Flexible Thrust Monitoring Solution for Industrial Rotating Equipment
The Bently Nevada 991-01-XX-01-00 991 Thrust Sensor is a compact, loop-powered axial displacement transmitter engineered for continuous thrust position monitoring in rotating machinery. Designed for OEM equipment manufacturers and industrial maintenance applications, the 991 Series converts signals from a compatible 3300 NSv proximity probe and extension cable into a linear 4–20 mA output, making it easy to integrate with PLC, DCS, SCADA, and machinery protection systems. The transmitter is an ideal choice for compressors, pumps, motors, fans, and other critical assets where accurate shaft axial position monitoring is essential for maximizing equipment reliability.
The 991-01-XX-01-00 configuration features a factory-configurable measurement range (XX), 35 mm DIN-rail mounting, integrated Proximitor® signal conditioning, and the 00 standard approval option. Its compact, potted construction provides dependable operation in high-humidity industrial environments while simplifying installation by eliminating the need for an external Proximitor module.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-01-XX-01-00 |
| 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 |
| Wiring Configuration | Two-wire loop powered |
| Mounting Method | 35 mm DIN-rail mounting |
| Signal Conditioning | Integrated Proximitor® electronics |
| Diagnostic Outputs | PROX OUT and COM |
| Operating Temperature | -35°C to +85°C |
| Humidity Rating | Up to 100% condensing (non-submerged) |
| Construction | Fully potted industrial electronics |
| Dimensions | Approx. 82 × 35 × 75 mm |
| Weight | Approx. 0.43 kg |
Industrial Applications
The 991-01-XX-01-00 is designed for reliable shaft thrust monitoring across a broad range of industrial rotating equipment.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Centrifugal compressors, process pumps |
| Petrochemical | Process compressors and rotating machinery |
| Power Generation | Steam and gas turbine auxiliaries |
| Manufacturing | Industrial motors, blowers and fans |
| Water & Utilities | High-capacity pumping systems |
| OEM Machinery | Compressor and pump skids |
Typical applications include:
-
Continuous shaft axial position monitoring
-
Thrust bearing protection
-
Machinery condition monitoring
-
Predictive maintenance programs
-
PLC/DCS process feedback
-
Equipment alarm and shutdown systems
Key Benefits
Integrated Proximitor® Technology
The 991 Series integrates the Proximitor® signal conditioning electronics directly into the transmitter housing, eliminating the need for an external module and reducing wiring, installation time, and cabinet space requirements.
Configurable Measurement Range
The XX ordering option allows the transmitter to be configured for different thrust measurement ranges, enabling the same product family to support a variety of machinery designs and monitoring requirements.
Simple DIN-Rail Installation
The 01 mounting option supports standard 35 mm DIN-rail installation, providing quick panel integration for OEM equipment and industrial control cabinets.
Reliable 4–20 mA Output
The transmitter produces a stable industry-standard 4–20 mA signal, ensuring compatibility with virtually all modern automation and machinery protection systems.
Rugged Industrial Construction
Its fully potted design offers excellent resistance to humidity, vibration, and harsh industrial operating conditions, supporting dependable long-term performance.
Convenient Diagnostic Access
Dedicated PROX OUT and COM terminals provide direct access to dynamic vibration and gap voltage signals, simplifying commissioning, troubleshooting, and routine maintenance.
Technical FAQs
1. What is the Bently Nevada 991-01-XX-01-00 used for?
It continuously monitors shaft axial displacement and converts the measurement into a 4–20 mA output for machinery monitoring and protection systems.
2. What does the "XX" option represent?
The XX code indicates the factory-configured measurement range selected when the transmitter is ordered.
3. Which proximity probe is compatible?
The transmitter is designed for use with the Bently Nevada 3300 NSv proximity probe and its matching extension cable.
4. Does this model require an external Proximitor module?
No. The Proximitor® electronics are integrated into the transmitter enclosure.
5. What mounting method does this model use?
The 01 configuration is designed for installation on a standard 35 mm DIN rail.
6. What does the final "00" option indicate?
The 00 suffix specifies the standard ordering configuration without optional hazardous-area approval selections.
7. What power supply is required?
The transmitter operates from a 12–35 VDC loop-powered supply.
8. Are diagnostic outputs available?
Yes. PROX OUT and COM terminals provide access to vibration and gap voltage signals for testing and diagnostics.
9. Which industries commonly use the 991 Series?
The transmitter is widely used in oil & gas, petrochemical, power generation, manufacturing, water treatment, and OEM rotating machinery applications.
10. What are the main advantages of the 991 Series?
The 991 Series offers integrated signal conditioning, compact installation, configurable measurement ranges, dependable 4–20 mA output, and reliable long-term machinery protection.
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