Product Overview

The 330902-00-12-10-02-05 is a specialized Narrow Side View (NSv) eddy current proximity probe manufactured by Bently Nevada. Unlike standard 8 mm probes, the NSv series is specifically engineered for machinery with severe spatial constraints, such as small shaft diameters or restricted side-view clearances where a standard probe’s magnetic field would be distorted by adjacent metal. This sensor provides high-precision, non-contacting displacement measurements, converting the distance between the probe tip and a conductive target into a linear voltage signal. It is a critical component for Turbine Supervisory Instrumentation (TSI) used to monitor radial vibration and axial position on high-speed centrifugal compressors, pumps, and aeroderivative turbines.

Technical Configuration

The specific alphanumeric configuration of the 330902-00-12-10-02-05 model defines the following technical profile:

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

• Unthreaded Body Length: 0.0 inches (Fully threaded case)

• Overall Case Length: 1.2 inches

• Total System Length: 1.0 Meter (3.3 feet)

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

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

• Linear Range: 1.5 mm (60 mils)

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

Specialized Engineering for Confined Spaces

The 3300 NSv system is designed to provide accurate data in environments where standard sensors fail due to "side-view" interference:

• Restricted Clearance Optimization: The probe tip is shielded to minimize the effects of surrounding conductive material, allowing for installation in small counterbores or on shafts with diameters as small as 50 mm (2 inches).

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

• Hermetic Integrity: Utilizing the patented TipLoc process, the probe tip is molecularly bonded to the stainless steel body to prevent oil and moisture wicking into the sensing coil.

• High-Strength Anchoring: The CableLoc design ensures an internal pull strength of 330 N (75 lbf), protecting the electrical junction from stress during installation or high-vibration operation.

Industrial Applications and Compliance

As a core element of machinery protection systems, the 330902-00-12-10-02-05 offers:

• Reliable Vibration Monitoring: Ideal for measuring shaft dynamic motion in fluid-film bearings where radial clearances are minimal.

• Total Interchangeability: Probes, extension cables, and 3300 NSv Proximitor sensors of the same system length (1m) can be swapped without manual bench calibration.

• Backward Compatibility: Electrically compatible with legacy 3300 and 7200 series 5 mm proximity systems, facilitating easy modernizations.

• Standard Compliance: Fully compliant with API 670 standards for machinery protection systems in the oil, gas, and power generation sectors.