Bently Nevada 330901-00-12-05-02-05 3300 NSv Proximity Probe

Description

330901-00-12-05-02-05: This 3300 NSv proximity probe configuration is defined by a fully threaded 1/4-28 UNF-2A steel casing without external armor, featuring an Option 00 unthreaded length of 0.0 inches, an Option 12 case length of 1.2 inches, and an Option 05 total probe length of 0.5 meters (20 inches). It belongs to the 3300 XL NSv Transducer System, which is engineered for non-contact shaft vibration and axial position measurements in machinery configurations with limited target areas or tight mechanical clearances.

This specific variant pairs standard unarmored 75 ohm coaxial cable with a miniature female coaxial ClickLoc connector (Option 02) and is supplied with the Option 05 multiple agency approval package for hazardous areas. The 3300 NSv probe operates on eddy-current technology, providing a scale factor equivalent to standard transducers while maintaining a highly compact form factor to prevent cross-talk and side-view interference in small-bore mechanical components.

Features

• Fully Threaded Body: Option 00 unthreaded length allows flush casing mounting directly into the machinery tap.
• Compact 1.2-Inch Case: Option 12 provides a 1.2-inch overall case length suitable for tight internal clearance profiles.
• Short Lead Configuration: Option 05 total probe length of 0.5 meters enables clean, direct routing to the extension cable connection.
• Standard Unarmored Cable: Option 02 supplies a 75 ohm unarmored FEP-insulated coaxial cable terminated with a miniature female ClickLoc connector.
• Hazardous Area Rating: Option 05 delivers multiple global certifications (CSA, ATEX, IECEx) for intrinsically safe and non-incendive zones.
• Tight Target Optimization: Designed specifically for shaft diameters smaller than 13 mm (0.5 in) and counterbore clearances down to 9.5 mm (0.375 in).

Applications

• Shaft dynamic vibration and axial position measurement on small-bore rotating machinery.
• Aeroderivative gas turbine casing penetrations and high-speed turbine assemblies.
• Centrifugal compressors and pumps with limited radial and axial clearance.
• Fluid-film bearing monitoring in tight-clearance mechanical spaces.

Ordering Information

Technical Specifications

Installation Guidelines

• Mounting Torque: Recommended mounting torque for the 1/4-28 UNF case is 5.1 N m (45 in lb). Do not exceed the maximum rated torque of 7.3 N m (65 in lb) to prevent thread binding or casing damage.
• Target Diameter Limits: Maintain a minimum flat target diameter of 8.9 mm (0.35 in) and a recommended minimum of 13 mm (0.5 in) to ensure accurate scale factor calibration.
• Tip Separation: Maintain a separation of at least 25 mm (1.0 in) for axial position probes or 23 mm (0.9 in) for radial vibration probes to prevent electromagnetic cross-talk.
• Connector Care: Hand-tighten coaxial ClickLoc connectors. It is highly recommended to protect connections with connector protectors or silicone tape to shield from turbine oils and moisture.

Compliance and Certifications

• EMC Directive: 2014/30/EU (EN 61000-6-2 and EN 61000-6-4)
• RoHS Directive: 2011/65/EU (EFUP 15 years per SJ/T 11364-2024)
• Functional Safety: SIL 2 (HFT=0) and SIL 3 (HFT=1) certified
• Hazardous Areas: Intrinsically safe (ia) and non-incendive (nA, ec) multiple approvals under ATEX, IECEx, and CSA standards