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Self-Contained 8mm Probe Assembly for Shaft Monitoring
The Bently Nevada 330881-28-07-038-08-02 PROXPAC XL proximity transducer integrates a 3300 XL 8 mm probe with its Proximitor sensor in one rugged housing . This self-contained design eliminates the need for separate extension cables and external sensor enclosures. The assembly provides precise non-contact shaft vibration and position monitoring for critical rotating machinery. It suits steam turbines, gas turbines, compressors, pumps, and generators .
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 330881-28-07-038-08-02 |
| Brand | Bently Nevada |
| Category | PROXPAC XL Proximity Transducer |
| Probe Type | 3300 XL 8 mm with Multiple Approvals |
| Standoff Adapter (B Dimension) | 70 mm |
| Probe Penetration (C Dimension) | 38 mm |
| 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 (BASEEFA verified) |
| 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 | Gold-plated brass ClickLoc® |
| Mounting Thread | 3/4-14 NPT |
| Weight | 1.44 kg (3.2 lb) |
| Country of Origin | USA |
Integrated Design Advantages
The assembly combines the probe, extension cable, and Proximitor sensor into one factory-matched unit. This integrated construction reduces installation complexity and eliminates potential connection points . The PPS thermoplastic housing replaces traditional steel and aluminum enclosures, offering superior chemical resistance . Moreover, the glass and conductive fibers in the housing dissipate electrostatic charges effectively .
Durable Construction for Harsh Environments
The Type 4X and IP66 rated housing provides excellent protection in wet, corrosive, and dusty conditions . The probe operates reliably from -51°C to +177°C, suiting demanding power generation and petrochemical applications . Additionally, the housing withstands impacts up to 4 Joules at extreme temperatures . This robust construction ensures long-term performance in challenging industrial environments.
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 shaft movements and high-speed vibrations . Consequently, the assembly detects early signs of bearing wear, unbalance, and misalignment.
Simplified Installation and Integration
The self-contained design enables direct mounting to the machine casing without external sensor housings . Field wiring connects directly between the assembly and monitoring systems. The assembly supports up to 305 meters of field wiring without signal degradation . This simplifies installation and reduces commissioning time significantly.
Predictive Maintenance Support
By delivering high-resolution shaft position and vibration data, the assembly enables early fault detection. This capability allows scheduled maintenance interventions rather than emergency shutdowns . The assembly integrates seamlessly with 3300 series racks and 3500 series monitors. Its proven reliability makes it a trusted choice for critical rotating equipment worldwide.