Description

Engineered for precise dynamic and static distance measurements within critical rotating machinery, the Bently Nevada 330102-20-73-05-02-CN is an industrial-grade 3300 XL series 8 mm proximity probe. Operating as a core component of a non-contacting eddy current sensor system, this probe delivers reliable shaft vibration, position, and speed feedback for turbomachinery diagnostics. This specific model features a 3/8-24 UNF threaded body, integrated stainless steel fluid-tight armor, a 2.0-inch unthreaded length, a 7.3-inch overall case length, a 0.5-meter total cable length, and standard ClickLoc miniature coaxial connectors. Designed with specialized agency approvals for specific regional environments, it ensures exceptional longevity and resistance to aggressive industrial lubricants and harsh chemical environments.

Key Features

• 8 mm Probe Tip: Optimized for standard Bently Nevada proximity transducer systems with balanced magnetic field distribution.
• Rugged Stainless Steel Armor: Shielded outer casing protects internal coaxial conductors from mechanical cuts, abrasions, and hot oil splashes.
• ClickLoc Coaxial Connector: Features a gold-plated brass body with a positive locking mechanism to prevent loose connections in high-vibration panels.
• Fluid-Tight Construction: Polyphenylene sulfide (PPS) tip material resists degradation from synthetic lubricants, water, and process chemicals.

Applications

• Radial vibration monitoring on high-speed hydrodynamic journal bearings.
• Axial thrust position measurement on steam/gas turbines and centrifugal compressors.
• Phase reference and keyphasor speed measurements on industrial gearboxes.
• Eccentricity monitoring on large generators and utility-scale pumps.

Technical Specifications

Connections and Interfaces

Empirical Engineering Insights

Alternative Models & Compatibility

This 0.5-meter probe is configured specifically to pair with standard 4.5-meter or 8.5-meter extension cables to complete overall system lengths of 5.0 meters or 9.0 meters. Substituting an unarmored 330101 series probe in an environment that requires armor will lead to premature cable failure due to routing friction or cutting. Ensure the Proximitor sensor calibration matches the total electrical system length (5m vs 9m).

Application Pitfalls & Engineering Notes

Keep the minimum static bend radius of the armored cable above 25 mm (1.0 inch). Bending the cable past this point risks breaking the inner coaxial shielding, resulting in high noise-to-signal ratios or intermittent readings. Additionally, ensure a minimum of 16 mm (twice the tip diameter) of lateral clearance from surrounding structural metal to prevent side-view eddy current interference.

Commissioning & Wiring Tips

Before powering up the system, use a calibrated digital multimeter to verify the resistance between the probe tip center pin and the outer shield (typically 5.0 to 11.0 ohms, depending on cable temperature). Always clean the coaxial connectors with isopropyl alcohol before mating them to ensure oil residues do not compromise the RF path.

Installation Guidelines