Bently Nevada 330101-38-49-20-02-05 3300 XL 8 mm Probe, 3/8-24 UNF Thread

Product Overview

The Bently Nevada 330101-38-49-20-02-05 is a 3300 XL 8 mm Probe designed for non-contact vibration and position measurement. It features a 3/8-24 UNF thread and is supplied without armor. This probe is part of the proven 3300 XL series, known for its rugged construction and reliable performance in demanding industrial applications. The probe incorporates patented TipLoc and CableLoc technologies, providing a more robust bond between the probe tip and body, and offering 330 N (75 lbf) pull strength for secure cable attachment. The 8 mm probe design provides a thicker encapsulation of the probe coil in molded PPS plastic, resulting in enhanced durability.

Technical Specifications Breakdown

Key parameters for the 330101-38-49-20-02-05 are listed below for quick reference:

Industry Applications

This 3300 XL probe is ideally suited for monitoring radial vibration and axial position in critical rotating machinery such as steam turbines, compressors, pumps, and electric motors. Its 2 mm linear range and high sensitivity (7.87 V/mm) make it effective for detecting subtle changes in shaft dynamics that could indicate developing faults like imbalance, misalignment, or bearing wear. The CSA, ATEX, and IECEx approvals allow installation in hazardous areas, expanding its use to oil and gas, petrochemical, and power generation facilities. By providing early warning of mechanical issues, the probe helps operators avoid catastrophic failures and reduce maintenance costs through condition-based maintenance strategies.

Installation & Setup Guidance

When installing the 330101-38-49-20-02-05, ensure the probe is mounted securely using the 3/8-24 UNF thread. The recommended torque for standard forward mounted probes is 11.2 N•m (100 in•lbf), with a maximum rated torque of 33.9 N•m (300 in•lbf). For the first three threads of standard forward mount probes, the recommended torque is 7.5 N•m (66 in•lbf) and the maximum is 22.6 N•m (200 in•lbf). The recommended gap setting for radial vibration is -9 Vdc, approximately 1.27 mm (50 mils). Use field wiring of 0.2 to 1.5 mm² (16 to 24 AWG) with a 3 conductor shielded triad cable, keeping the maximum length between the Proximitor Sensor and monitor at 305 meters (1,000 feet).

Maintenance & Reliability

Regular inspection of the probe and cable is recommended to ensure reliable operation. The probe is designed to seal differential pressure between the probe tip and case using a Viton O-ring. Avoid exposing the probe to temperatures below –34°C (–30°F) to prevent premature failure of the pressure seal. The probe's relative humidity performance shows less than a 3% change in Average Scale Factor (ASF) when tested in 93% humidity per IEC standard 68 2 3 for up to 56 days. For extended temperature range applications, the probe tip can operate from -52°C to +218°C (-62°F to +425°F), with the cable and connector rated from -51°C to +260°C (-60°F to +500°F).

The Evolution of Precision Vibration Monitoring

Industrial machinery protection has evolved dramatically over the past decades, transitioning from simple mechanical switches to sophisticated electronic sensors that provide real-time data on machine health. The Bently Nevada 330101-38-49-20-02-05 represents a key milestone in this evolution, offering engineers a reliable, solution for measuring shaft vibration and position in critical rotating equipment. This 3300 XL 8 mm Probe, with its 3/8-24 UNF thread and robust design, is built to withstand harsh environments while delivering consistent, accurate readings that help prevent costly unplanned downtime.

Selection Guide & Purchasing Advice

When selecting a replacement or new probe, verify that the part number 330101-38-49-20-02-05 matches your system requirements. This probe is designed for use with Bently Nevada 3300 XL Proximitor sensors and monitors. AutoDCSTech offers this exact model with full traceability and support. Please verify current lifecycle status and availability with AutoDCSTech before ordering.