Advanced Thrust Monitoring Designed for Industrial Reliability
The Bently Nevada 991-01-XX-01-05 284318-01 991 Thrust Transmitter is a high-performance axial displacement transmitter developed to provide continuous thrust position monitoring for critical rotating machinery. Designed for OEM equipment and industrial automation systems, it converts signals from a compatible 3300 NSv proximity probe system into a precise 4–20 mA analog output, allowing direct integration with PLC, DCS, SCADA, and machinery protection systems. Its compact construction, integrated signal conditioning, and proven reliability make it an excellent solution for compressors, pumps, motors, blowers, and other rotating assets requiring accurate axial displacement measurement.
The 991-01-XX-01-05 configuration incorporates a factory-configurable measurement range (XX), 35 mm DIN-rail mounting, and the 05 hazardous-area approval option, while Part Number 284318-01 identifies this hardware configuration. With integrated Proximitor® electronics, the transmitter eliminates the need for an external signal conditioner, reducing installation costs and simplifying maintenance throughout the equipment lifecycle.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-01-XX-01-05 |
| Part Number | 284318-01 |
| Product Type | 991 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 |
| Wiring Configuration | Two-wire loop powered |
| Mounting Method | 35 mm DIN-rail |
| Signal Conditioning | Integrated Proximitor® electronics |
| Diagnostic Outputs | PROX OUT and COM |
| Approval Option | 05 hazardous-area configuration |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -52°C to +177°C |
| Dimensions | Approx. 82 × 35 × 75 mm |
| Weight | Approx. 0.43 kg |
Typical Applications
The 991-01-XX-01-05 is designed for continuous machinery protection across numerous industrial sectors.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, pipeline pumps |
| Petrochemical | Process compressors and rotating machinery |
| Power Generation | Steam turbines, auxiliary equipment |
| Manufacturing | Electric motors, blowers, industrial fans |
| Water Treatment | High-capacity pumping stations |
| OEM Machinery | Compressor and pump packages |
Typical monitoring applications include:
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Shaft axial displacement monitoring
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Thrust bearing protection
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Continuous machine condition monitoring
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Predictive maintenance systems
-
PLC/DCS process integration
-
Performance Advantages
Integrated Proximitor® Electronics
Signal conditioning electronics are built directly into the transmitter enclosure, eliminating external Proximitor modules and reducing installation complexity while improving overall system reliability.
Configurable Measurement Range
The configurable XX option enables the transmitter to be matched to different thrust monitoring requirements, providing flexibility for both OEM equipment and retrofit applications.
Hazardous-Area Ready
The 05 configuration is intended for installations requiring hazardous-area approvals. Actual certifications depend on the complete ordered configuration and regional requirements.
Standard 4–20 mA Process Output
The industry-standard analog output provides dependable compatibility with virtually all industrial control, monitoring, and protection systems.
Compact DIN-Rail Installation
The 01 mounting option supports fast installation on standard 35 mm DIN rails, minimizing cabinet space while simplifying wiring and maintenance.
Built for Long-Term Industrial Service
Designed for continuous-duty machinery monitoring, the 991 Series withstands demanding industrial environments while delivering stable, repeatable measurement performance throughout its service life.
Technical FAQs
1. What is the 991-01-XX-01-05 284318-01 used for?
It continuously monitors shaft axial displacement and converts the measurement into a 4–20 mA analog signal for machinery monitoring and protection systems.
2. What does the "XX" designation indicate?
The XX code represents the factory-configured measurement range selected during product ordering.
3. What is Part Number 284318-01?
284318-01 identifies the specific hardware configuration associated with this transmitter model.
4. Which proximity probe is compatible?
The transmitter is designed to operate with the Bently Nevada 3300 NSv proximity probe and its matching extension cable system.
5. Does the transmitter require a separate Proximitor module?
No. Integrated Proximitor® electronics eliminate the need for external signal conditioning hardware.
6. What power supply is required?
The unit operates from a 12–35 VDC two-wire loop-powered supply.
7. What mounting method is used?
The 01 option specifies installation on a standard 35 mm DIN rail.
8. What does the "05" option represent?
The 05 suffix indicates a hazardous-area approval configuration. The exact approvals depend on the complete ordering code.
9. Are diagnostic outputs available?
Yes. PROX OUT and COM terminals allow access to dynamic vibration and gap voltage signals for commissioning and diagnostics.
10. Which industries commonly install the 991 Series?
The transmitter is widely used in oil & gas, petrochemical, power generation, manufacturing, water treatment, and OEM rotating equipment applications.
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