Configured for high-accuracy displacement sensing in 3300 NSv monitoring platforms, the Bently Nevada 330930-065-01-01 (330930 Proximity Probe) provides direct physical/electrical execution of non-contact shaft position and vibration measurement. This hardware utilizes an eddy-current transducer principle to track rotor surface motion relative to the probe tip. It functions as an integral component of a coupled signal chain, requiring a dedicated Proximitor sensor for excitation and demodulation. The device delivers a voltage output proportional to the gap between the probe tip and the conductive target, enabling the monitoring of dynamic shaft behavior in machinery.

Model Configuration Matrix

The 330930-065-01-01 is a factory-configured transducer assembly defined by the following parameters:

• 065: Probe length and case configuration

• 01: Total length (cable assembly)

• 01: Connector and agency approval classification

Hardware Specifications

Mechanical Monitoring & TSI Characteristics

The NSv probe series is designed for small-diameter shaft applications. Eddy-current probe scaling is calibrated to ensure linear output relative to gap distance. During installation, gap voltage validation is required to ensure the probe is positioned within the specified linear operating range, typically targeting -10 VDC when centered at the midrange gap. Proper rotor dynamics analysis relies on the signal integrity provided by these probes, necessitating strict adherence to installation torque specifications to prevent mechanical resonance. Cross-talk suppression is maintained by adhering to minimum physical spacing requirements between adjacent probes to prevent frequency interference.

Ordering Info

• 330930 NSv Proximity Probe

• Technical installation manual

• Protective thread cover

• No mounting brackets or locknuts included

Field Installation Guidelines

• Gap Setting: Use a feeler gauge to establish the initial gap; verify final gap voltage at the Proximitor output terminals using a high-impedance multimeter.

• Torque Specifications: Secure the probe locknut to the recommended torque value to prevent shifting caused by machine case vibration.

• Cabling: Route coaxial cabling in dedicated shielded conduit; avoid sharp bends that exceed the minimum bend radius specifications.

• Grounding: Ensure the probe case maintains continuity with the machine chassis to provide a stable electrical reference.

• Inspection: Verify the conductive target surface is free of debris, machining burrs, or non-conductive coatings prior to final gap adjustment.

Frequently Asked Questions

• Q: Is this probe compatible with standard 3300 XL Proximitors?

• A: No, the 330930 NSv probe is designed exclusively for use with the 3300 NSv Proximitor sensor and is not interchangeable with 3300 XL components.

• Q: What is the purpose of the -10 VDC gap target?

• A: Targeting -10 VDC centers the probe in its linear operating range, allowing for the maximum range of shaft motion measurement before signal clipping occurs.

• Q: Can the coaxial cable be shortened or spliced?

• A: No, the cable length is calibrated as part of the total system impedance; modifying the cable will invalidate the calibration and measurement accuracy.

• Q: What is the maximum linear range?

• A: The linear range is approximately 2.0 mm; always refer to the calibration documentation provided with the specific probe for exact range limits.

• Q: How does temperature affect the probe output?

• A: While rated for up to 177 deg C, thermal expansion of the probe case may cause minor gap voltage shifts; verify the gap after the machine reaches operating temperature.

• Q: Is the miniature coaxial connector waterproof?

• A: No, the connector must be housed in a protected junction box to prevent moisture ingress and contamination of the signal path.

• Q: What indicates probe failure?

• A: A sudden loss of gap voltage or erratic signal noise usually indicates a damaged cable, a compromised connector, or physical damage to the probe tip.

• Q: Are there specific installation spacing requirements?

• A: Yes, minimum distance requirements must be maintained between probes to prevent cross-talk interference from excitation frequencies.