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- Bently Nevada
- 991-25-50-02-05
- Vibration Transmitter
- USA
- 112 × 38 mm
- 0.45kg
- Xiamen, China
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Bently Nevada 991-25-50-02-05
Comprehensive Product Overview, Technical Specifications, Product Applications, Advantages, Series Information, and Recommended Models
Product Overview
The Bently Nevada 991-25-50-02-05 is a compact industrial vibration transmitter designed for permanent installation on rotating machinery and industrial equipment requiring continuous condition monitoring.
This transmitter is developed for applications where accurate vibration measurement, reliable signal output, simple installation, and long-term operational stability are important. It provides continuous monitoring of machine housing vibration and converts the measured vibration signal into a standardized 4–20 mA analog current output, allowing convenient connection with industrial monitoring, automation, and control systems.
The 991-25-50-02-05 belongs to the 991 Series, which is designed for machinery condition monitoring applications. The series focuses on providing a practical and reliable method for monitoring rotating equipment health through continuous vibration measurement.
The transmitter integrates vibration sensing elements, signal processing electronics, and output conversion functions into a single compact industrial device. This integrated structure reduces system complexity, minimizes additional hardware requirements, improves installation efficiency, and provides stable measurement performance during long-term operation.
The device is designed for direct mounting on rotating machinery such as motors, pumps, compressors, fans, blowers, gearboxes, turbines, and other process equipment. During normal machine operation, the transmitter continuously measures vibration levels and provides information about equipment operating conditions.
Vibration monitoring is one of the most effective methods for evaluating the mechanical condition of rotating equipment. Changes in vibration amplitude, vibration trends, or abnormal vibration patterns may indicate developing mechanical issues, including bearing wear, rotor imbalance, shaft misalignment, mechanical looseness, coupling problems, lubrication problems, and structural vibration.
By providing continuous vibration monitoring, the transmitter supports predictive maintenance programs. Maintenance teams can identify early warning signals, schedule repairs more effectively, reduce unexpected equipment shutdowns, improve production reliability, and extend machinery service life.
The compact mechanical structure allows installation in locations with limited space. The industrial-grade design provides stable operation in demanding environments with continuous vibration, temperature changes, humidity, dust, oil contamination, and electrical interference.
The 991-25-50-02-05 is suitable for industrial applications requiring dependable vibration monitoring, efficient maintenance management, and improved rotating equipment reliability.
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 | 991-25-50-02-05 |
| Monitoring Method | Continuous Online Vibration Monitoring |
| Output Signal | 4–20 mA Analog Current Output |
| Installation Method | Direct Machine Mounting |
| Measurement Target | Machine Housing Vibration |
| Main Purpose | Machinery Condition Monitoring and Predictive Maintenance |
Product Series Information
The 991 Series is a compact vibration transmitter family designed for continuous monitoring of rotating industrial machinery.
The series provides a simple and effective solution by combining vibration measurement, electronic signal processing, and analog output transmission into a single integrated transmitter.
The main purpose of the series is to provide continuous information about machine vibration conditions while equipment is operating. By tracking vibration changes over time, users can evaluate machine health and identify potential mechanical problems before they become severe failures.
The permanent installation design allows continuous monitoring without interrupting production operations. This provides more complete operating information compared with temporary vibration measurement methods.
The integrated structure reduces system complexity and improves reliability by minimizing external components and simplifying installation requirements.
Main characteristics of the 991 Series include:
- Permanent installation capability
- Continuous vibration monitoring
- Integrated electronic signal processing
- Standard 4–20 mA analog output
- Compact industrial housing
- Stable measurement performance
- Strong environmental resistance
- Low maintenance requirements
- Easy integration with industrial systems
Typical monitored equipment includes:
- Electric motors
- Pumps
- Compressors
- Fans
- Blowers
- Gearboxes
- Turbine auxiliary equipment
- Process machinery
- Cooling systems
- Rotating production equipment
The series is widely used in industrial environments where equipment availability, reliability, and operational efficiency are important.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 991-25-50-02-05 |
| 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 991-25-50-02-05 is designed to provide reliable vibration monitoring for industrial rotating equipment.
