Product Overview

The 330902-36-89-05-01 is a specialized Narrow Side View (NSv) eddy current proximity sensor from the Bently Nevada 3300 series. This transducer is engineered for high-precision displacement sensing in industrial machinery where standard 8 mm probes cannot be used due to physical obstructions or "side-view" magnetic interference. By converting the gap between the probe tip and a conductive shaft into a proportional voltage signal, it provides critical data for radial vibration and axial position monitoring. This specific configuration features an extended 8.9-inch case with 3.6 inches of unthreaded length, making it ideal for deep-reach installations in centrifugal compressors and high-speed turbines.

Technical Configuration

The model number 330902-36-89-05-01 defines a specific hardware profile optimized for restricted-space applications:

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

• Unthreaded Length: 3.6 inches

• Overall Case Length: 8.9 inches

• Total System Length: 0.5 Meters (approx. 20 inches)

• Connector Type: Miniature coaxial ClickLoc connector with protector (01 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 a compatible 3300 NSv Proximitor

Engineering for Restricted Spaces

The 3300 NSv series is designed to overcome the physical and electromagnetic limitations of standard proximity systems:

• Restricted Clearance Accuracy: The probe tip is uniquely shielded to ignore surrounding conductive material, allowing for accurate measurements on shafts smaller than 51 mm (2 inches) or inside small counterbores.

• Stainless Steel Armor: The FEP-insulated coaxial lead is protected by a flexible 304 stainless steel armor sleeve, shielding the internal wiring from mechanical abrasion, crushing, and harsh process fluids.

• Hermetic Reliability: Utilizing the patented TipLoc process, the PPS probe tip is chemically bonded to the stainless steel body. This creates a vacuum-tight seal that prevents oil or moisture from wicking into the sensing coil.

• Secure Connectivity: The gold-plated ClickLoc connector features an audible locking mechanism to prevent unintended disconnection under high vibration, while the included protector shields the junction from environmental contaminants.

Industrial Applications and Compliance

The 330902-36-89-05-01 is a foundational element for machinery health and safety systems:

• Turbine Supervisory Instrumentation (TSI): Essential for monitoring shaft dynamic motion in fluid-film bearings on centrifugal compressors and refrigeration units.

• Asset Protection: Supports predictive maintenance by providing early detection of rotor imbalance, thrust bearing wear, or thermal growth.

• Total Interchangeability: All components of the 3300 NSv system of the same length are interchangeable without manual bench calibration, simplifying field maintenance and inventory management.

• Hazardous Area Readiness: Fully certified for deployment in Zone 0, 1, and 2 environments globally, ensuring compliance with international safety standards for oil, gas, and power generation sectors.