Bently Nevada 330851-02-000-050-90-00-CN 3300 XL 25 mm Proximity Probe

Description

Engineered for demanding turbomachinery protection environments, the Bently Nevada 330851-02-000-050-90-00-CN proximity probe delivers highly stable non-contact static and dynamic displacement measurements. This sensor is a core constituent of the 3300 XL 25 mm Proximity Transducer System, specifically configured to monitor thrust displacement, differential expansion, and shaft position in utility-class steam turbines, gas turbines, and heavy industrial compressors.

Features

• Extended Linear Range: Specifically calibrated for large-displacement parameters where standard 8 mm probes lack sufficient measurement span.
• Robust Mechanical Design: M30x2 metric threaded stainless steel case offering structural resistance to high-torque field installation.
• Unarmored Routing Configuration: Equipped with a 9.0-meter coaxial cable optimized for protective conduit layouts.
• Hermetic Integration: The 25 mm tip structure features oil and chemical resistance, safeguarding the internal coil from harsh turbine-well fluids.
• Target Compatibility: Calibrated as standard for high-accuracy tracking on AISI 4140 steel target materials.

Applications

• Thrust position and axial wear monitoring in heavy industrial steam/gas turbines.
• Differential expansion tracking of turbine rotors relative to the machine casing.
• Dynamic radial vibration measurements in heavy-duty utility machinery.
• Reciprocating compressor rod drop and shaft position detection.

Technical Specifications

Empirical Engineering Insights

Alternative Models & Compatibility

The 330851-02-000-050-90-00-CN 25 mm probe is electrically distinct from standard 8 mm or 5 mm proximity probe systems. This unit must never be connected to 3300 XL 8 mm Proximitor Sensors, as mismatching the probe coil inductance with the incorrect driver will prevent calibration and trigger system error states. This probe is exclusively compatible with 3300 XL 25 mm Proximitor Sensors.

Application Pitfalls & Engineering Notes

Because of the large 25 mm diameter sensor tip, this probe exhibits a larger electromagnetic field footprint compared to smaller probes. To avoid cross-talk or side-wall interference, engineers must maintain a clear radial distance of at least 76 mm (3.0 inches) from any adjacent metallic objects. Standard factory calibration is performed with AISI 4140 steel targets; using other target alloy profiles will result in scale-factor deviation.

Commissioning & Wiring Tips

When routing the unarmored 9.0-meter integrated coaxial cable, ensure the minimum bend radius of 25.4 mm (1.0 inch) is strictly observed to prevent fracturing the inner conductor. To ensure signal integrity at the monitor, protect the miniature coaxial connectors inside a dedicated junction box, and seal all thread junctions with self-coalescing silicone tape to block the entry of moisture and chemical vapors.

Installation Guidelines