Description

The Bently Nevada 330101-08-20-12-05 is a high-accuracy, non-contact 8 mm proximity probe designed as a core component of the 3300 XL Machinery Protection and Condition Monitoring System. This specific variant is uniquely configured with a 0.8-inch unthreaded length, a 2.0-inch overall threaded case length, an unarmored FluidLoc coaxial cable terminated with a miniature ClickLoc connector, and CSA, ATEX, and IECEx certifications for hazardous environments. The FluidLoc cable configuration is engineered to block moisture, oil, or chemical process fluids from migrating along the internal cable core, offering superior sealing in demanding machine environments compared to standard coaxial cables.

Operating on the eddy-current principle, this probe measures static and dynamic distance between the probe tip and the target shaft. This enables continuous monitoring of radial vibration, axial position, and rotor displacement on critical industrial assets. It is fully compatible with the Bently Nevada 330180 Proximitor sensor series, providing a linear electrical output directly proportional to shaft movement.

Features

• Constructed with a rugged polyphenylene sulfide (PPS) tip and a corrosion-resistant stainless steel body for high thermal stability.
• Specially engineered FluidLoc cable prevents fluid migration through the internal gaps of the cable jacket.
• Unarmored design with standard 3/8-24 UNF threads allows for direct, compact installation in machine housings and bearing caps.
• Equipped with a miniature ClickLoc coaxial connector to ensure reliable, tool-free locking connections.
• Supplied with hazardous area approvals (option code 05), permitting installation in intrinsically safe locations worldwide.
• Provides excellent linearity and stable temperature performance for highly accurate displacement measurements.

Applications

This proximity probe is typically deployed on rotating machinery across oil and gas, petrochemical, power generation, and water treatment industries. Common applications include:

• Continuous radial shaft vibration monitoring in steam and gas turbines.
• Axial thrust position measurement on high-speed centrifugal compressors.
• Shaft displacement tracking on process pumps and cooling tower fans.
• Critical rotating machinery protection and diagnostics via 3500 series monitoring racks.

Ordering Information

The part number 330101-08-20-12-05 represents a specific physical and electrical configuration of the 3300 XL 8 mm probe series. Below is the technical breakdown of each segment derived from the manufacturer documentation:

Technical Specifications

Installation Guidelines

To achieve reliable, long-term vibration measurements, follow these engineering practices during installation:

• Verify that the physical probe gap is calibrated within the linear range of the corresponding Proximitor sensor (typically set near the -10.0 VDC point, corresponding to a 1.0 mm or 50 mils physical gap).
• Utilize a calibrated digital voltmeter to verify output voltage while adjusting the probe depth prior to tightening the lock nuts.
• Avoid over-tightening the probe within the mounting threads; observe standard torque limits for 3/8-24 UNF steel casings.
• Route the FluidLoc cable carefully to maintain minimum bend radius requirements and avoid routing near high-voltage lines.
• Ensure proper electrical isolation, shield termination, and grounding of the coaxial line inside the transducer junction box.