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- Bently Nevada
- 991-25-50-02-00
- Vibration Transmitter
- USA
- 112 × 38 mm
- 0.45kg
- Xiamen, China
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Bently Nevada 991-25-50-02-00
Comprehensive Product Overview, Technical Specifications, Product Applications, Advantages, Series Information, and Recommended Models
Product Overview
The Bently Nevada 991-25-50-02-00 is a compact industrial vibration transmitter designed for continuous monitoring of rotating machinery and critical mechanical equipment. It is developed for industrial applications where stable vibration measurement, reliable signal transmission, easy installation, and long-term operational reliability are required.
The transmitter belongs to the 991 Series, a family of permanent vibration monitoring devices designed for machinery condition monitoring. The product provides continuous measurement of machine casing vibration and converts the measured vibration signal into a standardized 4–20 mA analog current output, allowing convenient connection with industrial control systems, automation platforms, and machinery monitoring equipment.
The 991-25-50-02-00 combines vibration sensing technology, internal signal conditioning electronics, and signal conversion functions into one integrated industrial transmitter. This compact design simplifies system configuration, reduces installation complexity, improves measurement stability, and provides reliable long-term monitoring performance.
The transmitter is designed for direct installation on rotating equipment such as motors, pumps, compressors, fans, blowers, gearboxes, turbines, and other industrial machinery. During normal operation, the device continuously monitors vibration levels and provides important information regarding equipment operating conditions.
Vibration is one of the most important indicators used for evaluating the health condition of rotating machinery. Abnormal vibration increases or changes in vibration trends can indicate developing mechanical issues, including bearing deterioration, rotor imbalance, shaft misalignment, mechanical looseness, coupling wear, lubrication problems, and structural vibration.
Through continuous vibration monitoring, the transmitter supports predictive maintenance programs. Maintenance personnel can analyze equipment operating trends, identify potential problems before serious damage occurs, reduce unexpected downtime, improve maintenance efficiency, and extend machinery service life.
The compact design allows flexible installation in areas with limited mounting space. The industrial-grade housing provides stable operation under demanding environments including continuous vibration, temperature variation, humidity, dust, oil contamination, and electrical interference.
The 991-25-50-02-00 is suitable for industrial facilities requiring dependable vibration monitoring, improved equipment reliability, and efficient machinery maintenance management.
Brand Information
| Item | Description |
|---|---|
| Brand | Bently Nevada |
| Product Category | Industrial Vibration Transmitter |
| Product Type | Permanent Machinery Condition Monitoring Device |
| Product Series | 991 Series |
| Model Number | 991-25-50-02-00 |
| Monitoring Method | Continuous Online Vibration Monitoring |
| Output Signal | 4–20 mA Analog Current Output |
| Installation Method | Direct Machine Mounting |
| Measurement Target | Machine Housing Vibration |
| Application Purpose | Predictive Maintenance and Rotating Equipment Monitoring |
Product Series Information
The 991 Series is a compact industrial vibration transmitter family designed for permanent installation on rotating machinery.
The series provides a practical solution for monitoring equipment condition by integrating vibration sensing, signal processing, and analog output transmission into a single compact device.
The primary purpose of the series is to provide continuous vibration information from operating machinery. By monitoring vibration levels and changes over time, engineers can evaluate equipment condition and detect abnormal operating situations at an early stage.
The permanent installation capability allows continuous monitoring without interrupting equipment operation. Compared with temporary measurement methods, the transmitter provides more complete operational information and supports more accurate maintenance decisions.
The integrated transmitter structure reduces the number of external components required, simplifies system design, and improves overall monitoring reliability.
Main characteristics of the 991 Series include:
- Permanent machinery installation
- Continuous vibration measurement
- Integrated signal conditioning
- Standard 4–20 mA analog output
- Compact industrial structure
- Stable long-term performance
- Strong environmental resistance
- Low maintenance requirements
- Easy connection with industrial automation systems
Typical monitored equipment includes:
- Electric motors
- Centrifugal pumps
- Compressors
- Industrial fans
- Blowers
- Gearboxes
- Turbine auxiliary systems
- Cooling equipment
- Process machinery
- Rotating production equipment
The series is widely used in industries where equipment availability, production efficiency, and operational safety are important.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 991-25-50-02-00 |
| Product Type | Industrial Vibration Transmitter |
| Product Series | 991 Series |
| Measurement Principle | Velocity-Based Housing Vibration Measurement |
| Monitoring Mode | Continuous Online Monitoring |
| Output Signal | 4–20 mA Analog Current |
| Power Supply | 24 VDC Typical |
| Measurement Direction | Radial |
| Frequency Response | Approximately 10 Hz to 1000 Hz |
| Measurement Range | Industrial Rotating Machinery Vibration Monitoring |
| Accuracy | ±2% Full Scale (Typical) |
| Signal Conditioning | Integrated Electronic Processing |
| Response Time | Fast Dynamic Response |
| Output Characteristics | Linear Analog Current Output |
| Mounting Method | Stud Mount Installation |
| Electrical Connection | Industrial Connector |
| Housing Material | Stainless Steel |
| Protection Rating | IP65 (Typical) |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -55°C to +100°C |
| Electromagnetic Compatibility | Industrial EMC Protection |
| Signal Stability | High Long-Term Stability |
| Maintenance Requirement | Low Maintenance |
| Service Life | Designed for Continuous Industrial Operation |
| Dimensions | Approximately 112 × 38 mm |
| Weight (kg) | Approximately 0.45 kg |
Product Features
The 991-25-50-02-00 is designed to provide continuous vibration monitoring for rotating machinery operating in industrial environments.
