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Self-Contained PROXPAC XL Sensor for Shaft Vibration Monitoring
The Bently Nevada 330880-28-40-058-01-02 PROXPAC XL proximity transducer assembly integrates an 8 mm probe and Proximitor® sensor into a single rugged housing. This self-contained design eliminates the need for separate extension cables and external Proximitor enclosures. The assembly provides high-precision shaft vibration and radial position measurements for critical turbomachinery. It serves steam turbines, gas turbines, compressors, and large pumps in power generation and oil and gas facilities.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 330880-28-40-058-01-02 |
| Brand | Bently Nevada |
| Category | PROXPAC XL Proximity Transducer Assembly |
| Probe Type | 3300 XL 8 mm |
| Assembly Type | Integrated Probe + Proximitor® Sensor |
| Standoff Adapter (B Dimension) | 4.0 inches (40 units) |
| Probe Penetration (C Dimension) | 5.8 inches (058 units) |
| Fittings Option | One 3/4-14 NPT fitting and two plugs |
| Mounting Thread | 3/4-14 NPT |
| Housing Material | Polyphenylene Sulfide (PPS) thermoplastic |
| Probe Case Material | AISI 304 stainless steel |
| Probe Tip Material | Polyphenylene Sulfide (PPS) |
| Scale Factor | 7.87 V/mm (200 mV/mil) |
| Linear Range | 4.0 mm (160 mils) |
| Frequency Response | 0 to 10 kHz |
| Operating Temperature | -52°C to +177°C |
| Power Requirement | -17.5 to -26 VDC |
| Output Impedance | 50 Ω |
| Cable Type | 75 Ω coaxial, FEP insulated |
| Weight | 0.60 kg |
| Country of Origin | USA |
Integrated Design Advantages
This assembly combines the probe and Proximitor® sensor into one factory-matched unit. The integrated construction significantly reduces installation complexity and potential failure points . This design also eliminates the electrical mismatch risks associated with traditional extension cables. Consequently, the system delivers improved signal-to-noise ratios and measurement stability.
Rugged Construction for Harsh Environments
The molded PPS thermoplastic housing resists degradation from synthetic oils, fuels, and industrial solvents . This material replaces steel and aluminum in previous housing designs while effectively dissipating electrostatic charges . The housing carries a Type 4X and IP66 rating for severe environments . Therefore, the assembly withstands chemically aggressive conditions common in compressor decks and turbine casings.
Simplified Field Installation
Because the unit requires no separate housing for a Proximitor®, you can mount the assembly directly to the machine casing . This streamlined design reduces the number of parts to manage during installation and commissioning . The 3/4-14 NPT mounting thread provides a standard, secure interface for most machinery applications. Moreover, the assembly connects directly to 3300 series racks and 3500 series monitors without additional adapters .
Precision Measurement Capability
The eddy-current sensing technology delivers precise shaft vibration and position measurements under dynamic operating conditions . The scale factor of 7.87 V/mm ensures accurate displacement readings across the linear range. The frequency response from 0 to 10 kHz captures both slow shaft movements and high-speed vibrations . Consequently, operators can rely on this assembly for early detection of bearing wear, unbalance, and misalignment.
Predictive Maintenance Support
By delivering high-resolution shaft position and vibration data, this assembly identifies early-stage machinery faults . This capability enables scheduled maintenance interventions rather than emergency shutdowns . The assembly integrates seamlessly into machinery protection systems for power generation and oil and gas facilities. Its proven reliability makes it a trusted choice for critical rotating equipment worldwide.