BENTLY 21508-02-12-05-02 Sensor Module

BENTLY NEVADA 21508-02-12-05-02 Sensor Module / Proximity Probe (7200 Series)

 

 

The Bently Nevada 21508-02-12-05-02 is an 8mm reverse mount proximity probe from the 7200 Series proximity transducer system, used for non-contact vibration and shaft displacement measurement in rotating machinery.

Basic Information

• Part Number: 21508-02-12-05-02
• Brand: Bently Nevada (Baker Hughes / GE legacy)
• Series: 7200 Proximity Transducer System
• Type: Proximity Probe / Sensor Module
• Function: Measures shaft vibration, position, and displacement (eddy current principle)

Technical Breakdown (Code Meaning)

Typical configuration decoding:

• 21508-02 → Probe model / 8mm reverse mount type
• 12 → Cable length option (commonly longer integral cable version depending on configuration)
• 05 → Jacket / cable material variant
• 02 → Connector type (miniature coaxial connector)

⚠️ Exact configuration can vary slightly depending on OEM production batch, but it always belongs to the 7200 8mm probe system.

Key Technical Characteristics

• Measurement Type: Eddy current (non-contact)
• Frequency Response: up to ~10 kHz range
• Measurement Function:
  • Shaft vibration
  • Axial displacement
  • Position monitoring
• System Compatibility: 7200 / 3300 compatible monitoring systems (depending setup)
• Operating Environment: Industrial turbine-grade environments
• Output: Gap voltage signal (used with proximitor sensor)

System Composition (Important)

This probe cannot work alone. It must be used with:

• Extension cable (matching system type)
• Proximitor sensor (signal conditioning module)

Together they form a complete eddy current vibration monitoring system.

Application Areas

• Steam turbines
• Gas turbines
• Compressors
• Pumps and motors
• Generators
• Gearboxes
• Petrochemical plants
• Power generation systems

Key Features

• High accuracy non-contact vibration measurement
• Stable operation under high temperature & vibration
• Designed for critical machinery protection systems
• Compatible with predictive maintenance systems
• Strong industrial durability and EMI resistance
• Standard solution for rotating equipment monitoring

Advantages

• Proven turbine-grade reliability
• Early fault detection for rotating machinery
• Stable long-term signal output
• High compatibility with legacy Bently systems
• Widely used in power plants and oil & gas industry

Precautions

• Must match correct probe + cable + proximitor system set
• Do not mix 7200 and 3300 XL system components
• Ensure correct gap calibration before operation
• Avoid cable stress near connector area
• Installation must follow OEM alignment standards