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- 991-25-70-02-00
- Vibration Transmitter
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Bently Nevada 991-25-70-02-00 Proximity Transducer System Product Detailed Introduction
1. Product Basic Information
| Item | Description |
|---|---|
| Model | 991-25-70-02-00 |
| Brand | Bently Nevada |
| Product Series | 991 Series Proximity Transducer System |
| Product Type | Eddy Current Proximity Transducer |
| Measurement Technology | Non-contact eddy current displacement measurement |
| Main Function | Shaft vibration monitoring, radial displacement measurement, rotor position detection |
| Application Field | Rotating machinery condition monitoring and protection |
| Installation Method | Threaded probe mounting |
| Measurement Object | Conductive rotating shaft surface |
| System Structure | Proximity probe + extension cable + signal conditioning unit |
| Signal Output | Linear analog proportional voltage signal |
| Operation Mode | Continuous online measurement |
| Typical Equipment | Steam turbines, gas turbines, compressors, pumps, motors, generators |
2. Product Introduction
The Bently Nevada 991-25-70-02-00 is a precision proximity transducer system designed for industrial rotating machinery monitoring applications. It belongs to the 991 Series proximity measurement product family and is mainly used for measuring shaft vibration, displacement changes and rotor movement conditions.
The product adopts advanced eddy current sensing technology, which allows the sensor to measure shaft movement without direct physical contact. By detecting changes in the electromagnetic field between the probe tip and the rotating shaft, the system converts mechanical displacement into a stable electrical output signal.
The 991-25-70-02-00 is designed for applications requiring continuous monitoring, high reliability and accurate vibration measurement. It is commonly installed on critical rotating equipment where early detection of mechanical problems is necessary to avoid unexpected shutdowns.
The 70 mm probe length configuration provides a flexible installation solution for many industrial machines. It allows the sensor to be installed in different mechanical structures while maintaining stable measurement performance.
The product is suitable for machinery protection systems, predictive maintenance programs and equipment condition analysis applications.
3. Working Principle
The Bently Nevada 991-25-70-02-00 operates using the principle of eddy current displacement measurement.
The probe contains an electromagnetic coil that generates a high-frequency electromagnetic field at the sensing tip.
When the probe is positioned near a conductive metal target, such as a rotating shaft, eddy currents are generated inside the target material.
The distance between the probe and shaft affects the electromagnetic field strength. When the shaft moves due to vibration, thermal expansion or mechanical load changes, the electrical characteristics of the sensor change accordingly.
The system processes these changes and converts them into a proportional voltage signal representing the actual shaft displacement.
This technology provides:
- Accurate shaft movement measurement
- Fast vibration response
- Reliable long-term operation
- No mechanical contact wear
- Excellent repeatability
4. Detailed Product Parameters
| Parameter | Specification |
|---|---|
| Model | 991-25-70-02-00 |
| Product Series | 991 Series |
| Sensor Type | Eddy Current Proximity Transducer |
| Measurement Principle | Eddy current electromagnetic sensing |
| Measurement Type | Non-contact displacement measurement |
| Probe Diameter | Approx. 8 mm |
| Probe Length | Approx. 70 mm |
| Mounting Type | Threaded industrial mounting |
| Measurement Range | Approx. 2 mm linear measurement range |
| Output Signal | Proportional voltage signal |
| Frequency Response | Suitable for rotating machinery vibration monitoring |
| Target Material | Conductive metal shaft surface |
| Operating Temperature | Approx. -35°C to +180°C depending on configuration |
| Cable Type | Shielded industrial extension cable |
| Signal Transmission | Analog signal transmission |
| Power Supply | Supplied by compatible monitoring equipment |
| Calibration | Factory calibrated proximity measurement system |
| Installation Environment | Industrial rotating equipment environment |
| Application Function | Shaft vibration, displacement and position monitoring |
| Housing Material | Industrial metal alloy construction |
| Protection Design | Designed for continuous industrial operation |
| Dimensions | Approx. probe diameter 8 mm × probe length 70 mm (configuration dependent) |
| Weight | Approx. 0.15 kg |
5. Product Applications
5.1 Steam Turbine Applications
The 991-25-70-02-00 is widely used for steam turbine monitoring.
Steam turbines operate under high rotational speeds and long continuous operating cycles. Small changes in rotor movement may indicate problems such as imbalance, misalignment or bearing degradation.
The product provides continuous measurement of:
- Shaft vibration
- Rotor displacement
- Mechanical movement
- Operating stability
This allows maintenance personnel to identify potential problems before serious equipment damage occurs.
5.2 Gas Turbine Applications
Gas turbines require accurate monitoring because they operate under extreme mechanical and thermal conditions.
The proximity transducer provides stable shaft displacement information and supports:
- Rotor condition analysis
- Vibration monitoring
- Equipment protection
- Preventive maintenance
5.3 Compressor Applications
Industrial compressors often operate continuously under high loads.
The product helps monitor compressor shaft movement and detect abnormal conditions including:
- Rotor imbalance
- Excessive vibration
- Bearing wear
- Shaft position changes
- Mechanical instability
5.4 Pump Applications
Large pumps used in industrial processes require reliable vibration monitoring.
The 991-25-70-02-00 can detect early mechanical changes and improve equipment reliability.
