Introduction

The 991-06-50-01-CN is a loop-powered thrust transmitter used for axial displacement monitoring in rotating machinery. It converts proximity probe signals into a stable 4–20 mA output for integration into industrial automation and protection systems.

This model is widely used in turbines, compressors, pumps, and other rotating equipment where axial shaft position must be continuously monitored to ensure mechanical stability and prevent thrust-related failures.

The 991 series is specifically engineered for thrust monitoring rather than radial vibration, making it a critical component in compressor and turbine protection strategies where axial load control directly affects equipment reliability.

The -CN configuration is generally associated with region-specific certification and installation compliance requirements for industrial deployments.

Technical Specifications

Parameter	Value
Model	991-06-50-01-CN
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	Manufacturer system-dependent (typically ±1% FS)
Response Time	Application dependent
Mounting Type	DIN rail / panel mount
Dimensions	100.1 × 73.9 × 53.3 mm
Weight	0.43 kg (0.95 lb)

Recommended Related Models

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Bently Nevada 990-10-XX-01-05 165353-01

Popular Related Models

991-01-XX-01-00
991-01-XX-01-05
991-01-XX-01-CN
991-06-50-01-00
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Applications

The Bently Nevada 991-06-50-01-CN 991 Thrust Sensor Module is designed for axial displacement (thrust position) monitoring in rotating machinery, providing stable 4–20 mA signal output for industrial protection and condition monitoring systems.

Typical applications include:

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

Advantages

Dedicated axial thrust measurement for critical rotating equipment
Integrated signal conditioning simplifies system architecture
Stable 4–20 mA output for PLC/DCS integration
Loop-powered 2-wire design reduces wiring complexity
Compatible with Bently Nevada 3300 NSv proximity probe systems
Industrial-grade potted construction for harsh environments
Built-in NOT OK diagnostic function for fault detection
Designed for continuous 24/7 monitoring applications

Technical FAQs

Q1: What is the main function of this sensor?
A1: It measures axial displacement (thrust position) 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: It provides a standard 4–20 mA analog signal for control systems.

Q4: What type of machinery uses it?
A4: It is commonly used in turbines, compressors, pumps, motors, and fans.

Q5: Can it operate continuously?
A5: Yes, it is designed for continuous industrial monitoring.

Q6: Does it support fault diagnostics?
A6: Yes, it includes NOT OK signal and self-diagnostic functionality.

Q7: Is it suitable for harsh environments?
A7: Yes, it is designed for high humidity, vibration, and temperature conditions.

Q8: Does it require external signal conditioning?
A8: No, signal conditioning is fully integrated inside the unit.

Q9: Can it connect directly to PLC/DCS systems?
A9: Yes, it integrates directly via 4–20 mA input channels.

Q10: What does the “-CN” option indicate?
A10: It typically refers to regional certification/approval configuration for specific market compliance (such as China-specific regulatory variants).

Look forward to your comments!Comment