Configured for continuous non-contacting vibration and position monitoring in rotating machinery, the Bently Nevada 330104-00-05-10-12-05 (330104 Proximity Probe) provides direct physical signal transduction. This unit captures instantaneous relative motion between the probe tip and the observed conductive target, facilitating precise gap measurement and signal conditioning within the 3300 XL monitoring system.

Part Number Designation Analysis

The specified model corresponds to the following configuration:

• 330104: 3300 XL 8 mm Proximity Probe

• 00: Unthreaded Length (metric)

• 05: Overall Case Length (metric)

• 10: Total Length (metric)

• 12: Connector Type (Miniature coaxial ClickLoc connector with connector protector)

• 05: Agency Approval (Multiple approvals)

Hardware Physical Metrics

Eddy-Current Signal Dynamics

The proximity measurement relies on an eddy-current principle where the probe oscillates at a nominal 1 MHz radio frequency. The presence of a conductive target creates eddy currents, reducing the oscillator's amplitude. The system is factory-calibrated to a standard scale factor of 7.87 V/mm (200 mV/mil). Maintaining a nominal gap voltage of -10 VDC within the linear range is required to ensure rotor dynamics are captured without waveform clipping. Signal integrity depends on the elimination of cross-talk through proper cable shielding and grounding at the monitor termination point.

Procurement Package Contents

• 1 x 330104-00-05-10-12-05 8 mm Proximity Probe

• 1 x Factory calibration certificate (conformity report)

• 1 x Connector protector (pre-installed)

• Hardware documentation packet

Mechanical Mounting Procedures

• Ensure the probe is installed in a non-conductive holder or utilize an insulated sleeve if ground loops are detected.

• Verify the probe tip is recessed 0.5 mm from the inner surface of the probe holder to avoid mechanical contact.

• Torque the jam nut to the manufacturer-specified value using an appropriate torque wrench to prevent vibration-induced loosening.

• Route coaxial extension cables through grounded metallic conduit to suppress electromagnetic interference (EMI).

Technical Inquiry Index

• Q: What is the maximum distance for the extension cable?

  A: The system is designed for a total system length of 5 or 9 meters, including the probe and extension cable, to maintain frequency response.

• Q: How do I verify if the probe is functioning correctly?

  A: Measure the gap voltage at the monitor output; it should be stable at -10 VDC when the probe is at the nominal mechanical center.

• Q: Is this probe compatible with older 3300 series monitors?

  A: No, 3300 XL probes are specifically calibrated for 3300 XL Proximitor sensors; interchanging with older components alters the scale factor.

• Q: Can the PPS tip withstand synthetic lubricating oils?

  A: Yes, the Polyphenylene Sulfide material is chemically resistant to most standard industrial turbine and compressor lubricating oils.

• Q: What is the impact of side-view on readings?

  A: Side-view occurs when the probe tip is too close to the mounting hole wall; maintain a minimum clearance of 10 mm to avoid non-linear signals.

• Q: Are these probes repairable if the cable is cut?

  A: No, the coaxial cable is integral to the probe; any damage to the cable shielding or conductor requires the replacement of the entire probe assembly.

• Q: Does the probe require a specific grounding scheme?

  A: The probe case is electrically isolated from the system signal common to prevent ground loops; ensure the monitor common is properly grounded.

• Q: How often should the gap voltage be checked?

  A: Perform routine gap voltage validation during scheduled machine outages or whenever the machine reaches its nominal operating speed.