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- 991-25-70-01-CN
- Vibration Transmitter
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Bently Nevada 991-25-70-01-CN Proximity Transducer System Product Detailed Introduction
1. Product Basic Information
| Item | Description |
|---|---|
| Model | 991-25-70-01-CN |
| Brand | Bently Nevada |
| Product Series | 991 Series Proximity Transducer System |
| Product Type | Eddy Current Proximity Sensor System |
| Measurement Technology | Non-contact eddy current displacement measurement |
| Main Function | Shaft vibration measurement, radial displacement monitoring, position detection |
| Application Field | Rotating machinery condition monitoring and protection |
| Installation Method | Threaded probe installation |
| Measurement Object | Conductive rotating shaft surfaces |
| System Structure | Proximity probe + extension cable + signal processing interface |
| Signal Output | Linear proportional voltage signal |
| Operation Mode | Continuous online monitoring |
| Typical Equipment | Turbines, compressors, pumps, generators, motors and other rotating machinery |
2. Product Introduction
The Bently Nevada 991-25-70-01-CN is an industrial-grade eddy current proximity transducer system designed for monitoring the operating condition of rotating machinery. It belongs to the 991 Series proximity measurement product family and is mainly used for accurate shaft vibration, displacement and position measurement.
The product uses advanced non-contact eddy current sensing technology. During operation, the probe generates a high-frequency electromagnetic field near the rotating shaft surface. The change in distance between the probe and the shaft modifies the electromagnetic field, and the system converts this change into a stable electrical output signal.
The 991-25-70-01-CN provides reliable measurement performance for critical machinery where continuous monitoring is required. Because the sensor does not physically contact the rotating component, it avoids mechanical wear and provides long-term operational stability.
This model is designed for industrial applications requiring accurate monitoring of shaft movement, rotor vibration and machine operating conditions. It is commonly installed on high-value rotating equipment where equipment reliability and operational safety are important.
The 991-25-70-01-CN configuration is suitable for users requiring a standard 70 mm probe length arrangement combined with a reliable proximity measurement system for machinery protection and predictive maintenance applications.
3. Product Working Principle
The Bently Nevada 991-25-70-01-CN works according to the principle of eddy current displacement measurement.
The probe tip contains an electromagnetic coil that generates a high-frequency magnetic field. When the probe is positioned close to a conductive metal target, such as a rotating machine shaft, eddy currents are created inside the target material.
As the shaft moves due to vibration, thermal expansion, mechanical load changes or alignment variations, the distance between the probe and shaft changes.
The electronic circuit detects the resulting electromagnetic changes and converts them into an electrical signal proportional to the shaft displacement.
This measurement method provides several benefits:
- Accurate measurement of very small shaft movements
- No physical contact with rotating components
- Fast response to vibration changes
- Stable operation during continuous monitoring
- Reduced maintenance requirements
4. Detailed Product Parameters
| Parameter | Specification |
|---|---|
| Model | 991-25-70-01-CN |
| Series | 991 Series |
| Sensor Type | Eddy Current Proximity Transducer |
| Measurement Principle | Electromagnetic eddy current sensing |
| Measurement Type | Non-contact displacement measurement |
| Probe Diameter | Approx. 8 mm |
| Probe Length | Approx. 70 mm |
| Thread Installation | Industrial threaded mounting structure |
| Measurement Range | Approx. 2 mm linear operating range |
| Output Signal | Proportional voltage output |
| Frequency Response | Suitable for rotating machinery vibration measurement |
| Target Material | Conductive metal shaft surface |
| Operating Temperature | Approximately -35°C to +180°C depending on system configuration |
| Cable Type | Shielded industrial extension cable |
| Power Supply | Supplied by compatible monitoring equipment |
| Installation Environment | Industrial rotating equipment environment |
| Calibration | Factory calibrated proximity measurement system |
| Protection Design | Resistant to industrial vibration and operating conditions |
| Application Function | Shaft vibration, displacement and position monitoring |
| Communication Method | Analog signal transmission |
| Dimensions | Approx. probe diameter 8 mm × probe length 70 mm (configuration dependent) |
| Weight | Approx. 0.15 kg |
5. Product Applications
5.1 Steam Turbine Monitoring
The 991-25-70-01-CN is widely used for steam turbine rotor monitoring.
During turbine operation, problems such as shaft imbalance, bearing wear, rotor bending and alignment deviation may cause abnormal shaft movement.
The proximity transducer continuously measures shaft displacement and provides important information for machinery protection and maintenance decisions.
5.2 Gas Turbine Monitoring
Gas turbines operate under high-speed and high-temperature conditions.
The product provides reliable shaft vibration measurement, helping operators detect abnormal rotor movement and maintain stable equipment operation.
5.3 Compressor Monitoring
Industrial compressors often operate continuously under heavy loads.
The 991-25-70-01-CN can monitor compressor shaft vibration and displacement conditions, helping identify:
- Rotor instability
- Mechanical imbalance
- Bearing problems
- Coupling misalignment
- Excessive shaft movement
5.4 Pump Monitoring
Large industrial pumps require accurate vibration monitoring to avoid unexpected failures.
The product can detect early mechanical changes and support preventive maintenance programs.
5.5 Generator Monitoring
Generators require stable rotor operation.
The sensor system provides continuous shaft movement information, helping improve equipment reliability and reduce downtime.
