Bently Nevada 21505-22-55-10-02 Probe Proximity Vibration Sensor 8mm

Technical Specifications Breakdown

Key parameters for the 21505-22-55-10-02 are listed below for quick reference:

Industry Applications and Failure Prevention

In steam turbines, centrifugal compressors, and large pumps, shaft vibration is a leading indicator of mechanical distress. The 21505-22-55-10-02 provides a direct voltage output proportional to shaft displacement, allowing engineers to trend changes over time. By monitoring the 0 to 10 kHz frequency range, operators can detect both low-speed runout and high-speed instabilities. The probe’s corrosion resistance to air, water, lube oil, ammonium hydroxide, sulfuric acid (10%), MEK, and DMF makes it suitable for chemical and petrochemical environments.

Installation and Setup Guidance

Mount the probe using the 3/8-24 threaded case into a rigid, non-ferrous bracket. Ensure the target shaft material is compatible with eddy current sensing (electrically conductive). The unthreaded length of 2.2 inches and overall case length of 5.5 inches allow flexibility in mounting depth. Connect the miniature male coaxial connector to the extension cable, then to a compatible Bently Nevada proximitor. Verify the initial gap is within the calibrated range (approximately 10 to 90 mils from the probe face). Power the system with -17.5 Vdc to -26 Vdc at 12 mA maximum.

Maintenance and Reliability

Periodically inspect the probe tip and lead armor for physical damage or contamination. The stainless steel armor provides robust protection in high-vibration areas. Keep the connector interfaces clean and dry. The system weight of 1.3 lbs (0.59 kg) is manageable for most mounting configurations. Environmental limits for the probe and cable range from -30°F to +350°F (-34°C to +177°C), suitable for many hot-side applications.

Precision Vibration Monitoring for Rotating Machinery

Unplanned downtime in critical rotating machinery often stems from undetected shaft vibration. The Bently Nevada 21505-22-55-10-02 is a proximity probe designed to deliver accurate, real-time displacement data, enabling early detection of issues like imbalance, misalignment, and bearing wear. This 8 mm diameter probe is part of the 7200 Proximity Transducer System and provides a calibrated range of 80 mils (2.0 mm) with a scale factor of 200 mV/mil (7.87 V/mm). Its stainless steel lead armor ensures durability in harsh industrial environments.

Selection Guide and Purchasing Advice

When selecting a proximity probe, match the total length (1.0 metre in this option) to the distance between the probe tip and the proximitor. The 21505-22-55-10-02 is available new and in original factory packing from AutoDCSTech. Each unit comes with a 12-month factory warranty. Please verify current lifecycle status and availability with AutoDCSTech before ordering.