Bently Nevada 21508-02-12-05-02 8 mm Reverse Mount Probe

Description

The 21508-02-12-05-02 is a 7200 series 8 mm reverse mount proximity probe, featuring a 0.2 inch unthreaded length (Option 02) and a 1.2 inch case length (Option 12). This configuration includes a 0.5 metre total cable length (Option 05) and is terminated with a miniature male coaxial connector (Option 02).

Used as a critical component in 7200 series transducer systems, this probe utilizes the eddy-current principle to provide non-contacting vibration and position measurements. The probe is engineered for reverse mount installation on rotating machinery, such as steam turbines, gas compressors, and large electric motors. It pairs with 7200 series Proximitor sensors and extension cables to monitor radial vibration, axial thrust position, and shaft average radial position.

Features

• 8 mm probe tip diameter for high-accuracy displacement measurement
• Reverse mount configuration with 3/8-24 UNF threads
• 0.2 inch unthreaded length and 1.2 inch case length
• 0.5 metre integral coaxial cable for compact installation
• Miniature male coaxial connector for signal transmission
• Compatible with Bently Nevada 7200 series Proximitor sensors and monitoring systems
• Constructed of polyphenylene sulfide (PPS) for chemical resistance

Applications

• Radial vibration monitoring to detect rotor imbalance and misalignment
• Axial thrust position measurements to monitor bearing wear
• Shaft average radial position for rotor stability analysis
• Eccentricity measurement to identify rotor bow
• Installation in steam turbines, gas compressors, pumps, and electric motors

Ordering Information

Technical Specifications

Installation Guidelines

Ensure the probe is installed with the correct gap distance to maintain the linear range of 80 mils (2.0 mm). Use caution when tightening the mounting nut to avoid damage to the PPS probe body. Proper grounding of the coaxial cable shield is required to prevent electrical interference. For hazardous locations, verify the installation against local safety codes and specific Bently Nevada hazardous area data sheets.