330880-28-25-061-01-02 Bently Nevada PROXPAC XL Proximity Transducer

Bently Nevada PROXPAC XL Transducer Overview

The 330880-28-25-061-01-02 is a specialized PROXPAC XL proximity transducer assembly engineered by Bently Nevada for non-contact shaft vibration and axial position measurement in harsh machinery environments. The self-contained, weatherproof housing encloses a 3300 XL 8 mm eddy current probe and internal Proximitor sensor electronics, providing direct linear voltage output proportional to target distance.

Built with glass-reinforced polyphenylene sulfide (PPS) thermoplastic housing and AISI 304 stainless steel components, this assembly withstands 4 Joule structural impacts and is BASEEFA-certified to IP66 ratings. Operating on -17.5 Vdc to -26 Vdc supply rails, it delivers a calibrated 7.87 V/mm (200 mV/mil) scale factor over an 80 mil (2 mm) linear range.

Model Configuration Tree

330880 [PROXPAC XL Proximity Transducer Assembly]
├── -28 : Probe & Approvals Option
│   └── 3300 XL 8 mm probe with Multiple Agency Approvals
├── -25 : Standoff Adapter Option (B Dimension)
│   └── 2.5 in (63.5 mm) Standoff Adapter
├── -061 : Probe Penetration Option (C Dimension)
│   └── 61 mm Penetration Length
├── -01 : Cable/Conduit Fitting Option
│   └── One 3/4-14 NPT fitting, two secondary plugs
└── -02 : Mounting Thread Option
    └── 3/4-14 NPT Thread (Matches Standoff Adapter)

Technical Parameter Matrix

Machine Compatibility & Diagnostics

Target Equipment & Condition Monitoring Capabilities

• Target Equipment Applications: High-speed boiler feed pumps, steam turbine fluid-film bearings, centrifugal gas compressors, industrial gearboxes, and large electric motor drives.
• Shaft Dynamic Vibration Tracking: Captures high-frequency radial shaft vibration up to 10 kHz, aiding early detection of rotor unbalance, shaft misalignment, and oil whirl instabilities.
• Axial Position & Thrust Monitoring: Measures dynamic axial rotor displacement to prevent catastrophic rotor-to-stator contact during thrust bearing breakdown.
• Signal Loss & Gap Fault Warnings: Voltage shifts past -1 Vdc or -17 Vdc signal mechanical gap deviation, damaged probe tips, or broken field wiring to 3500 series monitoring racks.
• Enclosure Protection Watchdog: IP66 conductive PPS housing protects internal ClickLoc connectors from oil spray, corrosive atmospheric gases, and moisture condensation.

Global PLC Spare HUB's Insight

Field Installation & Engineering Notes

• The 330880-28-25-061-01-02 integration combines the sensor element and weather housing, eliminating the need for external junction boxes around hot turbomachinery.
• Maintain a 15.2 mm target surface diameter and 50.8 mm minimum shaft diameter to avoid electrical cross-talk or scale factor distortion.
• Tighten the sleeve locknut to 39.3 N·m (350 in·lb) and retaining nut to 29.5 N·m (260 in·lb) during installation to preserve sealing integrity under severe machine vibration.
• Keep field wiring runs under 305 meters using 3-conductor shielded triax cable to maintain high-frequency signal response up to 10 kHz without signal attenuation.

Commercial Logistics & Warranty

Global Supply Protocols

• Protected by a 12-month full warranty.
• Global priority freight via FedEx, UPS, and DHL.
• Dispatched in static-safe, heavy-duty protective packaging with factory calibration compliance verification.

Frequently Asked Questions (FAQ)

Field Engineering & Installation Guidance

Q: How is the physical gap voltage set during field installation of this transducer?
A: Adjust probe depth until output voltage reads approximately -9.0 Vdc (matching the 1.27 mm / 50 mil nominal gap) on a calibrated digital multimeter before securing the locknut.

Q: What happens if the probe tip is exposed to ambient operating temperatures below -34°C?
A: Sub-zero exposure below -34°C (-29°F) can degrade internal elastomeric seals, increasing the risk of fluid ingress under high casing pressures.

Q: Why must field wiring use 3-conductor tinned shielded triaxial cable?
A: Tinned triaxial shielding prevents ground loops and ambient electromagnetic noise from corrupting high-frequency 200 mV/mil vibration signals routed over long distances to monitoring racks.

Q: Can the internal ClickLoc probe connector be disconnected during housing installation?
A: Yes, the gold-plated ClickLoc connector disconnects quickly to allow insertion of the stainless steel probe sleeve without twisting the internal FEP triaxial cable.

Q: What specifies the mounting thread interface on this standoff adapter arrangement?
A: Option 02 designates a standard 3/4-14 NPT thread, providing a pressure-tight seal when mated directly to machine bearing housings or mounting brackets.

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