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Product Overview
The Bently Nevada 991-01-XX-01-05 991 Thrust Sensor is a loop-powered, two-wire transmitter specifically designed for thrust position monitoring in rotating machinery. It provides a 4–20 mA output proportional to the measured shaft position, allowing easy integration into control and protection systems without the need for complex rack-based monitoring.
Key Features
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2-wire, loop-powered thrust sensor transmitter
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Provides 4–20 mA output proportional to shaft thrust position
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Compatible with Bently Nevada proximity probes and extension cables
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PROX OUT terminal for vibration and gap voltage signal access
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Zero and span potentiometers for field calibration
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Fault detection and “Not OK” status indication
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DIN rail or bulkhead mounting options
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Rugged design for industrial applications
Technical Specifications
| Item | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Part Number | 991-01-XX-01-05 |
| Series | 991 Thrust Sensor |
| Product Type | Thrust position transmitter |
| Dimensions | 100.1 x 73.9 x 53.3 mm |
| Weight | 0.43 kg |
| Power Supply | +12 to +35 V DC |
| Output | 4–20 mA proportional to thrust position |
| Measurement Range | 0–2 mm or per probe configuration |
| Frequency Response | DC to 600 Hz |
| Loop Accuracy | ±1.5% of full scale |
| Max Loop Resistance | 1,000 Ω at 35 V DC |
| Probe Compatibility | Bently Nevada proximity probes and extension cables |
| Operating Temperature – Transmitter | –35 °C to +85 °C |
| Operating Temperature – Probe | –52 °C to +177 °C |
| Relative Humidity | 0–100%, condensing |
| Mounting Options | DIN rail or bulkhead mounting |
Industry Applications
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Steam turbines and gas turbines
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Compressors and pumps
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Electric motors and generators
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Thrust position monitoring in critical machinery
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Oil & gas and petrochemical plants
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Power generation and industrial utilities
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OEM machinery protection systems
Frequently Asked Questions (FAQ)
Q1: What is the main function of the 991 Thrust Sensor?
It measures thrust position and provides a 4–20 mA output proportional to shaft displacement.
Q2: Is this device compatible with Bently Nevada proximity probes?
Yes, it works with Bently Nevada proximity probes and extension cables.
Q3: How is the 991-01-XX-01-05 powered?
It is loop-powered with a supply of +12 to +35 V DC.
Q4: Does it include diagnostics?
Yes, it provides “Not OK” indication and probe fault detection.
Q5: Can it output both vibration and position signals?
Yes, it features a PROX OUT connection for vibration and gap signals.
Q6: What mounting options are available?
It supports DIN rail and bulkhead mounting.
Q7: What industries commonly use this thrust sensor?
It is widely used in oil & gas, petrochemical, and power generation industries.
Q8: Can it replace a rack-based monitoring system?
Yes, it offers a cost-effective solution where full rack-based monitoring is not required.
Related Bently Nevada Modules
| Model | Description |
|---|---|
| 991-02-XX-01-05 | Thrust sensor, alternative configuration |
| 991-03-XX-01-05 | Thrust sensor, extended measurement range |
| 990-05-XX-01-00 | Standard 990 series vibration transmitter |
| 991-04-XX-01-05 | Thrust sensor for OEM applications |
| 3300 NSv Probe | Compatible proximity probe |
| 330930 Extension Cable | Proximity probe extension cable |
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