330880-28-40-058-01-02 Bently Nevada PROXPAC XL Transducer Assembly

Engineering Overview

The 330880-28-40-058-01-02 represents the pinnacle of environmental protection for eddy current sensor technology. This PROXPAC XL assembly integrates a high-precision 3300 XL 8mm probe into a specialized thermoplastic housing designed to withstand extreme mechanical impact and chemical exposure.

For detailed installation tolerances and wiring schematics, download the official technical manual: Download Bently Nevada PROXPAC XL Datasheet

Configuration Hierarchy

• 330880 — PROXPAC XL Proximity Transducer Assembly
  • -28 — Probe and Approvals Option
    • 3300 XL 8mm probe with Multiple Approvals (ATEX, IECEx, CSA)
  • -40 — Standoff Adapter (B Dimension)
    • 4.0 inch Standoff for extended housing clearance
  • -058 — Probe Penetration (C Dimension)
    • 58 mm effective probe depth into the machine casing
  • -01 — Fittings Option
    • One 3/4-14 NPT fitting with two high-pressure plugs
  • -02 — Mounting Thread Option
    • 3/4-14 NPT integrated mounting interface

Technical Parameters

• Manufacturer: Bently Nevada
• Model: 330880-28-40-058-01-02
• Output Scale Factor: 7.87 V/mm (200 mV/mil) ±5%
• Linear Range: 2.0 mm (80 mils) from approx. 0.25 mm gap
• Frequency Response: 0 to 10 kHz (+0, -3 dB rolloff)
• Housing Material: Glass-reinforced PPS (Ultraviolet resistant)
• Ingress Protection: IP66 verified (BASEEFA report T07/0709)
• Operating Temperature: -51 °C to +177 °C (-60 °F to +350 °F)
• Maximum Consumption: 12 mA at -17.5 Vdc to -26 Vdc

Global PLC Spare HUB's Insight

The 330880-28-40-058-01-02 is specifically tailored for outdoor or "wash-down" environments where traditional aluminum housings might corrode. Our field analysis shows that the glass-reinforced PPS housing provides superior EMI/RFI shielding thanks to integrated conductive fibers. This makes the PROXPAC XL indispensable for cooling tower fans and hydroelectric turbines where moisture and stray electrical noise are constant challenges.

Typical Applications & Diagnostic Potential

This system is engineered for the following critical equipment:

• Large Cooling Tower Fans: Monitoring radial vibration and blade pitch.
• Hydroelectric Turbines: Tracking shaft centerline position and orbit.
• Main Feedwater Pumps: Axial thrust position monitoring for cavitation detection.
• Industrial Gearboxes: Early detection of gear mesh frequencies and bearing wear.

Logistics & Quality Guarantee

• Condition: New & Original in Factory Packing (Made in USA)
• Warranty: 12 Months Factory Warranty Coverage
• Shipping Carriers: Express delivery via FedEx, UPS, or DHL
• Dispatch Timeline: Ships within 24-48 hours of order processing

Frequently Asked Questions (FAQ)

How does the 4.0-inch standoff (Option -40) impact installation?

The standoff provides extra clearance to mount the housing away from the machine surface, facilitate access to terminal blocks, and protect electronics from conductive heat transfer.

What is the significance of the conductive fibers in the PPS housing?

These fibers provide an electrical ground path that dissipates static charge and shields the internal probe signals from external electromagnetic interference (EMI).

Why is there a minimum shaft diameter requirement of 50.8 mm (2.0 in)?

Eddy current sensors are sensitive to surface curvature. Using the 3300 XL 8mm probe on smaller shafts can cause non-linearity in the scale factor.

How should the field wiring be terminated?

We recommend using tinned 3-conductor shielded triaxial cable. Ensure the shield is isolated from the housing and only grounded at the monitoring rack to prevent ground loops.

What happens if the power supply is more positive than -23.5 Vdc?

In systems utilizing safety barriers, a voltage more positive than -23.5 Vdc may restrict the linear range, potentially clipping the signal at higher vibration amplitudes.

Procurement & Selection Guide

When selecting the 330880-28-40-058-01-02, pay close attention to the "C" Dimension (58mm). This must include the thickness of the machine casing and any mounting gaskets to ensure the probe tip sits within the linear window from the shaft. Always verify that your 3300 XL Proximitor is calibrated for the appropriate system length to maintain signal integrity.

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