Description

The Bently Nevada 330101-00-20-50-02-05 is a high-precision 8 mm proximity probe belonging to the 3300 XL 8 mm Proximity Transducer System. This non-contact sensor is specifically designed to measure shaft vibration, axial position, and rotor displacement on critical rotating machinery. By utilizing eddy-current technology, it translates the physical distance between the probe tip and the target shaft into an electrical signal, enabling real-time condition monitoring and machinery protection in steam turbines, gas turbines, compressors, and high-pressure pumps.

This particular configuration features a 3/8-24 UNF thread case without armor, providing robust mounting in space-constrained industrial installations. Engineered with no unthreaded length (0.0 in) and an overall case length of 2.0 in, the probe is fully threaded for maximum mounting flexibility. With a 5.0 m total cable length on a standard coaxial cable, this probe connects directly to a 5-meter Proximitor sensor (such as the 330180 series) without needing an intermediate extension cable. It comes equipped with a miniature coaxial ClickLoc connector and holds CSA, ATEX, and IECEx approvals for safe operation in hazardous environments.

Features

• Eddy-current operating principle for non-contact, high-accuracy displacement and vibration measurements.
• Rugged polyphenylene sulfide (PPS) probe tip and stainless steel body designed for demanding industrial machine environments.
• Fully threaded 3/8-24 UNF body with zero unthreaded length (0.0 in) to fit shallow bearing housings.
• Direct 5.0-meter cable length simplifies system topology by connecting directly to the Proximitor sensor without an extension cable.
• Gold-plated ClickLoc miniature coaxial connector provides a reliable, secure connection with positive tactile feedback.
• Integrated Viton O-ring provides a durable differential pressure seal between the probe tip and case.

Applications

• Turbine shaft vibration and radial dynamic monitoring in power generation plants.
• Rotor axial position and thrust displacement measurement in centrifugal compressors and high-speed pumps.
• Eccentricity and oil film thickness monitoring in fluid-film bearings.
• Direct replacement and permanent machine casing integration for heavy-duty industrial rotating machinery.

Ordering Information

Technical Specifications

Installation Guidelines

Ensure that the 330101 proximity probe is installed with the appropriate physical gap between the target shaft and the probe tip, as specified in your calibration documentation (typically 1.27 mm or 50 mils for standard 4140 steel calibration target). Secure the probe case firmly into the machine casing or mounting bracket. Route the 5.0-meter cable with appropriate bend radii and protect it against abrasive contact. The ClickLoc connector should be tightened to finger-tight pressure to prevent damage. Implement proper shielding and grounding practices to avoid electrical noise interference in the vibration monitoring signal path.

Compliance and Certifications

The 330101-00-20-50-02-05 probe is certified for use in hazardous areas under option 05. This includes key approvals from CSA, ATEX, and IECEx, enabling installation in intrinsically safe (Zone 0/Class I, Div 1) and non-incendive (Zone 2/Class I, Div 2) locations when connected per Bently Nevada drawing 141092 or 140979 with matching entity parameters.