Introduction

The 991-01-XX-01-05 (284318-01) is a loop-powered thrust sensor designed for axial displacement monitoring in industrial rotating machinery. It converts proximity probe signals into a stable 4–20 mA output for integration into control and protection systems.

Compared with radial vibration transmitters, the 991 series focuses specifically on thrust behavior, making it essential for compressors and turbines where axial position stability is critical to machine safety and performance.

The 991-01-XX-01-05 variant is widely used in OEM industrial configurations requiring standardized monitoring performance and reliable long-term operation in harsh environments.

Technical Specifications

Parameter	Value
Model	991-01-XX-01-05
Part Number	284318-01
Product Type	Thrust Sensor / Transmitter
Output Signal	4–20 mA
Power Supply	12–35 VDC (loop powered)
Input Type	Bently Nevada proximity probe system
Operating Temperature	-40°C to +85°C
Measurement Type	Axial displacement / thrust monitoring
Accuracy	±0.5% to ±1% full scale (application dependent)
Response Time	<1 second
Mounting Type	DIN rail / panel mount
Dimensions	100.1 × 73.9 × 53.3 mm
Weight	0.43 kg (0.95 lb)

Recommended Related Models

Bently Nevada 991-01-XX-01-00 284318-01
Bently Nevada 991-01-XX-01-CN 284318-01
Bently Nevada 990-10-XX-01-00 283278-01
Bently Nevada 990-10-XX-01-05 165353-01
Bently Nevada 3300 NSv Proximity Probe System

Popular Related Models

991-01-XX-01-00
991-01-XX-01-05
991-01-XX-01-CN
990-10-XX-01-05
990-08-XX-01-05

Applications

The Bently Nevada 991-01-XX-01-05 284318-01 991 Thrust Sensor Module is designed for high-accuracy axial displacement and thrust monitoring in rotating machinery, providing stable signal conversion for protection and condition monitoring systems.

Typical applications include:

Steam turbine thrust position monitoring
Gas turbine axial displacement tracking
Centrifugal compressor thrust bearing protection
Industrial pump axial movement supervision
Gearbox thrust load monitoring
Industrial fan rotor stability control
Critical rotating machinery protection systems
OEM predictive maintenance monitoring systems

Advantages

Dedicated axial thrust measurement for critical machinery protection
Integrated signal conditioning for simplified system architecture
Stable 4–20 mA output for PLC/DCS integration
High resistance to vibration, temperature, and industrial environments
Compatible with Bently Nevada 3300 NSv proximity probe systems
Compact OEM design suitable for control cabinet integration
Built-in NOT OK diagnostic function for fault detection
Long-term stability for continuous industrial monitoring

Technical FAQs

Q1: What is the main function of this device?
A1: It measures axial thrust/displacement in rotating machinery and converts it into a 4–20 mA output signal.

Q2: Is it loop-powered?
A2: Yes, it operates as a 2-wire loop-powered transmitter.

Q3: What output signal does it provide?
A3: A standard 4–20 mA analog signal proportional to thrust position.

Q4: What probe system is it compatible with?
A4: It is compatible with Bently Nevada 3300 NSv proximity probe systems.

Q5: Can it be used in turbines and compressors?
A5: Yes, it is widely used in turbines, compressors, pumps, and rotating machinery.

Q6: Does it support continuous operation?
A6: Yes, it is designed for 24/7 industrial monitoring.

Q7: Does it include diagnostics?
A7: Yes, it includes NOT OK signal and self-diagnostic functionality.

Q8: Is it suitable for harsh environments?
A8: Yes, it is built for high vibration, temperature, and humidity conditions.

Q9: Does it require external signal conditioning?
A9: No, signal conditioning is fully integrated inside the unit.

Q10: Can it connect directly to PLC/DCS systems?
A10: Yes, it integrates directly via 4–20 mA input channels.

Look forward to your comments!Comment

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Bently Nevada 991-01-XX-01-05 284318-01 991 Thrust Sensor