Product Overview

The Bently Nevada 330105-02-12-05-00-05 is a 3300 XL 8 mm eddy-current proximity probe designed in a reverse mount configuration for shaft vibration and radial displacement monitoring in rotating machinery.

It is part of 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 allows installation where space constraints or mechanical layout require the probe to be installed in an inverted or back-facing orientation.

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
• Provides continuous real-time monitoring of rotating machinery
• Detects early mechanical issues such as:
  • Imbalance
  • Misalignment
  • Bearing wear
  • Shaft instability
• Supports machine protection and automatic 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 system used for:

• Vibration monitoring
• Shaft position measurement
• Machinery protection inputs

Installation Guidelines

• Designed for reverse mounting orientation
• Installed close to rotating shaft surface
• Requires precise air-gap calibration
• Short routing (0.5 m) reduces signal loss risk
• Proper shielding and grounding required
• Must be calibrated with matched system components

⚠️ Incorrect orientation or improper mounting can significantly 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 shaft vibration measurement
• Stable eddy-current sensing performance
• Compatible with API 670 monitoring systems
• Reliable operation in compact spaces
• Supports predictive maintenance strategies

Technical FAQs

Q1: What is a reverse mount probe?
A probe designed to be installed in an inverted or back-facing orientation where standard mounting is not possible.

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 commonly used?
In turbines, compressors, pumps, and other industrial rotating machinery with space constraints.

Conclusion

The Bently Nevada 330105-02-12-05-00-05 3300 XL 8 mm Reverse Mount Proximity Probe is a compact and flexible eddy-current sensor designed for constrained installation environments. It provides accurate vibration and displacement measurement while supporting machine protection and predictive maintenance in critical industrial systems.