Common applications include:
- Centrifugal pumps
- Process pumps
- High-speed rotating pumps
5.5 Generator Applications
Generators require stable rotor operation to maintain efficient performance.
The product provides continuous rotor displacement measurement and supports machinery protection systems.
5.6 Other Industrial Applications
The product can also be applied in:
- Electric motors
- Gearboxes
- Fans
- Hydraulic turbines
- Centrifugal equipment
- Manufacturing machinery
- Process systems
6. Product Advantages
6.1 Non-Contact Measurement
The sensor uses electromagnetic measurement technology instead of mechanical contact.
Advantages include:
- No probe wear
- Reduced maintenance requirements
- Improved measurement stability
- Longer service life
6.2 High Measurement Precision
The eddy current sensing method provides accurate detection of very small shaft movement changes.
It is suitable for high-value rotating equipment requiring precise monitoring.
6.3 Stable Signal Performance
The system provides consistent output signals during continuous operation, supporting reliable machinery analysis.
6.4 Fast Dynamic Response
The product can quickly detect vibration and displacement variations, making it suitable for real-time monitoring.
6.5 Strong Industrial Adaptability
The product is designed for demanding environments involving:
- Mechanical vibration
- Temperature variation
- Long operating periods
- Industrial contamination
6.6 Supports Predictive Maintenance
Continuous monitoring allows operators to identify abnormal conditions earlier and arrange maintenance before equipment failure.
6.7 Easy Integration
The proximity transducer can be combined with industrial monitoring systems to provide complete machinery condition information.
7. Product Series Introduction
The Bently Nevada 991 Series is a professional proximity measurement product family designed for rotating machinery monitoring.
The series mainly focuses on:
- Shaft vibration measurement
- Radial displacement monitoring
- Rotor position measurement
- Mechanical condition evaluation
- Machinery protection applications
The 991 Series products are commonly used in industries where equipment reliability and continuous operation are essential.
Typical industries include:
- Power generation
- Petrochemical processing
- Oil and gas
- Heavy industry
- Manufacturing
- Process automation
8. Recommended Same Series or Related Models
| Model | Series | Main Parameters | Application | Dimensions | Weight kg |
|---|---|---|---|---|---|
| 991-25-70-02-00 | 991 Series | 8 mm eddy current proximity probe, 70 mm length, shaft vibration and displacement measurement | Rotating machinery monitoring | Approx. 8 mm diameter × 70 mm length | 0.15 kg |
| 991-25-70-01-01 | 991 Series | Standard proximity transducer configuration for vibration monitoring | Turbines, compressors, pumps | Approx. 8 mm diameter × 70 mm length | 0.15 kg |
| 991-25-70-01-05 | 991 Series | Continuous shaft monitoring proximity system | Machinery protection applications | Approx. 8 mm diameter × 70 mm length | 0.15 kg |
| 991-25-70-01-CN | 991 Series | Industrial 70 mm proximity measurement configuration | General rotating equipment | Approx. 8 mm diameter × 70 mm length | 0.15 kg |
| 991-25-50-02-00 | 991 Series | Compact proximity probe configuration for limited installation space | Small rotating machines | Approx. 8 mm diameter × 50 mm length | 0.12 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 eddy current vibration measurement system, 8 mm probe design | Turbines, compressors, generators | Approx. 8 mm diameter, length varies by configuration | 0.15 kg |
| 3500/42M Proximity Monitor | 3500 Series | Multi-channel vibration and position monitoring module | Machinery protection systems | Approx. 241 mm × 24 mm × 120 mm | 1.20 kg |
| 3500/25 Keyphasor Module | 3500 Series | Rotor speed and phase reference measurement module | Speed and phase monitoring | Approx. 241 mm × 24 mm × 120 mm | 0.35 kg |
| 3300 XL Extension Cable | 3300 XL Series | High-temperature extension cable for proximity probes | Industrial vibration applications | Various lengths available | 0.30 kg |
| 3500/05 Rack System | 3500 Series | Modular monitoring rack platform for multiple monitoring modules | Complete machinery monitoring system | Approx. 482 mm × 133 mm × 350 mm | 8.00 kg |
10. Model Selection Guide
| Application Requirement | Recommended Model |
|---|---|
| Standard shaft vibration monitoring | 991-25-70-02-00 |
| General industrial machinery monitoring | 991-25-70-01-01 |
| Continuous online monitoring | 991-25-70-01-05 |
| Compact installation requirements | 991-25-50-02-00 |
| High-performance vibration measurement | 3300 XL 8 mm Probe System |
| Complete machinery protection system | 3500 Series Monitoring System |
11. Product Summary
The Bently Nevada 991-25-70-02-00 is a high-reliability proximity transducer system designed for industrial rotating machinery condition monitoring.
As a member of the 991 Series, it provides accurate shaft vibration and displacement measurement through advanced eddy current technology.
The product features:
- Non-contact operation
- High measurement accuracy
- Stable signal output
- Long operating life
- Strong environmental adaptability
- Easy system integration
The 991-25-70-02-00 is suitable for turbines, compressors, pumps, generators and other critical rotating equipment.
By providing continuous information about shaft movement and vibration conditions, the product helps improve equipment reliability, optimize maintenance schedules and reduce unexpected downtime in industrial applications.