330880-28-20-045-01-02 Bently Nevada PROXPAC XL Proximity Transducer

Product Introduction

The Bently Nevada 330880-28-20-045-01-02 is a comprehensive PROXPAC XL proximity transducer system. By integrating the Proximitor sensor directly into the probe housing, this module eliminates the need for external mounting racks and long extension cables between the probe and the driver. This "all-in-one" design is specifically engineered for high-reliability vibration monitoring in harsh industrial sectors. For precise installation tolerances and mechanical drawings, please download the technical manual: Download PROXPAC XL Technical Data Sheet.

Configuration Logic & Tree

• 330880 — PROXPAC XL Proximity Transducer Assembly
  • └─ 28 — 3300 XL 8mm Probe (Multiple Worldwide Approvals)
  • └─ 20 — Standoff Adapter (B Dimension): 2.0 inches
  • └─ 045 — Probe Penetration (C Dimension): 45 mm
  • └─ 01 — Fittings: One 3/4-14 NPT fitting, two plugs
  • └─ 02 — Mounting Thread: 3/4-14 NPT

Core Engineering Specifications

• Manufacturer: Bently Nevada
• Model: 330880-28-20-045-01-02
• Linear Range: 2 mm (80 mils) with a 7.87 V/mm (200 mV/mil) ±5% scale factor
• Frequency Response: 0 to 10 kHz (+0, -3 dB) for high-speed shaft analysis
• Environmental Rating: IP66 verified; UV-resistant PPS thermoplastic housing
• Temperature Resilience: Probe rated for -51 °C to +177 °C (-60 °F to +350 °F)
• Power Requirements: -17.5 Vdc to -26 Vdc (Negative voltage logic)
• Material Integrity: AISI 304 Stainless Steel probe case and gold-plated ClickLoc connectors
• Mechanical Strength: Housing withstands 7 Joule impacts at ambient temperature

Global PLC Spare HUB's Insight

The 330880-28-20-045-01-02 is a masterpiece of field-integrated engineering. By housing the Proximitor inside the PPS enclosure, Bently Nevada has minimized signal attenuation and electromagnetic interference risks common in long-cable runs. This specific 45mm penetration with a 2-inch standoff is the "standard choice" for bearing pedestals with medium-thickness insulation. The conductive fibers in the housing provide a built-in Faraday cage, ensuring signal purity even near high-voltage motor leads.

Application & Diagnostics

• Target Machinery: Steam and gas turbines, large-scale centrifugal compressors, and industrial pumps.
• Key Use Cases: Continuous radial vibration monitoring, axial thrust position measurement, and Keyphasor speed sensing.
• Diagnostic Power: Ideal for identifying shaft unbalance, misalignment, and fluid-film bearing instability (oil whirl/whip).

Technical Selection Comparison

• 330880-28-40-058-01-02: Longer 4.0" standoff and 58mm reach for deep-recessed shafts.
• 330880-16-00-045-00-02: 5mm/8mm probe option without standoff. For direct-to-case mounting.
• Recommendation: Ensure the C Dimension accounts for the gasket thickness to reach the 1.27mm (50 mil) gap midpoint.

Commercial & Logistics

• Condition: New and Original Factory Packing (Made in U.S.A.)
• Warranty: 12 Months Comprehensive Warranty
• Global Dispatch: Ships within 24-48 hours
• Express Delivery: Secure transit via FedEx, UPS, or DHL

Technical FAQ (Expert Guidance)

• Q: How does the "Standoff" affect the mechanical installation?
• A: The 2.0-inch standoff (Option 20) provides the necessary clearance to mount the transducer housing outside of machine lagging while maintaining a rigid connection to the bearing case.
• Q: What is the risk of using this probe below -34 °C?
• A: While the probe operates at lower temperatures, the internal pressure seal may fail if exposed to sustained sub-zero conditions without machine heat, potentially causing oil leakage.
• Q: Can I use standard 2-wire field wiring?
• A: No. We recommend 3-conductor shielded triax cable (16 to 24 AWG) to ensure the shield provides a low-impedance ground path, protecting the signal from industrial noise.
• Q: Does the housing require separate grounding?
• A: The PROXPAC XL includes an internal grounding liner. Ensure the mounting thread has a clean metal-to-metal contact with the machine case for optimal RFI shielding.
• Q: Is the probe tip replaceable within the PROXPAC assembly?
• A: No, the probe and cable are integrated. If the tip is damaged by a shaft rub, the entire probe sleeve assembly within the housing must be serviced to maintain calibration.

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