The Bently Nevada 330904-00-12-05-02-00, also cataloged as the 330904-00-12-05-02-00 Proximity Probes, operates as a dedicated hardware component for non-contacting displacement measurement within 3300 NSv transducer systems.

Model Matrix Breakdown

• 330904: Base Model (3300 NSv Proximity Probe)

• 00: Unthreaded Length (00 mm)

• 12: Overall Case Length (12 mm)

• 05: Total System Length (0.5 meter)

• 02: Connector Type (Miniature coaxial ClickLoc connector)

• 00: Agency Approval (Standard)

Hardware Specifications

TSI Mechanical Monitoring & Scaling

The 3300 NSv transducer system relies on eddy-current probe scaling to convert high-frequency displacement signals into linearized voltage outputs. During system calibration, gap voltage validation against -10 VDC targets at the oscillator output ensures the probe is positioned within its linear operating range. This system is essential for precision rotor dynamics monitoring, where accurate identification of shaft position and vibration is required. Cross-talk suppression is maintained through integrated frequency-coding in the probe-oscillator pair, preventing interference between adjacent sensors in multi-channel monitoring arrangements.

Ordering Info

• One (1) 330904-00-12-05-02-00 Proximity Probe

• Connector protection cap

• Technical documentation

Field Installation Guidelines

• Mechanical Mounting: Thread the probe into the mounting bracket; verify the gap distance using a feeler gauge to match the nominal -10 VDC operational target.

• Signal Routing: Use grounded metallic conduit for coaxial cabling to prevent electromagnetic interference; respect the minimum bend radius of the cable.

• Grounding: Secure the probe body to the machine frame to ensure a consistent electrical ground reference for the eddy-current field.

• Connection Verification: Ensure coaxial connectors are hand-tightened and free of foreign debris; inspect for signal continuity before system startup.

Frequently Asked Questions

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

  A: No, the 330904 NSv probe is engineered for the NSv system and is not compatible with standard 3300 XL monitoring platforms.

• Q: How is the correct probe gap determined?

  A: The gap is validated by measuring the DC output voltage at the oscillator; the target is -10 VDC when the shaft is at the nominal position.

• Q: Can the coaxial cable be shortened in the field?

  A: No, field modification of the cable length alters the electrical resonance, which invalidates the factory-calibrated system scale factor.

• Q: What effect does shaft material have on accuracy?

  A: The system is factory-calibrated for 4140 steel; usage with other materials requires a scaling factor correction to maintain measurement accuracy.

• Q: What is the purpose of the connector protector cap?

  A: The cap prevents moisture, dust, or grease from entering the coaxial connection during installation, preserving signal integrity.

• Q: Is the probe a powered device?

  A: No, it is a passive transducer that receives radio-frequency excitation power from the matched 3300 NSv oscillator unit.

• Q: What causes unstable or drifting signal outputs?

  A: Instability is typically caused by loose coaxial connections, excessive electrical noise, or degradation of the cable's shielding insulation.

• Q: Can I use thread-locking compounds on the probe?

  A: Avoid using thread-locking compounds, as they can create an insulating barrier that disrupts the required ground path to the machine casing.