Introduction

The Bently Nevada 330881-28-00-145-00-02 PROXPAC XL Proximity Sensor is a self-contained eddy current proximity transducer assembly designed for industrial machinery protection and condition monitoring systems. It integrates the 3300 XL 8 mm probe and Proximitor electronics into a single rugged PPS housing, eliminating the need for external signal conditioning or separate Proximitor mounting hardware.

This architecture improves installation efficiency and ensures stable long-term measurement performance in demanding industrial environments where continuous vibration monitoring is critical for asset reliability and operational safety.

Technical Specifications

Parameter	Specification
Model	330881-28-00-145-00-02
Series	PROXPAC XL
Measurement Type	Eddy current proximity sensing
Probe Type	3300 XL 8 mm
Probe & Approvals Option	28 (multiple approvals)
Standoff Adapter Option	00 (no standoff)
Probe Penetration Option	145 mm
Fittings Option	00 (no fittings; plugs included)
Mounting Thread Option	02 (3/4-14 NPT)
Housing Material	PPS composite with conductive fibers
Output Signal	Analog displacement output
Dimensions	91.4 × 144.8 mm
Weight	1.44 kg (3.17 lb)

Applications

The PROXPAC XL proximity sensor is designed for continuous monitoring of rotating machinery where high-accuracy vibration and shaft displacement measurement are required for reliable operation and predictive maintenance.

Gas turbine rotor vibration monitoring
Steam turbine axial and radial displacement tracking
Industrial compressor stability and performance monitoring
Pump cavitation and imbalance detection
Generator rotor condition monitoring
Oil & gas rotating equipment protection systems
Refinery and petrochemical predictive maintenance applications

Advantages

Integrated probe + Proximitor architecture eliminates external signal conditioning modules
Stable signal output in electrically noisy industrial environments
Rugged PPS composite housing for long-term industrial durability
Designed for continuous 24/7 machinery monitoring applications
Reduced installation time and wiring complexity
High reliability in oil, gas, and power generation environments
Supports predictive maintenance and early fault detection strategies

Technical FAQs

Q1: What sensing technology does this model use?
It uses eddy current non-contact displacement measurement technology.

Q2: Is the Proximitor electronics integrated?
Yes, the PROXPAC XL integrates the 3300 XL Proximitor electronics inside the housing.

Q3: What parameters does it measure?
It measures shaft vibration and radial/axial displacement.

Q4: What machinery is it used on?
It is used on turbines, compressors, pumps, and generators.

Q5: Does it require external signal conditioning?
No, it is a fully self-contained monitoring system.

Q6: How does it perform in harsh environments?
It is rated for severe industrial environments, including high EMI and vibration conditions.

Q7: Can it operate continuously?
Yes, it is designed for 24/7 industrial monitoring.

Q8: What makes the housing special?
The PPS composite housing with conductive fibers improves durability and static dissipation.

Q9: What is the benefit of integration?
It removes external Proximitor housings and reduces installation complexity.

Q10: Why is it widely used in critical machinery?
Because it delivers stable, long-term vibration data for protection and predictive maintenance systems.

Look forward to your comments!Comment