Product Overview

The Bently Nevada 330710-000-060-50-02-00 is an 11 mm diameter proximity probe, specifically engineered for applications requiring a larger linear measurement range than the standard 8 mm probes can provide. Part of the 3300 XL transducer system, this sensor utilizes advanced eddy-current technology to deliver precise, non-contact measurements of shaft radial vibration, axial position, and rotor speed. The larger 11 mm probe tip offers increased sensitivity and a greater linear sensing range, which is critical for large-frame rotating machinery where shaft clearances and movement patterns exceed the limits of traditional 8 mm sensors. This transducer assembly is built for high-performance condition monitoring, ensuring continuous, high-fidelity data acquisition that supports predictive maintenance strategies and machinery protection in industrial environments.

Technical Specifications

Model Configuration Explanation

The 330710-000-060-50-02-00 part number represents a specific physical and certification configuration:

• 000: Unthreaded length (0 mm)

• 060: Overall case length (60 mm)

• 50: Total length (5.0 meters)

• 02: Connector type (Miniature coaxial)

• 00: Agency approval (Standard)

Typical Applications

The 11 mm probe is utilized in specific scenarios where the larger linear range is a necessity for accurate data capture:

• Large-Frame Steam Turbines: Monitoring rotors with higher vibration amplitudes or larger shaft diameters.

• Vertical Hydroelectric Turbines: Detecting rotor displacement where clearances are significantly wider than horizontal counterparts.

• Heavy-Duty Centrifugal Compressors: Managing axial thrust monitoring where range requirements exceed standard 80 mil specifications.

• Experimental Turbomachinery: Supporting R&D test stands where shaft dynamics are unknown and wider measurement ranges are safer.

• Gearboxes and Auxiliary Drives: Identifying structural instability in machinery with significant shaft play.

System Compatibility

This probe is exclusively designed for the Bently Nevada 3300 XL 11 mm transducer system. It is vital to note that 11 mm probes are not electrically interchangeable with 8 mm or 5 mm probes; they require a specifically calibrated 3300 XL 11 mm Proximitor sensor. Using the 330710 probe with an incompatible Proximitor or legacy 3300 series monitor will introduce significant measurement non-linearity, gain errors, and calibration drift. Ensure that the monitor channel is explicitly configured for 11 mm probe scaling (typically 100 mV/mil) before proceeding with commissioning.

Installation Protocols

• Gap Verification: Use a precision depth micrometer or feeler gauge. Always check the static gap voltage; aim for -10 VDC center-point to maximize linear operating range.

• Mounting Rigidity: Due to the larger probe diameter, ensure the mounting bracket is exceptionally rigid. Any mechanical flexure in the mounting interface will introduce erroneous low-frequency noise.

• Conduit Requirements: The coaxial cable must be protected in rigid, grounded metallic conduit to prevent EMI interference, which is more noticeable in the larger coils of the 11 mm design.

• Connector Sealing: Ensure the coaxial connection is protected from fluid ingress. Even though the probe tip is chemically resistant, the connector is not designed for submersion in oil or water.

• Grounding: Secure the probe housing to the machine frame to provide a consistent electrical ground, which is essential for accurate eddy-current field generation.

Product Advantages

• Extended Linear Range: Provides 160 mils of linear range, doubling the capacity of standard 8 mm probes for complex monitoring requirements.

• Superior Signal-to-Noise Ratio: The larger coil geometry provides a higher signal output, which helps maintain signal clarity over longer distances.

• Robust Industrial Design: Built with the same high-temperature materials and structural integrity that define the 3300 XL series.

• Predictive Analytics Reliability: Enables the monitoring of larger shaft movements, providing a more comprehensive view of rotor health during transient states like startup and shutdown.

Ordering Information

• 330710-000-060-50-02-00: 11 mm Proximity Probe

• Installation datasheet

• Protective connector thread cover

• Note: Confirm your 11 mm Proximitor calibration settings and mounting bore diameter before final installation.

Frequently Asked Questions

• Q: Can this probe be used in an 8 mm system?

• A: No, the 11 mm probe has different electrical characteristics and coil inductance. It will not function accurately without a corresponding 11 mm Proximitor.

  
  

• Q: What is the primary difference in linear range?

• A: The 11 mm probe provides 160 mils (4.0 mm) of linear range, whereas standard 8 mm probes are limited to 80 mils (2.0 mm).

  
  

• Q: How does the probe tip diameter affect mounting?

• A: The larger diameter requires a larger mounting bore; ensure your machine casing has adequate space and properly threaded mounting holes.

  
  

• Q: Is this probe compatible with 3500 monitoring racks?

• A: Yes, it is fully compatible, provided the monitor module and sensor channel are correctly configured for 11 mm probe scaling.

  
  

• Q: Why is the scale factor different from 8 mm probes?

• A: The 11 mm design requires different signal conditioning to handle the increased eddy-current field produced by the larger tip.

  
  

• Q: How do I identify a faulty 11 mm probe?

• A: Check for erratic DC gap voltages, high noise levels in the raw vibration waveform, or a completely open/short circuit on the Proximitor loop.

  
  

• Q: Can I use this probe in a high-temperature gas turbine?

• A: Yes, it is rated for up to 177 deg C; ensure it is not placed directly into the combustion path or unshielded exhaust zones.

  
  

• Q: How long is the supplied cable?

• A: This specific part number includes a 5.0-meter integral cable; always account for this length in your system loop impedance calculation.

  
  

• Q: Are these probes suitable for thrust position monitoring?

• A: Yes, the increased linear range makes them ideal for axial thrust monitoring where shaft movement may exceed the limits of smaller sensors.

  
  

• Q: Why must I check the Proximitor settings?

• A: The system calibration is dependent on the Proximitor being matched to the specific coil inductance of the 11 mm probe tip.