Reliable Axial Position Measurement for Industrial Machinery
The Bently Nevada 991-01-XX-01-CN 284318-01 Thrust Transmitter is a compact, loop-powered transmitter engineered for continuous shaft axial displacement (thrust) monitoring in critical rotating equipment. As part of the proven 991 Thrust Transmitter family, it works with the 3300 NSv proximity probe system to convert axial position measurements into a precise 4–20 mA analog output, enabling seamless integration with PLC, DCS, SCADA, and machinery protection systems. It is widely used on centrifugal compressors, pumps, motors, and fans where dependable thrust monitoring is essential for improving equipment availability and reducing maintenance costs.
The 991-01-XX-01-CN configuration features a factory-configurable measurement range (XX), 35 mm DIN-rail mounting, and the CN regional configuration. The associated Part Number 284318-01 identifies the hardware version of this transmitter. Integrated Proximitor® electronics eliminate the need for a separate signal conditioner, reducing installation complexity while maintaining excellent measurement stability.
Technical Profile
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-01-XX-01-CN |
| Part Number | 284318-01 |
| Product Type | 991 Thrust Transmitter |
| Measurement | 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 output |
| Power Supply | 12–35 VDC |
| Wiring | Two-wire loop powered |
| Mounting | 35 mm DIN-rail |
| Signal Conditioning | Integrated Proximitor® electronics |
| Diagnostic Output | PROX OUT and COM |
| Regional Option | CN configuration |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -51°C to +100°C (typical) |
| Dimensions | Approx. 73 × 50 × 100 mm |
| Weight | Approx. 0.45 kg |
Typical Applications
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Petrochemical | Rotating process equipment |
| Power Generation | Steam turbines and auxiliary systems |
| Manufacturing | Industrial motors, fans, blowers |
| Mining & Metals | Heavy rotating machinery |
| OEM Equipment | Compressor and pump packages |
Typical monitoring functions include:
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Shaft axial displacement monitoring
-
Thrust bearing protection
-
Continuous machinery condition monitoring
-
Predictive maintenance programs
-
PLC/DCS process integration
-
Alarm and shutdown protection
Product Advantages
Integrated Proximitor® Electronics
The transmitter includes built-in signal conditioning, eliminating the need for an external Proximitor module and reducing installation costs and wiring complexity.
Flexible Measurement Configuration
The configurable XX measurement option allows the transmitter to be matched to different thrust monitoring requirements, making it suitable for both OEM installations and retrofit projects.
Compact DIN-Rail Installation
The 01 mounting option supports standard 35 mm DIN-rail installation for quick integration into industrial control cabinets while minimizing occupied panel space.
Stable 4–20 mA Output
The industry-standard analog output ensures reliable compatibility with virtually all PLC, DCS, and machinery protection systems, providing accurate real-time shaft position feedback.
Rugged Industrial Construction
Designed specifically for continuous-duty rotating machinery, the 991 Series delivers dependable performance under demanding industrial operating conditions, including high vibration and wide temperature variations.
Easy Diagnostics and Maintenance
Dedicated PROX OUT and COM terminals allow technicians to access gap voltage and dynamic signals, simplifying commissioning, troubleshooting, and preventive maintenance.
Technical FAQs
1. What is the 991-01-XX-01-CN used for?
It continuously measures shaft axial displacement and converts the signal into a 4–20 mA output for machinery protection and process monitoring.
2. What does the "XX" designation represent?
It identifies the factory-configured measurement range selected for the specific application.
3. What is Part Number 284318-01?
284318-01 is the associated Bently Nevada hardware part number for this transmitter configuration.
4. What does the "CN" suffix indicate?
The CN suffix denotes a regional ordering configuration. Specific regional certifications and documentation should be verified against the complete product ordering code.
5. Which probe system is compatible?
The transmitter is designed for use with the Bently Nevada 3300 NSv proximity probe and matching extension cable.
6. Does the transmitter require an external Proximitor?
No. Integrated Proximitor® electronics are built directly into the transmitter enclosure.
7. What power supply is required?
The unit operates from a 12–35 VDC two-wire loop-powered supply.
8. Are diagnostic outputs available?
Yes. PROX OUT and COM terminals provide access to gap voltage and dynamic signals for commissioning and diagnostics.
9. Which industries commonly use this model?
It is widely installed in oil & gas, petrochemical, power generation, manufacturing, mining, and OEM rotating equipment applications.
10. What are the main advantages of the 991 Series?
The 991 Series combines integrated signal conditioning, flexible measurement options, compact installation, dependable 4–20 mA output, and proven long-term reliability for rotating machinery protection.
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