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- Bently Nevada
- 991-25-50-01-00
- Vibration Transmitter
- USA
- 112 × 38 mm
- 0.45kg
- Xiamen, China
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Bently Nevada 991-25-50-01-00
Comprehensive Product Overview, Technical Specifications, Product Applications, Advantages, Series Information, and Recommended Models
Product Overview
The Bently Nevada 991-25-50-01-00 is a compact industrial vibration transmitter designed for continuous monitoring of rotating machinery and industrial equipment. It is developed for applications that require reliable vibration measurement, stable signal transmission, simple installation, and long-term operational performance.
The transmitter belongs to the 991 Series, which is designed as a permanent machinery condition monitoring solution for industrial rotating equipment. The product provides continuous measurement of machine casing vibration and converts the vibration signal into a standardized 4–20 mA analog current output, allowing easy connection with industrial monitoring systems, control systems, and automation platforms.
The 991-25-50-01-00 integrates vibration sensing, signal processing electronics, and output conversion functions into one compact transmitter unit. This integrated structure reduces system complexity, simplifies installation, improves measurement stability, and decreases the need for additional signal-conditioning equipment.
The transmitter is designed for direct installation on rotating machinery such as motors, pumps, compressors, fans, blowers, gearboxes, turbines, and process equipment. During equipment operation, it continuously measures vibration levels and provides information about the operating condition of the machine.
Vibration is a key indicator of rotating equipment health. Changes in vibration level, vibration trend, or operating pattern may indicate mechanical problems such as bearing wear, rotor imbalance, shaft misalignment, mechanical looseness, coupling problems, lubrication issues, or structural vibration.
By providing continuous vibration information, the transmitter supports predictive maintenance strategies. Maintenance personnel can monitor equipment condition, identify developing faults earlier, reduce unexpected failures, optimize maintenance schedules, and improve machinery reliability.
The compact structure allows flexible installation in areas with limited space. The industrial-grade design provides stable operation under demanding conditions, including continuous vibration, temperature changes, humidity, dust, oil contamination, and electrical interference.
The 991-25-50-01-00 is suitable for industrial environments where reliable vibration monitoring, equipment protection, and long-term operational stability are required.
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 | 991-25-50-01-00 |
| 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 Equipment Condition 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 simple and effective solution for machinery condition monitoring by combining vibration sensing, electronic signal processing, 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 normal operation. By monitoring vibration levels over time, engineers can identify abnormal operating conditions before they become serious mechanical failures.
The permanent installation design allows the transmitter to continuously monitor equipment without interrupting normal operation. This provides more complete operating condition information compared with periodic manual inspection methods.
The integrated structure reduces system complexity, improves reliability, and simplifies installation procedures.
Main characteristics of the 991 Series include:
- Permanent machinery installation
- Continuous vibration monitoring
- Integrated electronic processing
- Standard 4–20 mA analog output
- Compact industrial housing
- Stable measurement performance
- Strong environmental resistance
- Low maintenance requirements
- Easy connection with industrial monitoring systems
Typical monitored equipment includes:
- Electric motors
- Pumps
- Compressors
- Fans
- Blowers
- Gearboxes
- Turbine auxiliary equipment
- Cooling systems
- Process machinery
- Rotating production equipment
The series is widely used in industrial applications where machinery reliability and production continuity are important.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 991-25-50-01-00 |
| 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 991-25-50-01-00 is designed to provide continuous vibration monitoring for industrial rotating equipment.
The transmitter combines vibration measurement and signal conversion functions into one compact device. This integrated design reduces installation complexity and provides a convenient solution for permanent machine monitoring.
The standard 4–20 mA analog output allows direct integration with industrial control systems and monitoring platforms.
The vibration signal can be used for:
- Machine condition monitoring
- Equipment status evaluation
- Alarm management
- Vibration trend analysis
- Maintenance planning
- Fault diagnosis support
The transmitter housing is designed for industrial environments and provides protection against:
- Mechanical vibration
- Dust contamination
- Moisture
- Oil exposure
- Temperature variation
- Electrical interference
The internal electronics provide stable signal processing and consistent measurement performance during long-term operation.
The compact housing allows installation on various machine structures, including equipment where mounting space is limited.
The transmitter requires minimal maintenance and is suitable for continuous operation on critical rotating equipment.
Product Advantages
Continuous Condition Monitoring
The transmitter provides continuous vibration measurement while equipment is operating, allowing operators to understand machine health without stopping production.
Early Fault Detection
The device helps identify abnormal vibration trends before they develop into serious mechanical failures.
Possible detectable problems include:
- Bearing degradation
- Rotor imbalance
- Shaft misalignment
- Mechanical looseness
- Coupling damage
- Excessive vibration
- Structural vibration problems
Reliable Industrial Performance
The rugged construction provides stable operation in harsh industrial environments with vibration, dust, humidity, temperature changes, and electrical interference.
Easy System Integration
The standard 4–20 mA output allows simple connection with industrial automation systems and monitoring equipment.
Compact Installation Structure
The small size allows installation in areas where larger monitoring devices may not be suitable.
Reduced Maintenance Requirements
Continuous monitoring reduces unnecessary manual inspections and improves maintenance efficiency.
Improved Predictive Maintenance
The transmitter provides continuous vibration information, helping maintenance teams make decisions based on actual machine conditions.
Increased Equipment Reliability
Early detection of mechanical problems helps prevent severe damage and extends machinery service life.
Product Applications
The 991-25-50-01-00 is suitable for many 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:
- Large industrial motors
- Drive motors
- Fan motors
- Pump motors
- Auxiliary motors
Compressor Monitoring
Used for:
- Air compressors
- Gas compressors
- Refrigeration compressors
- Industrial process compressors
Turbine Monitoring
Applicable to:
- Steam turbine auxiliary equipment
- Gas turbine systems
- Rotating power machinery
General Industrial Equipment Monitoring
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) |
|---|---|---|---|---|---|---|
| 991-06-50-01-00 | 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 |
| 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 |
| 991-06-XX-01-05 | Industrial Vibration Transmitter | 4–20 mA | 24 VDC | 10 Hz–1000 Hz | Approx. 112 × 38 mm | Approx. 0.45 kg |
| 991-25-50-01-05 | 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 991-25-50-01-00 is a compact and reliable industrial vibration transmitter designed for permanent installation on rotating machinery requiring continuous condition monitoring.
As a member 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 simple and efficient solution for industrial machinery monitoring.
The transmitter delivers stable measurement performance, compact dimensions, strong environmental resistance, and easy integration with industrial monitoring systems.
By continuously monitoring vibration behavior, the device helps identify early mechanical problems such as imbalance, bearing deterioration, shaft misalignment, looseness, and abnormal operating conditions.
The 991-25-50-01-00 supports predictive maintenance strategies by improving fault detection, reducing unexpected downtime, optimizing maintenance planning, protecting critical equipment, and extending machinery service life.
It is suitable for applications in power generation, petrochemical processing, oil and gas facilities, manufacturing plants, mining operations, water treatment systems, marine equipment, and other industrial environments requiring dependable rotating machinery monitoring.