The transmitter combines vibration detection and signal conversion into a single compact unit. This design improves system simplicity and reduces installation requirements.
The standard 4–20 mA analog output enables direct connection with industrial monitoring systems, allowing vibration information to be used for equipment condition analysis and maintenance decisions.
Main functional applications include:
- Continuous vibration monitoring
- Machine condition evaluation
- Equipment health assessment
- Vibration trend analysis
- Alarm monitoring
- Predictive maintenance support
The transmitter housing is designed for industrial environments and provides resistance against:
- Mechanical vibration
- Dust contamination
- Moisture
- Oil exposure
- Temperature fluctuations
- Electrical interference
The internal electronics provide stable signal processing and maintain consistent measurement performance during extended operation.
The compact design allows flexible installation on various types of machinery, including equipment where mounting space is limited.
Product Advantages
Continuous Real-Time Monitoring
The transmitter provides continuous vibration measurement during equipment operation, allowing operators to understand machine condition without stopping production.
Early Mechanical Fault Detection
The device helps identify abnormal vibration conditions before serious equipment damage occurs.
Common detectable problems include:
- Bearing deterioration
- Rotor imbalance
- Shaft misalignment
- Mechanical looseness
- Coupling damage
- Excessive vibration
- Structural vibration problems
Reliable Industrial Performance
The transmitter is designed for harsh industrial environments and provides stable operation under continuous vibration, temperature changes, humidity, and contamination.
Easy Integration with Control Systems
The standardized 4–20 mA output allows simple connection with industrial monitoring and automation systems.
Compact and Flexible Installation
The small physical size allows installation on different machine structures and in locations with limited available space.
Reduced Maintenance Requirements
Continuous monitoring reduces unnecessary manual inspections and allows maintenance teams to focus on equipment requiring attention.
Improved Predictive Maintenance Capability
The transmitter provides continuous vibration information, helping maintenance personnel make decisions based on actual machine operating conditions.
Improved Equipment Reliability
Early identification of abnormal vibration helps reduce unexpected failures, improve equipment availability, and extend machinery service life.
Product Applications
The 991-25-50-02-05 is suitable for many industrial rotating machinery monitoring applications.
Pump Applications
Typical monitored equipment includes:
- Centrifugal pumps
- Process pumps
- Cooling water pumps
- Feed pumps
- Circulation pumps
- Transfer pumps
Motor Applications
Suitable for:
- Industrial motors
- Drive motors
- Fan motors
- Pump motors
- Auxiliary motors
Compressor Applications
Used for:
- Air compressors
- Gas compressors
- Refrigeration compressors
- Industrial process compressors
Turbine Applications
Applicable to:
- Steam turbine auxiliary equipment
- Gas turbine systems
- Rotating power equipment
General Industrial Machinery Applications
Suitable for:
- Gearboxes
- Fans
- Blowers
- Conveyors
- Cooling equipment
- Mining machinery
- Chemical processing equipment
- Marine rotating systems
- Manufacturing 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 |
| 991-25-50-02-00 | 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 |
| 991-06-50-01-05 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-06-70-01-05 | 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 Acquisition | 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 991-25-50-02-05 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.
The transmitter provides stable measurement performance, compact installation dimensions, strong environmental resistance, and simple system integration.
Through continuous vibration monitoring, it helps identify early mechanical issues such as imbalance, bearing deterioration, shaft misalignment, mechanical looseness, and abnormal operating conditions.
The 991-25-50-02-05 supports predictive maintenance strategies by improving fault detection capability, reducing unexpected downtime, optimizing maintenance planning, protecting important machinery, and extending equipment operating life.
It is suitable for industrial applications including power generation, petrochemical processing, manufacturing facilities, mining operations, water treatment systems, marine equipment, and other environments requiring dependable rotating machinery monitoring.