Description

The Bently Nevada 330101-00-25-05-02-05 is a high-performance 8 mm proximity probe belonging to the industry-standard 3300 XL 8 mm Proximity Transducer System. This specific configuration is distinguished by a fully threaded 3/8-24 UNF steel case (0.0 inches of unthreaded length) and a 2.5-inch overall case length. It features a short 0.5-meter (1.6-foot) standard coaxial cable terminated with a miniature gold-plated ClickLoc connector, and comes fully certified with CSA, ATEX, and IECEx hazardous area approvals. Unlike armored variants, this model features a standard unjacketed cable, making it ideal for standard routing within protective conduits or direct bearing housing installations.

This non-contacting sensor uses eddy-current technology to deliver precise, high-resolution measurements of static position and dynamic vibration. It is designed to pair seamlessly with a 3300 XL Proximitor sensor (such as the 330180 series) and a standard extension cable to form a complete 5-meter or 9-meter transducer chain. Highly ruggedized with a polyphenylene sulfide (PPS) tip and a stainless steel body, this probe provides critical shaft displacement data for steam turbines, gas turbines, compressors, and pump rotors, ensuring reliable machinery protection and preventing catastrophic failures.

Features

• Non-contacting eddy-current technology for high-precision vibration and shaft position measurements.
• Ruggedized PPS plastic tip and stainless steel case body designed for long-term permanent mounting in demanding industrial environments.
• Fully threaded 3/8-24 UNF body configuration with no unthreaded section (0.0 inches), providing maximum mounting flexibility.
• Short 0.5-meter total probe length, optimizing the layout of localized junction box terminations.
• Gold-plated ClickLoc miniature coaxial connector ensures a secure, vibration-resistant connection to extension cables.
• Certified with comprehensive multi-agency hazardous area approvals (-05 option), including CSA, ATEX, and IECEx.

Applications

• Steam and gas turbine shaft vibration and axial displacement monitoring.
• Centrifugal compressor and expander rotor thrust and radial position sensing.
• Critical industrial pump and cooling tower fan bearing housing protection.
• Permanent machine casing installations requiring high-accuracy non-contacting displacement measurement.

Ordering Information

Technical Specifications

Connections and Interfaces

The 330101-00-25-05-02-05 probe is terminated with a gold-plated miniature coaxial ClickLoc connector. This connector provides a robust mechanical and electrical coupling with standard 3300 XL extension cables. It is designed to be tightened finger-tight during installation to ensure low contact resistance and to prevent vibration-induced loosening under continuous machine operation.

Installation Guidelines

To ensure high measurement accuracy and long-term mechanical reliability, follow these standard installation practices:

• Probe Gapping: Mount the probe with an appropriate physical offset from the target shaft, typically gapped to -9 Vdc (approximately 1.27 mm or 50 mils) to sit at the midpoint of the linear range.
• Thread Engagement: Thread the probe case into the bracket or housing with a maximum thread engagement of 0.563 inches to prevent case binding. Always use locking nuts to secure the probe position once gapped.
• Cable Protection: Route the coaxial cable with a minimum bend radius to prevent internal wire strain. Ensure the cable connection is protected from moisture, oil, and harsh contaminants.
• Shielding and Grounding: Maintain proper grounding at the monitor rack while isolating the probe body at the machine casing to avoid electrical interference and ground loops.

Compliance and Certifications

Equipped with the -05 approval package, this probe meets several international standards for installation in hazardous locations:

• CSA: Class I, Division 1 and 2, Groups A, B, C, D; Class II, Groups E, F, G; Class III
• ATEX/IECEx: Intrinsically safe (Ex ia IIC T5...T1 Ga) and non-sparking/increased safety (Ex nA/ec IIC Gc) when installed per approved system drawings with zener barriers or galvanic isolators
• CE: Fully compliant with applicable European electromagnetic compatibility and machinery protection directives