Bently Nevada 21504-012-028-10-02 3300 Series Proximity Probe

Description

Engineered for high-precision, non-contact displacement and vibration measurements, the 21504-012-028-10-02 represents a dependable industrial solution for monitoring critical rotating machinery. This 8mm proximity probe operates as part of a classic eddy current transducer system, delivering continuous dynamic shaft movement data to machinery protection systems.

The sensor configuration features a standard 3/8-24 threaded body with an unthreaded section of 1.2 inches and a total case length of 2.8 inches. It includes a 1.0-meter integrated coaxial cable terminated with a miniature male coaxial connector, designed to interface seamlessly with standard extension cables and proximitor sensors. Built to survive harsh industrial environments, this probe provides consistent, linear calibration across its active measurement range.

Features

• Standard 8mm probe tip diameter for industrial machinery measurements.
• Rugged 3/8-24 UNF-2A threaded case body.
• 1.2-inch unthreaded case length option for precise mechanical standoff adjustment.
• 2.8-inch overall case length suitable for standard machine casing profiles.
• 1.0-meter flexible coaxial cable with miniature male connector.
• Non-armored lead configuration optimized for structured conduit routing.

Applications

• Steam and gas turbine shaft vibration and axial position monitoring.
• Industrial compressor and expander radial displacement detection.
• Boiler feed pump shaft dynamic movement analysis.
• Hydroelectric generator thrust bearing and oil film thickness monitoring.

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Thread Engagement & Mounting: Hand-tighten the probe into the threaded mounting hole, then lock it securely in place with a locknut once the gap distance is calibrated. Do not exceed standard torque ratings for 3/8-24 brass or stainless steel hardware.
• Target Gap Calibration: Adjust the electrical gap using a digital voltmeter connected to the Proximitor output. Calibrate to the center of the linear range (typically -10 Vdc to -12 Vdc bias voltage, representing approximately 40 to 50 mils gap).
• Side Clearance: Maintain a minimum counterbore diameter and side clearance from surrounding conductive metal parts to prevent side-viewing interference and calibration errors.
• Cable Protection: Route the coaxial cable through dynamic conduit or secure it with clamps to prevent whipping, pinching, or excessive mechanical wear in high-vibration areas.