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- Bently Nevada
- 991-25-50-03-05
- Vibration Transmitter
- USA
- 112 × 38 mm
- 0.45kg
- Xiamen, China
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Bently Nevada 991-25-50-03-05
Comprehensive Product Overview, Technical Specifications, Product Applications, Advantages, Series Information, and Recommended Models
Product Overview
The Bently Nevada 991-25-50-03-05 is a compact industrial vibration transmitter designed for permanent installation on rotating machinery and industrial process equipment. It is developed for applications where continuous vibration monitoring, reliable measurement performance, stable signal transmission, and simplified machinery condition assessment are required.
The transmitter belongs to the 991 Series, which is designed for industrial machinery condition monitoring applications. The product provides continuous measurement of machine housing vibration and converts vibration information into a standardized 4–20 mA analog current output, allowing direct connection with industrial monitoring systems, automation equipment, and process control platforms.
The 991-25-50-03-05 integrates vibration sensing, electronic signal processing, and output conversion functions into one compact transmitter housing. This integrated design reduces the complexity of vibration monitoring systems, simplifies installation, improves measurement consistency, and provides reliable long-term operation.
The transmitter is designed for mounting directly on rotating machinery, including motors, pumps, compressors, fans, blowers, gearboxes, turbines, and other industrial equipment. During machine operation, it continuously measures vibration conditions and provides important information about equipment health and operating stability.
Vibration is one of the most valuable indicators for evaluating the mechanical condition of rotating equipment. Changes in vibration level, vibration trend, or vibration behavior may indicate developing problems such as bearing degradation, rotor imbalance, shaft misalignment, mechanical looseness, coupling wear, lubrication problems, or structural resonance.
By continuously monitoring vibration conditions, the transmitter helps maintenance personnel identify abnormal operating conditions at an early stage. This allows better maintenance planning, reduced unexpected downtime, improved equipment availability, and increased operational reliability.
The compact structure makes the transmitter suitable for installations where available mounting space is limited. The industrial-grade construction allows stable operation in demanding environments involving mechanical vibration, temperature variation, humidity, dust, oil contamination, and electrical interference.
The 991-25-50-03-05 is suitable for industrial facilities requiring dependable vibration monitoring, predictive maintenance support, and improved protection of rotating machinery.
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 | 991-25-50-03-05 |
| 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 Application | Rotating Machinery Condition Monitoring |
Product Series Information
The 991 Series is a compact industrial vibration transmitter family designed for continuous monitoring of rotating machinery.
The series provides a practical and efficient solution for industrial condition monitoring by combining vibration measurement, signal conditioning, and analog output transmission into a single integrated device.
The main purpose of the series is to provide continuous information about machine vibration conditions during operation. By monitoring vibration changes over time, users can evaluate equipment performance and identify early warning signs of mechanical deterioration.
The permanent installation capability allows continuous monitoring without interrupting normal machine operation. This provides more complete information compared with periodic manual vibration inspections.
The integrated design reduces the number of external components required and simplifies system configuration. This improves reliability while reducing installation complexity.
Main characteristics of the 991 Series include:
- Permanent machinery installation
- Continuous vibration measurement
- Integrated signal processing
- 4–20 mA analog output
- Compact industrial housing
- Stable long-term measurement performance
- Strong environmental resistance
- Low maintenance requirements
- Simple system integration
Typical monitored equipment includes:
- Electric motors
- Centrifugal pumps
- Compressors
- Industrial fans
- Blowers
- Gearboxes
- Turbine auxiliary systems
- Process machinery
- Cooling equipment
- Rotating production equipment
The series is widely used in industries where equipment reliability, production continuity, and maintenance efficiency are important.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 991-25-50-03-05 |
| 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 991-25-50-03-05 is designed to provide reliable vibration monitoring for industrial rotating machinery.
The transmitter combines vibration sensing and signal conversion into one compact device. This integrated structure reduces installation complexity and improves monitoring efficiency.
The standard 4–20 mA analog output enables direct connection with industrial monitoring systems and control equipment.
The vibration information can be used for:
- Machine condition monitoring
- Equipment performance evaluation
- Vibration trend tracking
- Alarm monitoring
- Maintenance planning
- Fault diagnosis assistance
The transmitter housing is designed for industrial environments and provides resistance against:
- Continuous mechanical vibration
- Dust contamination
- Moisture
- Oil exposure
- Temperature fluctuations
- Electrical interference
The internal electronics provide stable signal processing and maintain measurement accuracy during long-term operation.
The compact structure allows installation on various machine surfaces and supports applications where space availability is limited.
Product Advantages
Continuous Machine Monitoring
The transmitter provides continuous vibration measurement while equipment is operating, allowing operators to understand machine condition without stopping production.
Early Fault Detection
The device helps identify abnormal vibration patterns before they develop into serious equipment failures.
Possible detected conditions include:
- Bearing wear
- Rotor imbalance
- Shaft misalignment
- Mechanical looseness
- Coupling problems
- Excessive vibration
- Structural vibration issues
Reliable Industrial Operation
The rugged design allows stable operation under demanding industrial conditions including vibration, temperature changes, humidity, dust, and oil contamination.
Easy Integration
The standard 4–20 mA signal output provides compatibility with industrial monitoring and automation systems.
Compact Installation Design
The small transmitter structure allows installation in locations where larger monitoring equipment may not be suitable.
Reduced Maintenance Cost
Continuous vibration monitoring reduces unnecessary inspections and improves maintenance efficiency.
Supports Predictive Maintenance
The transmitter provides real-time equipment condition information, allowing maintenance decisions based on actual operating conditions.
Improved Equipment Protection
Early identification of abnormal vibration helps prevent major mechanical damage and improves machinery reliability.
Product Applications
The 991-25-50-03-05 is suitable for a wide range of industrial applications requiring permanent vibration monitoring.
Pump Monitoring
Typical applications include:
- Centrifugal pumps
- Process pumps
- Cooling water pumps
- Feed pumps
- Circulation pumps
- Transfer pumps
Motor Monitoring
Suitable for:
- Industrial electric motors
- Drive motors
- Fan motors
- Pump motors
- Auxiliary motors
Compressor Monitoring
Used for:
- Air compressors
- Gas compressors
- Refrigeration compressors
- Process compressors
Turbine Equipment Monitoring
Applicable to:
- Steam turbine auxiliary equipment
- Gas turbine systems
- Rotating power machinery
General Industrial Equipment
Suitable for:
- Gearboxes
- Fans
- Blowers
- Conveyors
- Cooling systems
- Mining machinery
- Chemical processing equipment
- Marine rotating equipment
- 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 |
| 991-25-50-02-05 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-06-50-01-05 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-06-70-03-EN | 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 991-25-50-03-05 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 analog 4–20 mA output transmission into one integrated device.
The transmitter provides stable measurement performance, compact dimensions, strong environmental resistance, and simple integration with industrial monitoring systems.
Through continuous vibration monitoring, it helps identify early mechanical problems such as imbalance, bearing deterioration, shaft misalignment, looseness, and abnormal machine operating conditions.
The 991-25-50-03-05 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 applications in power generation, petrochemical processing, manufacturing plants, mining operations, water treatment systems, marine equipment, and other industrial environments requiring dependable rotating machinery monitoring.