330881-28-04-180-06-02 Bently Nevada PROXPAC XL Proximity Transducer

Engineering Overview

The 330881-28-04-180-06-02 is a ruggedized PROXPAC XL assembly designed for industrial environments where the transducer must be protected from external elements. Integrating a 3300 XL 8mm probe within a high-strength PPS thermoplastic housing, this system provides reliable vibration and position monitoring for critical rotating machinery.

Configuration Breakdown

• 330881 — PROXPAC XL Proximity Transducer
  • -28 — Probe & Approvals Option
    • 3300 XL 8mm probe with Multiple Approvals (ATEX/IECEx/CSA)
  • -04 — Standoff Adapter (B Dimension)
    • 40 mm Standoff for precise external housing clearance
  • -180 — Probe Penetration (C Dimension)
    • 180 mm effective reach into the machine casing
  • -06 — Fittings Option
    • One 3/4-14 NPT fitting with 1/2-14 NPT SST reducer and plugs
  • -02 — Mounting Thread Option
    • 3/4-14 NPT standard mounting interface

Technical Specifications

• Brand: Bently Nevada
• Model: 330881-28-04-180-06-02
• Transducer Type: Eddy Current / Inductive
• Linear Range: 2 mm (80 mils) starting at 0.25 mm from target
• Scale Factor (ISF): 7.87 V/mm (200 mV/mil) ±5%
• Frequency Response: 0 to 10 kHz; +0, -3 dB (at 305m field wiring)
• Supply Voltage: -17.5 Vdc to -26 Vdc (12 mA max consumption)
• Housing Rating: IP66 Certified (BASEEFA verified)
• Operating Temp: -51 °C to +177 °C (-60 °F to +350 °F)
• Mechanical Strength: PPS Housing withstands 912 N (205 lbf) loads

Global PLC Spare HUB's Insight

The 330881-28-04-180-06-02 is a preferred solution for "wet" or corrosive applications where standard proximity sensors would fail. Unlike separate probe-and-cable setups, the PROXPAC XL encapsulates the connection point within a UV-resistant, glass-reinforced housing. This significantly mitigates the risk of signal drift caused by connector moisture ingress—a common failure point in cooling tower and hydro-turbine installations.

Typical Applications & Diagnostics

This assembly is engineered for heavy-duty vibration monitoring and condition-based maintenance on:

• Gas & Steam Turbines: Radial vibration and axial thrust position.
• Centrifugal Compressors: Continuous monitoring of shaft stability.
• Large Electric Motors: Bearing wear and rotor dynamic analysis.
• Hydro-Turbines: Detection of shaft orbit abnormalities and runout.
• Diagnostic Capability: Provides raw vibration data for spectral analysis and GAP voltage monitoring to assess probe-to-target distance in real-time.

Logistic & Warranty Terms

• Condition: New & Original in Factory Packing (Made in USA)
• Warranty: 12 Months Factory Warranty
• Shipping Carriers: FedEx, UPS, DHL (International Express)
• Dispatch Time: Fast 24-48 hour processing for in-stock units

Frequently Asked Questions (FAQ)

Why is the penetration depth (180mm) critical for this model?

The 180mm penetration ensures the 8mm probe tip reaches the shaft through the machine insulation and casing thickness. Incorrect depth leads to mechanical interference or loss of signal.

How does the PPS housing benefit my facility compared to metal housings?

The glass-reinforced Polyphenylene Sulfide (PPS) contains conductive fibers for grounding and provides exceptional resistance to UV degradation and chemical corrosion without the weight of metal enclosures.

What field wiring is recommended for a 300-meter run?

For runs up to 305 meters, use 3-conductor shielded triax cable (16 to 24 AWG). Ensure the shield is grounded at the monitor end only to prevent ground loops.

Can this unit be used in hazardous areas?

Yes, the -28 option includes multiple approvals (ATEX/IECEx). Always use appropriate intrinsic safety barriers if your supply voltage is in the more positive range of -23.5 Vdc.

Is the 3300 XL probe interchangeable with other systems?

While the probe tip is a standard 8mm, the 330881-28-04-180-06-02 is a tuned system. Replacing individual components requires verifying the total electrical length to maintain the 200 mV/mil scale factor.

Purchasing Guide

When ordering the 330881-28-04-180-06-02, verify your existing standoff adapter dimensions. The -04 (40mm) standoff is designed to work specifically with the -02 (3/4-14 NPT) mounting thread. If replacing an existing unit, always verify the "B" and "C" dimensions against your machine's technical drawing to avoid installation delays. This model specifically supports the 3300 XL 8mm technology for long-term reliability.

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