Product Overview

The 330902-05-20-10-02-05 is a specialized Narrow Side View (NSv) eddy current proximity sensor from Bently Nevada. This model is engineered specifically for machinery with extreme spatial restrictions where standard 8 mm probes cannot be utilized due to "side-view" interference or physical counterbore limitations. It provides non-contacting displacement measurements, converting the physical gap between the probe tip and a conductive shaft into a precise linear voltage signal. This armored version is optimized for small-bore centrifugal compressors and high-speed pumps, providing essential data for radial vibration and axial position monitoring.

Technical Configuration

The model number 330902-05-20-10-02-05 specifies a high-performance hardware profile:

• Model Series: 330902 (1/4-28 UNF thread with Stainless Steel Armor)

• Unthreaded Length: 0.5 inches (05 option)

• Overall Case Length: 2.0 inches (20 option)

• Total System Length: 1.0 Meter / 3.3 Feet (10 option)

• Connector Type: Miniature coaxial ClickLoc connector (02 option)

• Agency Approvals: Multi-certified for hazardous areas including ATEX, IECEx, and CSA (05 option)

• Linear Range: 1.5 mm (60 mils)

• Scale Factor: 7.87 V/mm (200 mV/mil) when paired with 3300 NSv Proximitor

Advanced Mechanical Construction

To ensure reliability in demanding industrial environments, this NSv probe incorporates several proprietary manufacturing technologies:

• Armored Lead Protection: The FEP-insulated lead is encased in flexible 304 stainless steel armor, shielding the signal path from mechanical abrasion, fluid exposure, and accidental impact within the machine housing.

• TipLoc Molding: A molecular-level chemical bond is established between the Polyphenylene Sulfide (PPS) tip and the stainless steel body. This creates a vacuum-tight seal that prevents the wicking of oil and process fluids into the sensing coil.

• CableLoc Mechanism: This internal anchoring design provides up to 220 N (50 lb) of pull strength, ensuring the cable remains firmly attached to the probe body even under significant mechanical stress or vibration.

• Gold-Plated ClickLoc: The probe is equipped with corrosion-resistant, gold-plated brass connectors that lock with an audible click, maintaining electrical continuity without the need for specialized installation tools.

  
  

System Integration and Applications

The 330902-05-20-10-02-05 is a critical element for modern machinery protection strategies:

• Confined Space Monitoring: Ideal for monitoring shafts smaller than 51 mm (2 inches) or axial targets smaller than 15 mm (0.6 inches).

• Asset Compatibility: Widely deployed on centrifugal and refrigeration compressors, as well as aeroderivative gas turbines.

• Interchangeability: Components of the same length and series are fully interchangeable, allowing for field replacement without manual bench calibration.

• Environmental Resistance: Built to withstand the harsh conditions of oil and gas, petrochemical, and power generation facilities, with certifications for Zone 0, 1, and 2 environments.