Bently Nevada 330908-00-55-05-02-00 3300 XL NSv Proximity Probe

Description

The 330908-00-55-05-02-00 is an eddy-current 3300 NSv Proximity Probe engineered by Bently Nevada for non-contacting machinery displacement and dynamic shaft vibration monitoring loops. This fractional-thread transducer operates as an integrated sensor input within the 3300 XL NSv Proximity Transducer System, which is specifically deployed in centrifugal air compressors, refrigeration compressors, and process gas compressors characterized by highly confined internal measurement footprints. By projecting a high-frequency radio frequency (RF) carrier field into the adjacent target area, the sensor continuously captures micro-gap transitions caused by surface-level eddy currents and relays this raw analog displacement wave back to a remote Proximitor module.

This specialized sensor is engineered for application zones where deep counterbores, severe sideview visibility constraints, or limited rear clearance prohibit the use of standard 5 mm or 8 mm proximity probe designs. The 330908-00-55-05-02-00 configuration features a 3/8-24 UNF fractional threaded steel casing without an armor sleeve, making it highly flexible for routing through tight internal machine internal conduits or protective pathways. It is calibrated to measure dynamic radial vibration on narrow shafts smaller than 51 mm (2 in) or axial thrust position on flat target surfaces smaller than 15 mm (0.6 in). Operating without external agency certifications under this general-purpose designation, the probe delivers a continuous linear displacement signal to host diagnostic platforms.

Features

• Low-profile transducer tip architecture engineered for tight machinery counterbores and restricted sideview clearance paths.
• Rugged 3/8-24 UNF fractional fully-threaded casing without armor, offering a lightweight and flexible form factor for restricted cable routing pathways.
• Integrated gold-plated brass ClickLoc miniature coaxial plug delivering a low-loss, vibration-proof positive locking wire link.
• High-stability sensor coil optimized to track small target areas, including micro-diameter rotating shafts under 51 mm.
• Full drop-in backward compatibility with legacy Bently Nevada 3300 RAM transducer systems and 190 series processing architectures.

Applications

• Radial shaft vibration and dynamic fluid-film bearing displacement tracking on industrial high-speed centrifugal compressors.
• Dual-direction rotor axial thrust position offset capture inside compact turbo-expander gearboxes.
• Rotating target speed detection, zero-speed confirmation, and Keyphasor phase reference signal generation in tight spaces.

Mechanical Profile & Exact Weight Formulas

In high-integrity asset tracking, using non-specific box dimensions can cause mechanical fouling during bracket adjustment. Per official Bently Nevada datasheet technical constants, the physical geometry and cumulative dry mass metrics for this specific 0.5-meter fully threaded probe are precisely calculated below:

• Unthreaded Case Length (Option A): Exactly 0.0 inches (0 mm) indicating a fully threaded barrel profile.
• Overall Case Length (Option B): Exactly 5.5 inches (139.7 mm) representing an extended-reach structural case length.
• Threaded Case Section: Calculated as Overall Case Length minus Unthreaded Length (5.5 in - 0.0 in) = 5.5 inches (139.7 mm) of active 3/8-24 UNF threads.
• Total Physical Cable Length (Option C): Exactly 0.5 meter (1.6 feet / 19.7 inches) measured from the probe tip face to the terminal coax joint.
• Linear Mass Density of Unarmored Cable: Nominal 33 grams per meter (0.35 oz/foot) driven by the unarmored, lightweight standard coaxial skin.
• Net Probe Head and Long-Case Mass: Approximately 55 grams (1.94 oz) including the extended 5.5-inch AISI 304 stainless steel threaded shell, sensing coil, and transition hub assembly.
• Total Net Hardware Weight: Calculated as (33 g/m x 0.5 m) + 55 g = 71.5 grams (2.52 oz) absolute net hardware weight per unit (excluding shipping boxes and the accompanying 9/16-inch industrial lock nut).

Ordering Information

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Total System Loop Matching: This 0.5-meter physical length probe must be paired with a 4.5-meter extension cable to form a 5.0-meter total system loop, or a 6.5-meter extension cable to form a 7.0-meter total system loop. The total length must precisely match the electrical calibration length of the 3300 XL NSv Proximitor sensor.
• Mechanical Gap Adjustment: Manually thread the probe into the machine casing until the tip contacts the target surface, then back it out to the designated linear gap voltage threshold (typically -9.0 Vdc or central linear range) before tightening the 9/16-inch lock nut.
• Avoid Ground Contacts: Ensure the miniature coaxial ClickLoc connector junction does not touch the metal walls of the junction box or conduit fittings. Wrap the connected union with self-fusing silicone tape to prevent electrical noise loop interference.
• Conduit Protection Routing: Because this model lacks a flexible stainless steel armor sleeve, the raw coaxial lead wire must be fully routed within dedicated, rigid or flexible liquid-tight conduit or protective junction boxes to shield it from mechanical damage, sharp metal edges, and high electromagnetic fields (EMI).