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Self-Contained Vibration and Position Sensor for Turbomachinery
The Bently Nevada 330881-28-05-058-08-02 PROXPAC XL proximity transducer integrates a 3300 XL 8 mm probe and Proximitor sensor into a single housing. This self-contained design eliminates the need for separate extension cables and external sensor enclosures. The assembly provides accurate non-contact shaft vibration and position measurements for critical rotating equipment. It serves steam turbines, gas turbines, compressors, pumps, and generators.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 330881-28-05-058-08-02 |
| Brand | Bently Nevada |
| Category | PROXPAC XL Proximity Transducer |
| Probe Type | 3300 XL 8 mm with Multiple Approvals |
| Standoff Adapter (B Dimension) | 50 mm |
| Probe Penetration (C Dimension) | 58 mm |
| Approvals Option | Multiple Approvals |
| Scale Factor | 7.87 V/mm (200 mV/mil) ±5% |
| Linear Range | 2.0 mm (80 mils) from 0.25 mm to 2.3 mm |
| Frequency Response | 0 to 10 kHz |
| Recommended Gap Setting | 1.27 mm (50 mils) |
| Output Resistance | 50 Ω |
| Supply Voltage | -17.5 Vdc to -26 Vdc |
| Current Consumption | 12 mA maximum |
| Operating Temperature | -51°C to +177°C |
| Housing Rating | Type 4X and IP66 |
| Housing Material | UV-resistant, glass-reinforced PPS thermoplastic |
| Probe Tip Material | Polyphenylene Sulfide (PPS) |
| Probe Case Material | AISI 304 stainless steel |
| Probe Cable | 1-meter, 75Ω triaxial, FEP-insulated |
| Connector Type | Gold-plated brass ClickLoc® |
| Mounting Thread | 3/4-14 NPT |
| Weight | 1.44 kg (3.2 lb) |
| Country of Origin | USA |
Integrated Design for Simplified Installation
The assembly combines the probe, extension cable, and Proximitor sensor into one factory-matched unit. This integrated construction significantly reduces installation time and eliminates potential failure points. The PPS thermoplastic housing replaces traditional steel enclosures, offering superior chemical resistance and lighter weight . Furthermore, the housing effectively dissipates electrostatic charges to protect sensitive electronics.
Rugged Construction for Demanding Environments
The Type 4X and IP66 rated housing provides excellent protection against water, corrosion, and dust ingress . The probe operates reliably from -51°C to +177°C, suiting extreme power generation and petrochemical environments . The housing withstands impact forces up to 4 Joules across the full temperature range . This robust design ensures long-term reliability in harsh industrial conditions.
Precision Measurement Capability
The eddy-current sensing technology delivers precise displacement readings across the 2 mm linear range . The 7.87 V/mm scale factor ensures accurate vibration and position measurements. The frequency response from 0 to 10 kHz captures both slow movements and high-speed vibrations . Consequently, the assembly enables early detection of bearing wear, unbalance, and misalignment.
Simplified Field Wiring and Integration
The self-contained design allows direct mounting to the machine casing without external sensor housings . Field wiring connects directly from the assembly to monitoring systems. The assembly supports up to 305 meters of field wiring without signal degradation . This simplifies installation and reduces overall system cost.
Condition Monitoring and Protection
By delivering high-resolution shaft position and vibration data, the assembly enables early fault identification. This capability allows planned maintenance rather than unexpected outages . The assembly integrates seamlessly with 3300 series racks and 3500 series monitors. Its proven performance makes it a trusted solution for critical rotating equipment worldwide.