Advanced Thrust Position Monitoring for High-Value Rotating Equipment
The Bently Nevada 991-01-XX-01-CN 288865-01 991 Thrust Sensor is a compact axial displacement monitoring device designed for continuous measurement of shaft thrust position in industrial rotating machinery. As part of the proven 991 Thrust Transmitter family, this sensor provides a reliable interface between a 3300 NSv proximity probe system and plant control platforms by converting axial movement into a standard 4–20 mA proportional signal. It is widely applied in compressors, pumps, motors, fans, and other critical rotating assets where accurate thrust monitoring is required to protect bearings and improve machine availability.
The 991-01-XX-01-CN configuration with Part Number 288865-01 features a configurable measurement range, compact DIN-rail installation, integrated signal conditioning electronics, and a CN regional configuration option. The integrated Proximitor® electronics simplify system architecture by eliminating the need for an external signal conditioner, helping reduce installation time and maintenance requirements.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-01-XX-01-CN |
| Part Number | 288865-01 |
| Product Type | 991 Thrust Sensor / Thrust Transmitter |
| Measurement Function | Shaft axial displacement / thrust position |
| Measurement Range | Factory configurable (XX option) |
| Compatible Probe | Bently Nevada 3300 NSv Proximity Probe |
| Output Signal | 4–20 mA proportional analog output |
| Power Supply | 12–35 VDC loop powered |
| Wiring Configuration | Two-wire system |
| Mounting Type | 35 mm DIN-rail mounting |
| Signal Conditioning | Integrated Proximitor® electronics |
| Diagnostic Connection | PROX OUT and COM |
| Regional Configuration | CN |
| Operating Temperature | -35°C to +85°C |
| Humidity Rating | Up to 100% condensing (non-submerged) |
| Dimensions | Approx. 73 × 50 × 100 mm |
| Weight | Approx. 0.43 kg |
Industrial Applications
The 991-01-XX-01-CN 288865-01 provides dependable thrust monitoring for equipment where axial shaft movement must be continuously observed.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Petrochemical | Refinery rotating machinery |
| Power Generation | Turbine auxiliary systems |
| Manufacturing | Motors, blowers, industrial fans |
| Water & Utilities | Large pumping systems |
| OEM Machinery | Compressor and pump packages |
Common monitoring applications include:
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Axial shaft position measurement
-
Thrust bearing protection
-
Rotating machinery condition monitoring
-
Predictive maintenance systems
-
Control system feedback
-
Alarm and shutdown protection
Product Advantages
Integrated Proximitor® Technology
The built-in Proximitor® electronics provide signal conditioning directly within the transmitter housing. This design reduces external hardware requirements, simplifies panel layouts, and improves overall system reliability.
Flexible Measurement Configuration
The XX option allows the transmitter to be configured for different thrust measurement requirements, making the 991 Series suitable for a wide range of rotating equipment designs and retrofit applications.
Compact DIN-Rail Installation
The 01 mounting configuration supports standard DIN-rail installation, allowing quick integration into OEM control cabinets and machinery monitoring panels.
Reliable 4–20 mA Output
The industry-standard 4–20 mA signal provides compatibility with PLC, DCS, SCADA, and machinery protection systems without additional signal conversion equipment.
Designed for Continuous Machinery Protection
The 991 Series is optimized for OEM centrifugal compressors, pumps, motors, and fans requiring simple and reliable axial displacement monitoring.
Simplified Maintenance and Diagnostics
Diagnostic terminals provide convenient access for commissioning and troubleshooting, helping technicians verify probe operation and system performance efficiently.
Technical FAQs
1. What is the Bently Nevada 991-01-XX-01-CN 288865-01 used for?
It is used for continuous monitoring of shaft axial displacement and thrust position in rotating machinery.
2. What does the "XX" in the model number indicate?
The XX designation represents the factory-selected measurement range configuration.
3. What is Part Number 288865-01?
288865-01 identifies the specific hardware configuration associated with this 991 Thrust Sensor model.
4. Which probe system works with this transmitter?
The unit is designed for use with the Bently Nevada 3300 NSv proximity probe system.
5. Does this model require an external Proximitor module?
No. The Proximitor® signal conditioning electronics are integrated into the transmitter assembly.
6. What output signal does the sensor provide?
The transmitter provides a proportional 4–20 mA analog output suitable for industrial monitoring systems.
7. What type of mounting does the 991-01-XX-01-CN use?
It uses a 35 mm DIN-rail mounting configuration for convenient installation.
8. What does the CN suffix mean?
The CN suffix identifies a regional configuration option. The exact certification details depend on the complete ordering code.
9. What power supply is required?
The transmitter operates from a 12–35 VDC loop-powered supply.
10. Why choose the Bently Nevada 991 Series?
The 991 Series offers compact installation, integrated signal conditioning, reliable 4–20 mA output, and proven performance for thrust monitoring applications in rotating machinery.
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