High-Accuracy Axial Position Monitoring for Industrial Rotating Assets
The Bently Nevada 991-06-50-01-05 991 Thrust Transmitter is a compact and dependable axial displacement monitoring solution designed for continuous thrust position measurement on rotating machinery. Developed for OEM equipment builders and industrial operators, the transmitter converts shaft axial movement detected by a compatible Bently Nevada 3300 NSv proximity probe into a proportional 4–20 mA output signal for direct connection to PLC, DCS, SCADA, and machinery protection systems.
Designed for applications including centrifugal compressors, small pumps, motors, fans, and auxiliary turbines, the 991 Series combines sensing, signal conditioning, and transmission functions into one integrated device. The 991-06-50-01-05 configuration provides a 0.6 mm full-scale measurement range, 5.0 m system length, 35 mm DIN-rail mounting, and hazardous-area approval capability, making it a practical choice for demanding industrial environments.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-06-50-01-05 |
| Product Type | 991 Thrust Transmitter |
| Measurement Function | Shaft axial displacement / thrust position |
| Full Scale Range | 0.6-0-0.6 mm |
| System Length | 5.0 m (16.4 ft) |
| Compatible Probe | Bently Nevada 3300 NSv Proximity Probe |
| Output Signal | 4–20 mA proportional analog output |
| Power Supply | 12–35 VDC |
| Circuit Type | Two-wire loop powered |
| Mounting Method | 35 mm DIN-rail clips |
| Signal Conditioning | Integrated Proximitor® Sensor |
| Diagnostic Output | PROX OUT and COM |
| Approval Option | CSA Division 2 / hazardous-area configuration |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -52°C to +177°C |
| Relative Humidity | Up to 100% condensing, non-submerged |
| Transmitter Dimensions | Approx. 73 × 50 × 100 mm |
| Transmitter Weight | Approx. 0.43 kg |
| Total System Weight | Approx. 0.82 kg |
Industrial Applications
The 991-06-50-01-05 Thrust Transmitter is designed for machinery where accurate shaft axial position feedback is essential for safe and efficient operation.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Petrochemical | Refinery rotating machinery |
| Power Generation | Auxiliary turbines and rotating equipment |
| Manufacturing | Motors, blowers, industrial fans |
| Water Treatment | Large pumping systems |
| OEM Machinery | Compressor and pump packages |
Typical applications include:
-
Continuous thrust position monitoring
-
Thrust bearing protection
-
Machinery condition monitoring
-
Predictive maintenance systems
-
Machine alarm and shutdown logic
- Control system feedback applications
-
Product Advantages
Integrated Proximitor® Sensor Design
The built-in Proximitor® electronics eliminate the need for a separate signal conditioner, reducing panel space requirements and simplifying system installation. This integrated architecture improves reliability while reducing wiring complexity.
Accurate 0.6 mm Measurement Range
The 06 measurement option provides a precise 0.6-0-0.6 mm axial displacement range, making the transmitter suitable for applications requiring reliable monitoring of small shaft thrust movements.
Flexible 5 Meter System Configuration
The 50 option provides a 5.0 meter probe and extension cable system length, allowing flexible installation on compact machinery packages and OEM equipment designs.
Hazardous-Area Compatibility
The 05 approval option supports installations requiring certified hazardous-area operation, helping expand application flexibility in industrial environments where safety compliance is essential.
Standard 4–20 mA Industrial Output
The transmitter provides a universal analog output signal compatible with common industrial automation platforms, allowing easy integration into existing machinery monitoring systems.
Compact DIN-Rail Installation
The 35 mm DIN-rail mounting design enables fast installation inside control cabinets while minimizing space requirements for OEM and retrofit applications.
Built for Continuous Machinery Monitoring
The 991 Series is engineered for long-term operation on rotating equipment where stable thrust position measurement helps prevent mechanical damage and unexpected downtime.
Technical FAQs
1. What is the Bently Nevada 991-06-50-01-05 used for?
It is used for continuous monitoring of shaft axial displacement and thrust position in rotating machinery applications.
2. What measurement range does this transmitter provide?
The model provides a 0.6-0-0.6 mm full-scale thrust measurement range.
3. Which probe is compatible with the 991-06-50-01-05?
It is designed to operate with the Bently Nevada 3300 NSv proximity probe and matching extension cable system.
4. What does the “50” option indicate?
The 50 designation identifies the 5.0 meter system length configuration.
5. What does the “01” mounting option mean?
The 01 option specifies installation using 35 mm DIN-rail clips.
6. Does this transmitter require an external Proximitor module?
No. The Proximitor® sensor electronics are integrated into the transmitter housing.
7. What output signal does the transmitter provide?
It provides a standard 4–20 mA proportional output representing shaft axial position.
8. What power supply is required?
The transmitter requires a 12–35 VDC loop-powered supply.
9. Are diagnostic signals available?
Yes. The unit provides PROX OUT and COM terminals for diagnostic testing and commissioning.
10. What machines commonly use the 991 Series?
Typical applications include centrifugal compressors, pumps, motors, fans, and other rotating machinery requiring thrust monitoring.
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