Description

The Bently Nevada 330101-32-70-05-12-05 is a high-performance, non-contacting standard 3300 XL series 8 mm proximity probe designed for eddy-current displacement measurements. It is engineered specifically for monitoring radial vibration, axial shaft position, and rotor displacement in critical rotating machinery such as steam turbines, gas turbines, compressors, and high-speed pumps. This specific configuration is highly differentiated by its unarmored standard 3/8-24 UNF threaded housing and the integrated FluidLoc cable technology, making it ideal for environments where preventing fluid migration from the bearing housing or machine interior through the coaxial cable is a critical system requirement.

This proximity probe is part of the 3300 XL 8 mm Proximity Transducer System, delivering advanced performance and full interchangeability across sensors, cables, and Proximitor modules without requiring custom bench calibration. It operates by generating a high-frequency electromagnetic field that detects static and dynamic displacement of a target, typically an AISI 4140 steel shaft, and outputs a proportional voltage signal when paired with a compatible Proximitor sensor.

Features

• Rugged 8 mm tip diameter optimized for non-contact vibration and shaft position monitoring.
• FluidLoc cable (Option 12) prevents process oils, lubes, and other fluids from leaking out of bearing housings through the cable interior.
• TipLoc molding process provides a high-integrity, robust bond between the probe tip and the stainless steel housing.
• Gold-plated miniature coaxial ClickLoc connector secures the connection with finger-tight force and audible confirmation click.
• Unthreaded probe length of 3.2 inches allows deep sleeve mounting or specific spatial alignment within the machine casing.
• Certified for hazardous environments with CSA, ATEX, and IECEx approvals.

Applications

• Radial vibration monitoring of fluid-film bearings in turbomachinery.
• Thrust (axial) position tracking to protect rotating assemblies from mechanical contact.
• Phase reference and speed sensing (Keyphasor applications) in petrochemical and power generation plants.
• Environmental barrier isolation installations where conventional cabling would lead to process fluid leaks.

Ordering Information

Technical Specifications

Installation Guidelines

• Always verify the nominal probe gap (typically 1.27 mm or 50 mils) against calibrated system parameters prior to final tightening.
• Ensure the maximum thread engagement length does not exceed 0.563 inches to prevent case binding.
• Run all probe coaxial cables with proper shielding and structural grounding to maintain low-noise transmission.
• Tighten the ClickLoc gold connectors finger-tight until an audible click is felt; do not use pliers or tooling on ClickLoc-to-ClickLoc connections.
• Ensure the FluidLoc cable is routed to prevent physical abrasion or excessive bending; maintain standard minimum bend radius during installation.

Compliance and Certifications

• ATEX/IECEx: Intrinsically Safe Ex ia IIC T5...T1 Ga for Zone 0/1; Non-Sparking Ex nA/ec IIC T5...T1 Gc for Zone 2.
• CSA: Class I, Zone 0/2; Class I, Division 1 and Division 2, Groups A, B, C, and D.
• CE: Fully compliant with electromagnetic compatibility (EMC) regulations.