
- Document changes — Record sensor replacements, wiring changes, configuration modifications, and maintenance findings for future troubleshooting.
Related Components
| Component | Function in the System |
|---|---|
| Bently Nevada 3500/50M | Tachometer and speed monitoring module |
| Tachometer Sensors | Detect shaft rotation and generate speed signals |
| Proximity Sensors | Provide rotational reference information in applicable installations |
| 3500 Series Rack | Houses and integrates monitoring modules |
| Vibration Monitoring Modules | Provide complementary machinery vibration measurements |
| Keyphasor / Speed Reference Devices | Supply rotational timing references where applicable |
| 3500 Series Power Supply | Provides system power for the monitoring rack |
| Machinery Monitoring Software | Supports configuration, indication, and diagnostic functions |
Recommended Related Models
| Model | Product Type | Typical Relationship |
|---|---|---|
| Bently Nevada 288062-01 | 3500/50M Tachometer Module | Related 3500/50M configuration |
| Bently Nevada 3500/42M | Proximitor / Seismic Monitor | Related machinery monitoring module |
| Bently Nevada 3500/22M | Transient Data Interface Module | Related 3500 Series system interface |
| Bently Nevada 3500/25 | Enhanced Keyphasor Module | Related rotational reference module |
| Bently Nevada 3500/40M | Proximitor Monitor | Related rotating machinery monitoring module |
Key Advantages
- Provides dedicated tachometer and speed monitoring within the 3500 Series.
- Supplies essential rotational-speed information for machinery monitoring.
- Supports speed-related alarm and monitoring functions.
- Provides useful operating-speed context for vibration analysis.
- Fits established Bently Nevada machinery protection architectures.
- Suitable for a wide range of industrial rotating equipment.
Technical FAQs
What does the 3500/50M Tachometer Module monitor?
The 3500/50M monitors tachometer and speed-related signals from rotating machinery. It provides rotational-speed information that can be used by the 3500 Series machinery monitoring architecture.
Why is tachometer information important for vibration monitoring?
Machine vibration is closely related to operating speed. A tachometer signal establishes the rotational-speed reference needed to interpret vibration behavior correctly, particularly when machine speed changes during startup, shutdown, or varying operating conditions.
What can cause an unstable or missing tachometer signal?
Possible causes include a problem with the speed sensor, incorrect sensor installation, damaged wiring, poor termination, an unsuitable target condition, or incorrect system configuration. The complete sensor-to-monitoring path should be checked rather than replacing the module immediately.
Can the 3500/50M be used with other machinery monitoring modules?
Yes. The 3500/50M is intended to operate as part of the broader 3500 Series architecture. Its speed information can be used alongside other monitoring measurements, depending on the system configuration and the requirements of the monitored machine.