Bently Nevada 21504-12-28-10-02 7200 Series 8 mm Standard Mount Proximity Probe

Description

21504-12-28-10-02 specifies this 7200 Series 8 mm Standard Mount Proximity Probe configuration, featuring a 3/8-24 UNF-2A thread, 1.2 inches of unthreaded length, 2.8 inches of overall case length, a 1.0-meter integral coaxial cable, and a miniature male coaxial connector.

Unlike the armored 21505 probe series, this 21504 model does not feature stainless steel lead armor, making it suitable for routing inside conduit or protective machinery enclosures where mechanical abrasion risks are minimal. Additionally, its 1.2-inch unthreaded length (Option 12) combined with the 2.8-inch case length (Option 28) leaves a threaded length of 1.6 inches for bracket depth adjustment, supporting proper gap calibration with the target surface.

Features

• 8 mm tip diameter constructed of polyphenylene sulfide (PPS) plastic to withstand harsh, wet, or chemical environments.
• 3/8-24 UNF-2A English thread configuration for robust standard-mount installations.
• 1.2 inches (30.5 mm) unthreaded length (Option 12) to accommodate specific bracket recess depths.
• 2.8 inches (71.1 mm) overall case length (Option 28) providing 1.6 inches of threaded casing.
• 1.0-meter (39 inches) integral 95-ohm coaxial cable length (Option 10) for direct connection to an extension cable.
• Miniature male coaxial connector (Option 02) designed for low-impedance signal transmission.
• Non-armored design for installations where external conduit protection is already provided.

Applications

• Radial shaft vibration measurement for evaluating fluid-film bearing condition, rotor imbalance, and misalignment.
• Axial shaft position monitoring to detect thrust bearing wear or potential machine failure.
• Shaft average radial position determination for indicating attitude angle and rotor stability.
• Vibration amplitude and phase angle acquisition for Polar and Bode diagnostic plots.
• Rotor eccentricity measurement to evaluate shaft bow prior to machine startup.

Ordering Information

Technical Specifications

Connections and Interfaces

This proximity probe is equipped with an integral 1.0-meter 95-ohm coaxial cable terminated with a miniature male coaxial connector. It connects directly to a 7200 Series extension cable to establish a total system length of either 5 or 9 meters back to the Proximitor Sensor.

Installation Guidelines

• Ensure the unthreaded length (1.2 inches) is at least 0.8 inches less than the overall case length (2.8 inches). This configuration provides a threaded length of 1.6 inches, meeting the clearance requirement.
• Use a standard thread jam nut to secure the standard-mount probe in place once final gapping is achieved.
• Adjust the gap to the center of the calibrated linear range (typically 50 mils or 1.27 mm) to achieve optimal vibration and position measurement.
• Ensure connection points are clean and dry. Use protective sleeves where connections are exposed to industrial fluids.
• Do not exceed the minimum bend radius of the coaxial cable during routing.

Compliance and Certifications

Most Bently Nevada 7200 Series proximity transducers are certified by major regulatory bodies (including CSA, BASEEFA, and FM) for use in hazardous environments. For detailed installation wiring diagrams and intrinsic safety parameters, consult the official Bently Nevada systems for hazardous locations documentation.