The transmitter integrates vibration measurement and signal conversion functions into a single compact device. This design reduces system complexity and provides a convenient solution for permanent equipment monitoring.
The standard 4–20 mA analog output allows direct connection with industrial monitoring systems.
The vibration signal can be used for:
- Machine condition monitoring
- Equipment performance evaluation
- Alarm generation
- Vibration trend analysis
- Maintenance scheduling
- Fault diagnosis support
The transmitter housing provides resistance against:
- Continuous mechanical vibration
- Dust contamination
- Moisture
- Oil exposure
- Temperature fluctuations
- Electrical interference
The internal electronics provide stable signal processing and reliable measurement performance during long-term operation.
The compact structure allows installation on various machine surfaces, including applications where available mounting space is limited.
The transmitter is designed for continuous industrial operation with minimal maintenance requirements.
Product Advantages
Continuous Online Monitoring
The transmitter continuously measures machine vibration while equipment is operating, allowing operators to understand equipment condition without stopping production.
Early Fault Identification
The device helps detect abnormal vibration trends before they develop into major mechanical failures.
Typical issues that can be identified include:
- Bearing damage
- Rotor imbalance
- Shaft misalignment
- Mechanical looseness
- Coupling deterioration
- Excessive vibration
- Structural vibration problems
High Industrial Reliability
The rugged design provides stable operation under harsh industrial conditions, including mechanical stress, temperature changes, humidity, and contamination.
Simple Integration
The standard 4–20 mA output allows easy connection with existing industrial monitoring and control systems.
Compact Design
The small transmitter size allows flexible installation on different types of rotating equipment.
Low Maintenance Requirement
Continuous monitoring reduces unnecessary manual inspections and improves maintenance efficiency.
Supports Predictive Maintenance
The transmitter provides real-time vibration information that helps maintenance teams make decisions based on actual equipment condition.
Protects Critical Machinery
Early detection of abnormal vibration conditions helps prevent severe equipment damage and improves machinery availability.
Product Applications
The 991-25-50-02-00 is suitable for a wide range of industrial rotating equipment monitoring applications.
Pump Monitoring Applications
Typical equipment includes:
- Centrifugal pumps
- Process pumps
- Cooling pumps
- Feed pumps
- Circulation pumps
- Transfer pumps
Motor Monitoring Applications
Suitable for:
- Industrial motors
- Drive motors
- Fan motors
- Pump motors
- Auxiliary motors
Compressor Monitoring Applications
Used for:
- Air compressors
- Gas compressors
- Refrigeration compressors
- Industrial process compressors
Turbine Equipment Monitoring
Applicable to:
- Steam turbine auxiliary systems
- Gas turbine equipment
- Rotating power machinery
General Industrial Machinery
Suitable for:
- Gearboxes
- Fans
- Blowers
- Conveyors
- Cooling systems
- Mining equipment
- Chemical processing machinery
- Marine rotating equipment
- Manufacturing production machinery
Recommended Models from the Same Series or Related Series
| Model | Product Type | Output Signal | Power Supply | Frequency Response | Dimensions | Weight (kg) |
|---|---|---|---|---|---|---|
| 991-25-50-01-00 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-25-50-01-05 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-25-50-02-05 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-06-50-01-00 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-06-70-01-00 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
Popular Models from the Same Brand
| Model | Product Type | Main Function | Typical Application | Dimensions | Weight (kg) |
|---|---|---|---|---|---|
| 3300 XL 8 mm Proximitor Sensor | Proximity Sensor System | Shaft Position and Vibration Monitoring | Turbines, Compressors, Motors | Approx. 120 × 45 mm | Approx. 0.60 kg |
| 330103-00-05-10-02-00 | Proximity Probe | Shaft Displacement Measurement | Rotating Machinery Protection | Approx. 110 × 25 mm | Approx. 0.30 kg |
| 3500/22M | Monitoring Interface Module | Machinery Data Collection | Online Monitoring Systems | Approx. 241 × 24 × 242 mm | Approx. 0.80 kg |
| 3500/42M | Machinery Monitoring Module | Vibration and Position Monitoring | Critical Equipment Protection | Approx. 241 × 24 × 242 mm | Approx. 0.85 kg |
| 3500/40M | Machinery Monitoring Module | Shaft Position and Vibration Measurement | Industrial Rotating Equipment | Approx. 241 × 24 × 242 mm | Approx. 0.82 kg |
Product Summary
The Bently Nevada 991-25-50-02-00 is a compact industrial vibration transmitter designed for permanent installation on rotating machinery requiring continuous condition monitoring.
As part of the 991 Series, it combines vibration sensing, signal processing, and 4–20 mA analog output transmission into a single integrated device. This design provides a reliable and efficient solution for industrial machinery condition monitoring.
The transmitter offers stable measurement performance, compact dimensions, strong environmental resistance, and simple integration with industrial monitoring systems.
By continuously monitoring vibration conditions, it helps identify early mechanical problems such as imbalance, bearing deterioration, shaft misalignment, looseness, and abnormal operating conditions.
The 991-25-50-02-00 supports predictive maintenance strategies by improving fault detection, reducing unexpected downtime, optimizing maintenance planning, protecting important rotating equipment, and extending machinery operating life.
It is suitable for power generation, petrochemical processing, manufacturing plants, mining operations, water treatment systems, marine equipment, and other industrial environments requiring dependable rotating machinery monitoring.