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This 50 mm eddy current probe delivers precise shaft vibration and position measurements for large-scale turbomachinery. It operates as a specialized component within the Bently Nevada 3300 XL transducer system for critical asset monitoring. The probe generates a voltage output that varies linearly with the gap between its tip and the conductive target surface. Additionally, it meets API 670 standards for mechanical configuration, linear range, and temperature stability.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | 330876-01-90-00-05 |
| Product Type | 3300 XL 50 mm Proximity Probe |
| Thread Size | 1-14 UNS (Option 01) |
| Unthreaded Length | 90.0 mm / 3.54 in (Option 90) |
| Overall Case Length | 0.0 mm (Option 00, fully threaded) |
| Total Probe Length | 5.0 meters / 16.4 feet (Option 05) |
| Connector Type | Miniature coaxial ClickLoc |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Case Material | AISI 303 stainless steel |
| Cable Insulation | FEP high-temperature material |
| Linear Range | 12.7 mm (500 mils) from 2.3 to 15 mm gap |
| Recommended Gap | 5.08 mm @ -9 VDC (approx. 200 mils) |
| Sensitivity | 0.787 V/mm (20 mV/mil) ±5% |
| Operating Temperature | -35°C to +177°C |
| Weight | 1.0 kg |
| Approvals | CSA, ATEX, IECEx |
Design and Installation Advantages
This probe employs a 1-14 UNS thread for secure mounting in large machine casings. The 90.0 mm unthreaded length provides exceptional positioning flexibility for deep-hole installations. Its fully threaded case configuration (0.0 mm overall case length) allows maximum thread engagement for superior mounting stability. Furthermore, the 5.0 meter total cable length connects directly to a Proximitor sensor without requiring extension cables. This design minimizes signal loss and simplifies system integration.
Performance Characteristics
This probe delivers a 12.7 mm linear measurement range for monitoring large shaft movements. The 0.787 V/mm sensitivity ensures stable and repeatable readings across the entire operating range. The system supports full interchangeability of probes, extension cables, and Proximitor sensors. Consequently, users can replace individual components without system recalibration, reducing maintenance downtime.
Application Suitability
This probe excels at monitoring radial vibration and thrust position in large turbines, compressors, and generators. Its extended linear range accommodates significant shaft excursions during start-up and shutdown transients. The PPS tip and stainless steel construction resist harsh process conditions and chemical exposure. Therefore, this probe suits power generation, oil and gas, and heavy industrial environments where large machinery demands robust monitoring.