5.6 Other Industrial Applications
The product can also be used for:
- Electric motors
- Gearboxes
- Centrifugal machines
- Hydraulic turbines
- Process machinery
- High-speed rotating equipment
6. Product Advantages
6.1 Non-Contact Measurement Technology
The sensor does not directly touch the rotating shaft.
This eliminates mechanical friction and wear, improving service life and measurement stability.
6.2 High Measurement Accuracy
The eddy current measurement principle allows detection of small shaft movements, making it suitable for precision machinery monitoring.
6.3 Excellent Long-Term Stability
The product is designed for continuous operation and can maintain reliable measurement performance over extended periods.
6.4 Fast Response Capability
The system can quickly detect vibration and displacement changes, allowing timely equipment condition evaluation.
6.5 Suitable for Harsh Industrial Environments
The product can operate effectively in environments with:
- Continuous vibration
- Temperature variation
- Mechanical stress
- Long operating cycles
6.6 Improved Equipment Protection
By continuously monitoring shaft movement, the system helps identify abnormal conditions before serious equipment damage occurs.
6.7 Reduced Maintenance Requirements
Because the probe uses non-contact measurement technology, routine mechanical replacement caused by sensor wear is reduced.
7. Product Series Introduction
The Bently Nevada 991 Series is an industrial proximity measurement product family designed for rotating machinery monitoring.
The series is mainly used for:
- Shaft vibration measurement
- Rotor displacement monitoring
- Axial position measurement
- Speed and phase-related monitoring applications
- Machinery condition analysis
The 991 Series features a compact structure, reliable performance and compatibility with industrial monitoring systems.
Typical industries using this series include:
- Power generation
- Petrochemical
- Oil and gas
- Manufacturing
- Heavy machinery
- Process industries
8. Recommended Same Series or Related Models
| Model | Series | Main Parameters | Application | Dimensions | Weight kg |
|---|---|---|---|---|---|
| 991-25-70-01-CN | 991 Series | 8 mm eddy current proximity probe, 70 mm length configuration, shaft displacement monitoring | General rotating machinery | Approx. 8 mm diameter × 70 mm length | 0.15 kg |
| 991-25-70-01-01 | 991 Series | Standard proximity measurement system, vibration and displacement monitoring | Turbines and compressors | Approx. 8 mm diameter × 70 mm length | 0.15 kg |
| 991-25-70-01-05 | 991 Series | Industrial proximity transducer configuration, continuous shaft monitoring | Rotating equipment protection | Approx. 8 mm diameter × 70 mm length | 0.15 kg |
| 991-25-50-01-CN | 991 Series | Short probe design for limited installation space | Compact machinery | Approx. 8 mm diameter × 50 mm length | 0.12 kg |
| 991-25-90-01-CN | 991 Series | Extended probe configuration for special mounting conditions | Large equipment installation | Approx. 8 mm diameter × 90 mm length | 0.18 kg |
9. Recommended Popular Models from the Same Brand
| Model | Product Series | Main Parameters | Application | Dimensions | Weight kg |
|---|---|---|---|---|---|
| 3300 XL 8 mm Probe System | 3300 XL Series | High accuracy 8 mm eddy current vibration measurement probe system | Turbines, compressors and generators | Approx. 8 mm diameter, length depends on configuration | 0.15 kg |
| 3500/42M Proximity Monitor | 3500 Series | Multi-channel vibration and position monitoring module | Machinery protection system | Approx. 241 mm × 24 mm × 120 mm | 1.20 kg |
| 3500/25 Keyphasor Module | 3500 Series | Rotor speed and phase reference monitoring module | Speed and position measurement | Approx. 241 mm × 24 mm × 120 mm | 0.35 kg |
| 3300 XL Extension Cable | 3300 XL Series | High-temperature extension cable for proximity probe systems | Industrial monitoring applications | Various lengths available | 0.30 kg |
| 3500/05 Rack System | 3500 Series | Modular machinery monitoring rack platform | Complete condition monitoring systems | Approx. 482 mm × 133 mm × 350 mm | 8.00 kg |
10. Model Selection Recommendation
| Application Requirement | Recommended Model |
|---|---|
| Standard shaft vibration monitoring | 991-25-70-01-CN |
| General rotating machinery monitoring | 991-25-70-01-01 |
| Industrial continuous operation monitoring | 991-25-70-01-05 |
| Compact installation location | 991-25-50-01-CN |
| Long probe installation requirement | 991-25-90-01-CN |
| High-performance vibration monitoring | 3300 XL 8 mm Probe System |
| Complete machinery protection solution | 3500 Series Monitoring System |
11. Product Summary
The Bently Nevada 991-25-70-01-CN is a reliable proximity transducer system designed for industrial rotating machinery monitoring.
As part of the 991 Series, it provides accurate shaft displacement and vibration measurement using proven eddy current technology.
The product combines non-contact operation, high measurement accuracy, strong environmental adaptability and long operating life.
It is suitable for applications including turbines, compressors, pumps, generators and other critical rotating equipment.
Through continuous monitoring of shaft movement and vibration conditions, the 991-25-70-01-CN helps improve machinery reliability, optimize maintenance schedules and reduce unexpected equipment failures.
Its stable performance and flexible installation design make it a practical solution for industrial condition monitoring applications requiring dependable shaft measurement.