Product Overview

The Bently Nevada 330105-02-12-05-02-BR is a 3300 XL 8 mm eddy-current proximity probe in a reverse mount configuration, designed for shaft vibration and radial displacement monitoring in rotating machinery.

It belongs to the Bently Nevada 3300 XL proximity transducer system, widely used in turbines, compressors, pumps, and generators for continuous condition monitoring and machine protection.

The reverse mount design supports installation in constrained mechanical layouts where standard forward-facing probe mounting is not feasible.

Technical Specifications

Function and Working Principle

The probe operates using the eddy-current principle, where electromagnetic induction is used to measure the distance between the probe tip and a conductive rotating shaft.

Operating Principle

1. Probe generates a high-frequency electromagnetic field
2. Eddy currents are induced in the shaft surface
3. Distance variation modifies signal response
4. Output voltage represents displacement and vibration

$x\propto V$

Where displacement (x) is proportional to the output voltage (V).

Key Functions

• Measures shaft vibration and radial displacement
• Enables continuous machine health monitoring
• Detects early mechanical faults such as:
  • Imbalance
  • Misalignment
  • Bearing wear
  • Shaft instability
• Supports machine protection and shutdown systems

System Role

This probe is part of a complete 3300 XL proximity measurement chain:

• Proximity probe (sensor head)
• Extension cable
• Proximitor sensor (signal conditioning module)

Together, they form a calibrated monitoring system used for:

• Vibration analysis
• Shaft position tracking
• Protection system inputs

Installation Guidelines

• Designed for reverse mounting applications
• Suitable for compact or obstructed installation spaces
• Requires precise air-gap calibration
• 0.5 m system length minimizes signal loss
• Proper shielding and grounding required
• Must be calibrated with matched system components

⚠️ Incorrect installation or wrong orientation may affect measurement accuracy.

Compatible System Components

• Bently Nevada 3300 XL Proximitor sensors
• 3300 XL extension cables
• 3300 / 3500 monitoring systems
• Junction boxes and termination modules
• Industrial vibration monitoring systems

Recommended Alternative Models

Key Advantages

• Flexible reverse-mount installation design
• High-precision vibration measurement
• Stable eddy-current sensing performance
• Compatible with API 670 systems
• Reliable operation in compact spaces
• Supports predictive maintenance strategies

Technical FAQs

Q1: What does the “BR” suffix indicate?
It typically denotes a specific configuration or variant within the reverse mount family.

Q2: What does this probe measure?
It measures shaft vibration and radial displacement.

Q3: Is it a standalone device?
No, it must be used with a Proximitor sensor and extension cable system.

Q4: Where is it used?
In turbines, compressors, pumps, and other industrial rotating equipment with space constraints.

Conclusion

The Bently Nevada 330105-02-12-05-02-BR 3300 XL 8 mm Reverse Mount Probe is a compact eddy-current sensor designed for constrained installation environments. It delivers accurate vibration and displacement monitoring, supporting safe operation and predictive maintenance of critical rotating machinery in industrial systems.