Description

The Bently Nevada 330101-00-12-90-02-00 is an unarmored, threaded 8 mm proximity probe belonging to the high-performance 3300 XL 8 mm Proximity Transducer System family. It is engineered to perform non-contact shaft vibration and displacement measurements in critical rotating machinery. By employing the eddy-current operating principle, this probe continuously monitors dynamic shaft vibration and static shaft position relative to its fluid-film bearings, feeding crucial signal data into machinery protection and turbine supervisory instrumentation (TSI) systems.

This specific configuration features an integrated total length of 9.0 meters (29.5 feet). Unlike standard proximity probe configurations that rely on a separate extension cable, this 9-meter integrated cable connects directly to a 9-meter Proximitor Sensor (such as the 330180 series). This direct-connect layout eliminates the intermediate connector-to-connector junction, which significantly lowers system capacitance variances, improves signal integrity, and reduces potential failure points within hot or oil-swept machinery casings. The probe body features a standard 3/8-24 UNF thread with a fully threaded case length of 1.2 inches and no unthreaded section (0.0 inches unthreaded length), optimizing installation stability and mechanical thread engagement on bearing housings.

Features

• Standard 8 mm tip diameter optimized for non-contact eddy-current displacement and vibration tracking.
• Fully threaded 1.2-inch case with 0.0-inch unthreaded length maximizes contact area within the mounting bore.
• Direct-connect 9.0-meter integrated cable length eliminates intermediate extension cables for cleaner and more reliable installations.
• Robust polyphenylene sulfide (PPS) tip material molded with thick encapsulation to withstand harsh machine environments.
• AISI 303 stainless steel threaded probe case offers outstanding resistance to corrosion and mechanical wear.
• Miniature coaxial ClickLoc connector provides a secure, snap-locking connection directly to the Proximitor.

Applications

The 3300 XL series is widely deployed in heavy-industry machinery monitoring applications. Typical scenarios for this specific configuration include:

• Steam and gas turbine shaft vibration and axial displacement monitoring.
• Centrifugal compressor rotor displacement and axial thrust tracking.
• Boiler feed pump radial vibration measurement and speed sensing.
• Generator bearing casing displacement monitoring.
• Critical rotating equipment protection where space constraints prevent the use of bulky connector protectors.

Ordering Information

This configuration represents a specific combination of the 3300 XL 8 mm Proximity Probe family. The table below details the options configured for this part number:

Technical Specifications

Installation Guidelines

To ensure optimal system performance and long-term reliability of your 3300 XL 8 mm proximity probe, observe the following engineering recommendations:

• Gap Adjustment: Mount the probe with the appropriate probe gap (typically 1.27 mm or 50 mils) corresponding to the linear range calibration of your specific 3300 XL Proximitor sensor.
• Thread Torque: Do not exceed the maximum rated torque for standard 3/8-24 UNF forward-mounted probes, which is 33.9 N-m (300 in-lbf). Recommended tightening torque is 11.2 N-m (100 in-lbf) under normal installation conditions.
• Thread Engagement: Maintain thread engagement within the standard limits (maximum 0.563 inches for 3/8-24 UNF cases) to prevent binding or mechanical stress on the probe body.
• Cable Routing: Carefully route the triaxial FEP cable. Observe the minimum cable bend radius of 25.4 mm (1.0 inch). Keep the cable away from hot machine surfaces or sharp edges to avoid insulation damage.
• Grounding & Shielding: Connect the probe coax shields correctly. Shielding integrity must be maintained from the probe click connector through to the machinery monitoring rack I/O module.