Description

Providing critical structural and dynamic displacement feedback, the Bently Nevada 330876-03-90-00-CN operates as a heavy-duty, threadless 3300 XL 50 mm Proximity Probe engineered for non-contacting vibration and position measurements. Designed to interface directly with industrial machinery protection systems, this transducer delivers high-precision measurements of shaft vibration and axial position on large-scale rotating assets. The AISI 304 stainless steel case is configured with a 1.99-inch smooth diameter with a side-exit cable routing, enabling low-profile installation in tight mechanical envelopes. It features a robust Polyphenylene Sulfide (PPS) tip sealed with Viton O-rings to withstand differential pressure boundaries, and utilizes a high-temperature FluidLoc cable assembly to prevent process fluid migration.

Key Features

• High-Temperature FluidLoc Cable: Designed to block internal fluid and gas bypass, maintaining seal integrity along the cable run under extreme conditions.
• Viton O-ring Sealing: Built to isolate and seal differential pressure between the probe tip and the external case.
• AISI 304 Stainless Steel Housing: High mechanical rigidity and chemical resistance within demanding steam turbine and compressor environments.
• Side-Exit Smooth Case: 1.99-inch diameter threadless case layout allows optimized side-clearance mounting.
• Extended Length System: Direct 9.0-meter system configuration eliminates the need for intermediate extension cables in select system topologies.

Applications

• Thrust and radial shaft vibration monitoring in large steam and gas turbine generators.
• Differential expansion and axial position measurement in utility-scale turbines.
• Hydroelectric generator shaft alignment and structural displacement tracking.
• Heavy industrial gearboxes, large-scale pumps, and centrifugal compressors.

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

The 3300 XL 50 mm proximity probe system is designed specifically for applications requiring a wide linear range (such as differential expansion monitoring). It is critical to note that the 50 mm probe is not compatible with standard 3300 XL 8 mm or 11 mm Proximitor Sensors. This model must be paired exclusively with a dedicated 3300 XL 50 mm Proximitor Sensor. Substituting or mixing sensor types will result in severe scale factor errors and system calibration failure.

Application Pitfalls & Engineering Notes

While the 3300 XL probes are equipped with dual Viton O-rings to prevent fluid bypass under pressure, they are not high-pressure tested prior to shipment as a standard factory procedure. If the application environment involves immersion in pressurized oil sumps or critical containment boundaries, user-side pressure verification or dynamic pressure-seal testing is highly recommended before commissioning. Additionally, ensure the FluidLoc cable is supported with adequate conduit protection to prevent high mechanical shearing in high-velocity turbine exhaust pathways.

Commissioning & Wiring Tips

Because of the massive 50 mm probe tip diameter, ensure that the mechanical cross-talk clearance zone is strictly maintained. Keep adjacent metal structures outside the projected RF sensing field (typically at least 3 probe tip diameters of radial spacing) to avoid false calibration shifts. When deploying the 9.0-meter option, never trim or splice the high-frequency coaxial cable; any alterations to the physical cable length will corrupt the electrical tuning of the system and degrade signal accuracy.

Installation Guidelines