Description

Designed specifically for machinery with critical space constraints, the Bently Nevada 330901-00-15-05-02-00 is a high-precision, non-contact displacement transducer belonging to the 3300 NSv series. This proximity probe is optimized for measuring static (position) and dynamic (vibration) parameters on small-diameter shafts or target areas where standard 5mm or 8mm probe systems cannot be physically accommodated. Operating on eddy current principles, it delivers sub-micron resolution measurements vital for assessing turbomachinery health, fluid-film bearing performance, and radial shaft vibration.

Features

• Compact Physical Footprint: Designed for tight installation geometries, featuring a 3/8-24 UNF thread profile.
• Optimized Case Configuration: Built with a 0.0-inch unthreaded length and a 1.5-inch overall case length for precise, low-clearance positioning.
• Integrated 0.5-Meter Cable: Pre-installed with a 20-inch (0.5m) standard coaxial cable for clean routing to the system extension cable.
• Coaxial ClickLoc Connector: Equipped with a miniature ClickLoc coaxial termination that prevents accidental disconnection under heavy vibrational loads.
• High-Resolution Signal Response: Optimized for small targets, delivering a linear output when paired with a compatible 3300 NSv Proximitor Sensor.

Applications

• Radial vibration and axial thrust position monitoring in small-scale steam and gas turbines.
• Fluid-film bearing clearance analysis in high-speed centrifugal compressors and turbochargers.
• Rotordynamic diagnostics on industrial pumps, fans, and auxiliary balance-of-plant machinery.
• Shaft centerline and orbit tracking inside compact machinery housings.

Ordering Information

Technical Specifications Table

Connections and Interfaces

The probe uses a miniature coaxial connection. Below is the installation routing configuration for integration into a machine monitoring loop:

Alternative Models & Compatibility

The 3300 NSv (Narrow System vibration) product line is specifically engineered for tight targets. It is crucial to note that 3300 NSv probes are not electrically compatible with standard 3300 XL 5mm, 8mm, or 11mm Proximitor sensors. Using a non-NSv sensor with this probe will result in severe scale factor errors. Always pair the 330901 probe with the designated 3300 NSv Proximitor Sensor (e.g., Series 330980).

Application Pitfalls & Engineering Notes

Due to the small physical size of the 3300 NSv probe tip, the RF field is highly concentrated. If the target shaft diameter is less than 50 mm (2.0 inches), target curvature effects will distort the linear range. Additionally, ensure that adjacent structural metals (such as bearing housings or locknuts) are kept at a minimum distance of three probe tip diameters away from the center of the probe tip to prevent side-loading errors and signal attenuation.

Commissioning & Wiring Tips

When routing the probe cable through conduit, do not pull directly on the ClickLoc connector, as this will damage the miniature crimp joints inside. Always use a connector protector tool. For harsh environments with oil or steam exposure, ensure that connection joints are insulated with self-fusing silicone tape or a connector protector kit to prevent fluid intrusion, which degrades coaxial impedance.

Installation Guidelines

1. 1 Mount the Bracket & Verify Clearance: Thread the probe into the mounting bracket or casing tapped hole manually. Ensure no cross-threading occurs during insertion.
2. 2 Gap the Probe: Connect a digital voltmeter to the Proximitor sensor's "OUT" and "COM" terminals. Adjust the probe depth until the output voltage matches your target dynamic center point (typically -10.0 Vdc for standard linear mid-point).
3. 3 Secure the Locknut: Hold the probe body stationary with a wrench and tighten the locknut to the recommended torque of 11 N-m (100 in-lb). Re-verify that the gap voltage did not drift during final tightening.