Description

Designed for critical industrial machinery monitoring, the Bently Nevada 330101-00-25-20-12-00 is an engineering-grade 3300 XL 8 mm proximity probe featuring a 3/8-24 UNF threaded body without protective armor. This configuration is specifically engineered with an integrated FluidLoc cable (Option code 12), which prevents process oil, lubrication fluid, and gases from leaking out of the bearing housing or machinery casing through the interior of the coaxial cable. This makes it highly critical for wet, high-pressure, or oil-flooded machinery applications where traditional cables might permit fluid migration. The probe delivers reliable, non-contact measurement of static shaft position and dynamic vibration, fully integrating with standard 3300 XL monitoring systems and Proximitor sensors.

The transducer system relies on the eddy-current operating principle to supply a continuous output voltage directly proportional to the distance between the probe tip and the target shaft. Due to its backwards compatibility, this probe can be used alongside older non-XL 3300 series 5 mm and 8 mm system components, providing a highly reliable and cost-effective path for machinery monitoring upgrades.

Features

• FluidLoc coaxial cable option blocks the flow of machinery lubricants and process fluids through the cable interior.
• Gold-plated miniature male coaxial ClickLoc connector provides a secure connection that clicks when locked to prevent loosening.
• Patented TipLoc molding method ensures a robust, high-integrity bond between the polyphenylene sulfide probe tip and the stainless steel body.
• Patented CableLoc design delivers up to 330 N (75 lbf) of pull strength to prevent probe cable separation from the tip.
• Fully threaded 2.5-inch case with a thread profile of 3/8-24 UNF-2A and no external armor jacket.
• Built-in Viton O-ring seal to establish a reliable differential pressure barrier between the probe tip and the casing.

Applications

• Steam and gas turbine shaft relative vibration and axial displacement monitoring.
• Compressor and pump rotor position tracking in oil-flooded environments.
• Fluid-film bearing dynamic vibration measurement on critical turbomachinery.
• Keyphasor phase reference and rotational speed measurements on high-speed shafts.
• Machinery protection installations requiring positive leakage containment at casing penetrations.

Ordering Information

Technical Specifications

Installation Guidelines

• Mount the probe with the correct probe gap (typically calibrated to -9 Vdc or 1.27 mm / 50 mils) against an AISI 4140 steel target.
• Ensure ClickLoc coaxial connectors are completely dry and free from contaminants before joining. Hand-tighten until they click to engage the locking system.
• Do not exceed the minimum bend radius of the coaxial cable during routing to avoid signal attenuation or conductor fatigue.
• Ensure the casing penetration is properly sealed, and implement local safety measures to contain machinery fluids in case of high-pressure seal issues.