Bently Nevada 330876-03-50-01-00 3300 XL 50 mm Proximity Probe

Description

Designed for high-precision displacement and vibration measurements on large industrial rotating machinery, the Bently Nevada 330876-03-50-01-00 functions as a critical component of the 3300 XL 50 mm proximity transducer system. This ruggedized 50 mm eddy current sensor is engineered to withstand extreme environment exposures while delivering consistent, non-contacting dynamic measurements. Featuring a robust smooth side-exit case design and a high-temperature FluidLoc cable with protective armor, this probe provides exceptional structural integrity and signal protection in harsh, fluid-exposed industrial settings.

Features

• High-Temperature FluidLoc Cable: Designed with specialized FluidLoc blocking to prevent the migration of process fluids along the internal cable core.
• Protective Flexible Armor: Stainless steel armor protects the physical coaxial cable from mechanical impact, sharp bends, and abrasive wear.
• Smooth Side-Exit Case: The 1.99-inch diameter smooth cylindrical case configuration optimizes installation clearances in specialized machine housings.
• Extended 5.0-Meter Length: Built with an exact system length of 5.0 meters (16.4 feet) to maintain correct electrical match parameters with corresponding proximitor sensors.
• Dynamic Vibration and Position Monitoring: Optimized for critical differential expansion, thrust position, and shaft vibration measurements on utility-scale steam and gas turbines.

Applications

• Steam turbine-generator set shaft vibration and axial thrust measurements.
• Industrial gas turbine casing expansion and differential expansion monitoring.
• Heavy petrochemical compressor and expander hydrodynamic bearing monitoring.
• High-temperature fluid pump shaft displacement observation under harsh process conditions.

Technical Specifications

Empirical Engineering Insights

Operating and maintaining large-scale machinery sensor networks requires strict adherence to system-level configuration parameters. Below are practical field engineering insights for this specific probe model:

Alternative Models & Compatibility

This 50 mm probe is specifically matched to the 3300 XL 50 mm Proximitor Sensor (typically the 330780 series). It is electrically incompatible with standard 3300 XL 8 mm, 11 mm, or 25 mm systems. Replacing a standard probe with this high-displacement probe requires a complete system calibration change, including matching Proximitor sensor electronics and recalibrating the monitoring rack channel configurations.

Application Pitfalls & Engineering Notes

When routing the high-temperature FluidLoc cable, ensure the stainless steel armor does not rub against sharp structural metal corners. Despite the FluidLoc construction preventing capillary-action fluid migration, constant mechanical vibration can wear through the armor and outer jacket, resulting in ground loops or intermittent shield-to-ground faults. Observe a minimum bend radius of 25.4 mm (1.0 inch) for armored cables during route planning.

Commissioning & Wiring Tips

Verify the absolute electrical physical system length (probe plus any extension cable) matches the Proximitor's calibrated length rating of 5.0 meters. Mismatched system lengths will distort the RF scale factor, causing significant linearity errors across the probe's expanded measurement range. Clean all coaxial connectors with a zero-residue contact cleaner and secure the connection using the recommended connector protector kits to prevent oil ingress at the junction point.

Installation Guidelines