330881-28-10-142-03-02 Bently Nevada PROXPAC XL Proximity Transducer

Product Introduction

The Bently Nevada 330881-28-10-142-03-02 represents an all-in-one solution for proximity measurements in rugged industrial environments. This PROXPAC XL assembly integrates a 3300 XL 8mm probe and a Proximitor sensor into a single high-strength thermoplastic housing. This design simplifies installation by eliminating the need for separate enclosures. For comprehensive wiring diagrams and frequency response curves, please download the technical manual here: Download PROXPAC XL Datasheet & Manual.

Configuration Hierarchy

• 330881 — PROXPAC XL Proximity Transducer Series
  • └─ 28 — 3300 XL 8mm Probe (Multiple Agency Approvals)
  • └─ 10 — Standoff Adapter (B Dimension): 100 mm
  • └─ 142 — Probe Penetration (C Dimension): 142 mm
  • └─ 03 — Fittings: One M20 fitting, two plugs
  • └─ 02 — Mounting Thread: 3/4-14 NPT

Core Engineering Specifications

• Manufacturer: Bently Nevada
• Model: 330881-28-10-142-03-02
• Linear Range: 2 mm (80 mils), starting at 0.25 mm (10 mils) from target
• Sensitivity (ISF): 7.87 V/mm (200 mV/mil) ±5%
• Frequency Response: 0 to 10 kHz (+0, -3 dB)
• Housing Rating: IP66 verified BASEEFA (UV-resistant glass-reinforced PPS)
• Supply Voltage: -17.5 Vdc to -26 Vdc (Negative Logic)
• Output Resistance: 50 Ω (Field wiring 16 to 24 AWG)
• Standard Compliance: Certified for impact resistance at extreme temperatures (-39°C to 115°C)

Global PLC Spare HUB's Insight

The 330881-28-10-142-03-02 is a "Field-Ready Powerhouse." Engineering personnel prefer this model for outdoor or high-corrosion areas because the Proximitor is sheltered within the glass-reinforced PPS housing. This specific 142mm penetration version is ideal for machines with thicker thermal insulation or reinforced bearing pedestals where standard probes cannot reach the shaft surface. The conductive fibers in the housing provide superior RFI/EMI shielding in electrically noisy environments.

Target Equipment & Diagnosis

• Primary Equipment: Steam turbines, centrifugal compressors, and industrial gearboxes.
• Diagnostic Capability: Provides high-fidelity orbit plots to detect shaft cracks, unbalance, and bearing clearance degradation.
• Application: Radial vibration monitoring and axial thrust position sensing.

Selection Comparison & Technical Advice

• 330881-28-04-180-06-02: Longer 180mm penetration for deep-seated internal shafts.
• 330881-28-00-135-03-00: Zero standoff configuration. Best for direct-mount flush applications.
• Advice: Always verify that the "Total Reach" allows the probe tip to maintain the 1.27mm (50 mil) recommended gap setting at the shaft's resting position.

Logistics & Warranty

• Condition: New & Original in Factory Packing (Made in U.S.A.)
• Warranty: 12 Months Industrial Warranty
• Shipping: 24-48 hour dispatch via FedEx, UPS, or DHL

Technical FAQ (Field Experience)

• Q: What happens if I supply a voltage more positive than -23.5 Vdc with barriers?
• A: The linear range may be reduced. For full 80-mil performance, ensure your power supply maintains the specified negative voltage window under load.
• Q: How does the "Standoff" (B Dimension) affect my measurement?
• A: The standoff moves the housing away from the machine surface to provide clearance for insulation while allowing the probe to reach the shaft via the C Dimension.
• Q: Can the PPS housing withstand physical impact in cold weather?
• A: Yes. The 330881 is BASEEFA certified to withstand 4 Joule impacts at -39°C, making it suitable for extreme northern or offshore climates.
• Q: What is the maximum field wiring distance for this unit?
• A: You can run up to 305 meters (1,000 feet) of 3-conductor shielded triax cable without significant signal rolloff below 10 kHz.
• Q: Why is the ground liner material made of AISI 304 Stainless Steel?
• A: To provide a low-impedance path to earth ground, which is critical for preventing signal noise from electromagnetic interference (EMI).

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