The Bently Nevada 330101-00-24-10-12-CN, also cataloged as the 330101 Proximity Probe, serves as a high-precision sensing element for the 3300 XL Transducer System. Specifically engineered for demanding turbomachinery environments, this 8 mm diameter probe utilizes eddy-current induction to provide high-resolution displacement data. It converts the distance between the probe tip and a conductive target into a voltage signal, functioning as the primary data acquisition element for radial vibration and axial position measurement across industrial machine protection platforms.

Suffix Breakdown & Model Matrix

The 330101-00-24-10-12-CN assembly is configured to meet specific installation and regional requirements:

• 00: Unthreaded length (0 mm)

• 24: Overall case length (24 mm)

• 10: Total length (1.0 meter)

• 12: Connector type (Miniature coaxial, specialized configuration)

• CN: Regional configuration (Standardized for specific regulatory compliance)

Hardware Specifications

Mechanical Monitoring & TSI Characteristics

The 3300 XL system is designed for machinery protection where reliable data acquisition is mandatory. The system's sensitivity is factory-tuned to 7.87 V/mm (200 mV/mil), providing the high gain necessary to detect subtle rotor dynamics. During commissioning, the probe must be gapped to the mid-point of the linear range, typically verified by observing a -10 VDC output at the Proximitor sensor. Proper installation is critical for signal linearity; any mechanical resonance in the probe mounting bracket or proximity to metallic surfaces can induce unwanted signal artifacts. Cross-talk suppression is managed by adhering to physical spacing requirements between multiple probe installations, ensuring the excitation field is not perturbed.

Ordering Info

• 330101 8 mm Proximity Probe

• Installation hardware package (Locknut and washer)

• Product technical data sheet

• Note: This probe requires a matched 3300 XL Proximitor sensor to function within specified accuracy limits.

Field Installation Guidelines

• Gap Setting: Use a precision feeler gauge to set the gap. Verify that the Proximitor output voltage is -10 VDC before finalizing the locknut position.

• Torque Application: Tighten the locknut to the recommended torque specifications to prevent sensor migration during thermal cycling.

• Cable Management: Secure the coaxial cable to minimize movement; use industrial-grade ties and avoid tight bends that could stress the miniature connector.

• Grounding: Ensure the probe case has a clean, low-resistance path to the machine ground to minimize electromagnetic interference (EMI).

• Surface Inspection: Confirm the target shaft area is smooth and free from magnetic inclusions or burrs, as these will affect eddy-current field uniformity.

Frequently Asked Questions

• Q: Can this probe be used with a standard 3300 NSv system?

• A: No, 3300 XL probes must be paired with 3300 XL Proximitors. The sensing frequency and impedance are tuned specifically for the XL system.

• Q: Why is the 1.0 meter length critical?

• A: The cable length is an integral part of the system’s tuned impedance; it cannot be replaced or altered without compromising calibration.

• Q: What is the primary advantage of the 8 mm tip?

• A: The 8 mm tip is the industry standard for general-purpose turbomachinery, balancing sensitivity with mechanical robustness for 80 mil linear range.

• Q: Can I use this probe in a vacuum environment?

• A: Yes, the probe construction materials are compatible with vacuum environments, provided the temperature remains within the -51 to +177 deg C range.

• Q: What indicates a malfunctioning probe?

• A: A DC gap voltage outside the normal operating range (e.g., near -24 VDC or 0 VDC) or significant signal noise typically indicates a fault in the transducer loop.

• Q: Are these probes suitable for steam turbine applications?

• A: They are suitable, provided the temperature and pressure limits are respected. They are commonly used on steam turbine radial and axial monitoring.

• Q: How do I prevent signal interference?

• A: Keep signal cables away from high-voltage AC lines and ensure all connections are tight and protected in a grounded junction box.

• Q: What is the significance of the "CN" suffix?

• A: The "CN" suffix indicates that the assembly complies with specific regional regulatory and manufacturing standards for the target market.