Engineered for Accurate Axial Position Measurement in Industrial Machinery
The Bently Nevada 991-01-90-02-00 991 Thrust Sensor is a compact, loop-powered axial displacement transmitter designed to provide continuous monitoring of shaft thrust position in rotating equipment. As a member of the proven 991 Thrust Transmitter family, it converts signals from a compatible 3300 NSv proximity probe system into a precise 4–20 mA analog output, enabling seamless integration with PLC, DCS, SCADA, and machinery protection systems. The transmitter is ideal for compressors, pumps, motors, and fans where reliable axial position monitoring is critical for maintaining operational safety and equipment performance.
The 991-01-90-02-00 configuration features a 0.6–0–0.6 mm thrust measurement range, a 9-meter transducer system, bulkhead mounting, and the 00 standard approval option. Its integrated Proximitor® electronics eliminate the need for an external signal conditioner, simplifying installation while delivering dependable long-term performance.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 991-01-90-02-00 |
| Product Type | 991 Thrust Sensor / Thrust Transmitter |
| Measurement Function | Shaft axial displacement (thrust position) |
| Measurement Range | 0.6–0–0.6 mm |
| Compatible Probe | Bently Nevada 3300 NSv Proximity Probe |
| System Length | 9.0 m |
| Output Signal | 4–20 mA proportional analog output |
| Power Supply | 12–35 VDC |
| Wiring Configuration | Two-wire loop powered |
| Mounting Method | Bulkhead mounting |
| Signal Conditioning | Integrated Proximitor® electronics |
| Diagnostic Outputs | PROX OUT and COM |
| Operating Temperature | -35°C to +85°C |
| Storage Temperature | -51°C to +177°C |
| Humidity | Up to 100% condensing (non-submerged) |
| Dimensions | Approx. 82 × 35 × 75 mm |
| Weight | Approx. 0.43 kg |
Typical Applications
The 991-01-90-02-00 is suitable for industrial machinery requiring continuous axial displacement measurement and dependable thrust protection.
| Industry | Typical Equipment |
|---|
| Oil & Gas | Process compressors, centrifugal pumps |
| Petrochemical | Rotating process equipment |
| Power Generation | Steam turbine auxiliary machinery |
| Manufacturing | Industrial motors and fans |
| Water Treatment | High-capacity pumping stations |
| OEM Equipment | Compressor and pump packages |
Typical monitoring functions include:
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Shaft thrust position monitoring
-
Axial displacement measurement
-
Thrust bearing protection
-
Machine condition monitoring
-
PLC and DCS feedback
-
Predictive maintenance programs
Product Highlights
Integrated Proximitor® Electronics
The transmitter incorporates signal conditioning electronics within the enclosure, removing the need for an external Proximitor module. This reduces wiring complexity and speeds installation.
Extended 9-Meter Transducer System
The 90 configuration provides a 9-meter system length, offering additional installation flexibility for large machinery packages where longer cable runs are required.
Bulkhead Mounting Design
The 02 mounting option uses a secure bulkhead configuration, making the transmitter well suited for OEM skids, machinery frames, and industrial enclosures requiring robust mechanical installation.
Standard Industrial 4–20 mA Output
A stable 4–20 mA proportional signal allows straightforward integration with virtually all industrial automation and machinery protection systems.
Built for Continuous Industrial Service
Designed for harsh operating environments, the 991 Series provides reliable monitoring under demanding temperature, humidity, and vibration conditions.
Simplified Diagnostics
Dedicated PROX OUT and COM terminals provide access to gap voltage and dynamic signals for commissioning, troubleshooting, and routine maintenance.
Technical FAQs
1. What is the Bently Nevada 991-01-90-02-00 used for?
It continuously measures shaft axial displacement and outputs a proportional 4–20 mA signal for machinery monitoring and protection.
2. What measurement range does this model provide?
This model is configured with a 0.6–0–0.6 mm axial displacement range, suitable for precision thrust monitoring.
3. What does the "90" option represent?
The 90 designation specifies a 9-meter transducer system length.
4. What does the "02" mounting option indicate?
It specifies a bulkhead mounting configuration for secure mechanical installation.
5. What does the final "00" option mean?
The 00 suffix indicates the standard ordering configuration without optional agency approval selections.
6. Which probe system is compatible?
The transmitter is designed for use with the Bently Nevada 3300 NSv proximity probe and its matching extension cable.
7. Does the transmitter require an external Proximitor?
No. The Proximitor electronics are integrated into the transmitter housing.
8. What power supply is required?
The unit operates from a 12–35 VDC loop-powered supply.
9. What diagnostic connections are available?
The transmitter includes PROX OUT and COM terminals for signal verification and maintenance diagnostics.
10. Which machines commonly use the 991 Series?
Typical installations include centrifugal compressors, industrial pumps, motors, blowers, and fans requiring continuous thrust monitoring.
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