Product Overview

The Bently Nevada 128276-011 is a high-performance eddy current proximity probe designed for non-contact measurement of shaft displacement, vibration, and eccentricity. It is part of the Bently Nevada family of sensors used in the 3500 and other monitoring systems. The probe generates a low-power radio frequency field that interacts with the target shaft, producing a signal proportional to the gap. This signal is conditioned by a Proximitor to provide a DC voltage for monitoring and protection.

Key Features

• 5mm or 8mm tip diameter options (specific to model)

• Linear measurement range up to 2.0 mm (80 mils)

• Integrated cable with optional armor for harsh environments

• Temperature compensated for stable operation

• Intrinsically safe versions available for hazardous areas

• Compatible with Bently Nevada Proximitors and monitors

Technical Specifications

• Model: 128276-011

• Tip Diameter: 8 mm

• Linear Range: 0.25 to 2.3 mm (10 to 90 mils)

• Sensitivity: 7.87 V/mm (200 mV/mil) nominal

• Frequency Response: 0 to 10 kHz

• Temperature Range: -35°C to +175°C (probe tip)

• Output Signal: To Proximitor (RF modulated)

• Housing Material: Stainless steel

• Approvals: ATEX, IECEx, CSA (depending on version)

Applications

This probe is extensively used on turbines, compressors, generators, and large pumps where shaft relative vibration and position must be monitored. It provides essential data for rotor dynamics analysis, thrust bearing wear detection, and overspeed protection.

Benefits

The 128276-011 offers high accuracy and repeatability, ensuring reliable protection for critical machinery. Its rugged construction withstands extreme temperatures and contaminants. By integrating with the 3500 monitoring system, it enables seamless data acquisition and alarm management.

Conclusion

The Bently Nevada 128276-011 proximity probe is an industry standard for shaft measurement. Its precision and durability make it indispensable for comprehensive machinery protection programs.