Description
The Bently Nevada 330108-91-05 is a high-precision eddy current proximity probe designed for continuous measurement of shaft displacement and vibration in rotating machinery.
As part of the proven 3300/XL Proximity Transducer System, this probe converts minute mechanical movements into a stable analog voltage signal, enabling accurate condition monitoring, protection, and predictive maintenance of critical assets.
BENTLY 330108-91-05
Key Functions
- Non-contact measurement of shaft radial vibration
- Axial position and displacement monitoring
- Continuous gap voltage output for condition monitoring systems
- Early detection of imbalance, misalignment, bearing wear, and mechanical instability
Technical Specifications (Typical)
Mechanical Characteristics
- Probe Diameter: 8 mm
- Probe Housing: Stainless steel, corrosion-resistant
- Mounting Thread: Standard industrial thread for rigid installation
- Cable Length: 5 meters (integral probe cable)
- Cable Insulation: High-temperature fluoropolymer (PTFE class)
Electrical & Measurement Performance
- Measurement Principle: Eddy current displacement sensing
- Linear Measurement Range: Up to 2.5 mm (typical calibrated range)
- Sensitivity: Approximately 7.87 V/mm (200 mV/mil)
- Frequency Response: DC to 10 kHz
- Output Signal: Analog voltage proportional to target distance
- Target Material: Ferromagnetic steel shaft surface
Environmental Ratings
- Operating Temperature Range: −54 °C to +177 °C
- Vibration Resistance: Designed for high-vibration rotating equipment
- Environmental Suitability: Harsh industrial and continuous-duty operation
BENTLY 330108-91-05
System Compatibility
The 330108-91-05 proximity probe is designed to operate as part of a complete Bently Nevada 3300/XL transducer system, including:
- Proximity probe
- Extension cable (if applicable)
- Proximitor® signal conditioner
- 3300 or 3500 series monitoring modules
Proper system matching ensures signal linearity, calibration accuracy, and long-term measurement stability.
Typical Applications
Power Generation
- Steam turbines
- Gas turbines
- Generators
- Exciters and auxiliary rotating equipment
Oil & Gas
- Centrifugal compressors
- Pipeline pumps
- Offshore rotating machinery
Industrial Plants
- Large motors
- Fans and blowers
- Critical process pumps
In these applications, the probe delivers real-time displacement data that feeds machine protection systems, vibration monitors, and plant DCS or asset management platforms.
Installation Guidelines
- Install the probe perpendicular to the shaft surface to ensure linear response
- Maintain the recommended initial gap during commissioning
- Route probe cables separately from high-voltage or power cables
- Ground cable shielding at one end only to minimize electrical noise
- Ensure rigid mounting to prevent mechanical resonance
Correct installation is essential to achieve full measurement accuracy and system reliability.
Operational Advantages
- Non-contact measurement eliminates mechanical wear
- High signal stability over wide temperature ranges
- Long service life in continuous operation
- Accurate low-frequency and static displacement measurement
- Seamless integration with machinery protection systems
BENTLY 330108-91-05
Maintenance & Reliability
The 330108-91-05 probe requires minimal maintenance under normal operating conditions. Periodic inspection should include:
- Verification of probe gap
- Visual inspection of cable insulation
- Connector integrity checks
- Signal stability verification during scheduled outages
When installed and operated correctly, the probe provides years of reliable service without recalibration.
Origin & Manufacturing
- Brand: Bently Nevada
- Manufacturing Origin: United States
- Quality Standard: Industrial-grade manufacturing with strict performance tolerances
Summary
The Bently Nevada 330108-91-05 is a precision proximity probe engineered for accurate, stable, and long-term monitoring of shaft displacement and vibration. Its robust mechanical design, wide operating temperature range, and proven eddy current sensing technology make it a trusted solution for protecting high-value rotating machinery and supporting predictive maintenance strategies in critical industrial environments.
