Description

The Bently Nevada 330101-16-28-10-12-05 is a high-precision 8 mm proximity probe designed to serve as a key sensing element within the Bently Nevada 3300 XL machinery protection and condition monitoring framework. This specific configuration features a 1.6-inch unthreaded case length and a 2.8-inch overall threaded case length with standard 3/8-24 UNF threads, built without mechanical protective armor. A key differentiator for this configuration is the integration of a 1.0-meter FluidLoc cable terminated with a miniature coaxial ClickLoc connector. The patented FluidLoc technology incorporates an internal seal that prevents process fluids, lubrication oils, or moisture from leaking out of the machinery housing through the cable's interior core, making it highly effective for applications where the probe or lead is continuously exposed to pressurized oil or high condensation. This module also includes option 05, providing comprehensive certifications for ATEX, IECEx, and CSA hazardous area classifications.

As an eddy-current transducer, the probe operates by establishing an RF field at the tip. When a conductive metal target, such as a machine shaft, moves within the linear range of the probe, the target's eddy currents change the sensor's impedance. This distance-proportional signal is sent through the extension cable to a 3300 XL Proximitor sensor, providing high-fidelity measurement of dynamic shaft vibration, axial thrust position, or rotational speed for critical rotating machinery protection.

Features

• 8 mm probe tip diameter optimized for non-contact displacement and vibration measurements
• FluidLoc cable option prevents machine oil and other process liquids from migrating along the core of the cable
• Gold-plated miniature coaxial ClickLoc connector provides secure electrical connection without requiring specialized tooling
• Integral Viton O-ring provides a durable pressure seal between the probe tip and the mechanical case
• Unarmored design with standard 3/8-24 UNF brass threaded casing
• Fully compatible with 3300 XL Proximitor sensors, 3300 XL extension cables, and the 3500 monitoring platform

Applications

This proximity probe is used for heavy-duty industrial rotating machinery protection across power generation, oil and gas, and petrochemical sectors. Common applications include:

• Steam turbine rotor vibration and axial thrust wear monitoring
• Gas turbine bearing vibration and shaft position tracking
• Centrifugal compressor shaft displacement and casing thermal expansion analysis
• High-pressure water pump and fan shaft motion measurement
• Oil-filled bearing housings and submerged environments requiring FluidLoc cable containment

Ordering Information

Technical Specifications

Installation Guidelines

To ensure optimal sensor linearity and system accuracy, adhere to the following installation parameters:

• Verify that the unthreaded length of 1.6 inches matches bearing housing geometry to prevent casing interference while maintaining rigid support.
• Ensure standard thread engagement does not exceed 0.563 inches (14.3 mm) for standard 3/8-24 UNF threads to avoid binding during mounting.
• Adjust probe spacing to set the nominal gap (typically 1.27 mm / 50 mils) corresponding to the center of the calibrated linear range prior to locking the mounting nut.
• Secure the probe casing lock nut using safety wire holes to prevent loosening under heavy machine vibration.
• Route the FluidLoc cable using proper routing and grounding techniques to maintain electromagnetic shielding and connection security.

Compliance and Certifications

This module is certified for safe operation in explosive and hazardous environments under the following agency parameters:

• ATEX/IECEx: Ex ia IIC T5...T1 Ga; Ex ia IIIC T90 degC...T280 degC Dc
• CSA/cNRTLUs: Intrinsic Safety (ia) and Non-incendive (nA, ec) installations
• Entity Parameters: Ui = -28 V, Ii = 140 mA, Pi = 0.91 W, Ci = 1.5 nF, Li = 610 uH