The Bently Nevada 330104-00-05-50-02-05, also cataloged as the 330104 Proximity Probes, operates as a dedicated hardware component for eddy-current signal sensing within 3300 XL Transducer System platforms.

Model Suffix Definitions

The 330104-00-05-50-02-05 part number signifies the following hardware configuration:

• 00: Unthreaded length (0 mm).

• 05: Overall case length (50 mm).

• 50: Total length (5.0 meters).

• 02: Connector option (Miniature coaxial).

• 05: Agency approval option (Multiple agency compliance).

Hardware Specifications

Eddy-Current Signal Conditioning

The 3300 XL system utilizes precise eddy-current probe scaling to ensure linear voltage output relative to shaft-to-probe gap. The transducer loop is factory-calibrated to a sensitivity of 7.87 V/mm (200 mV/mil). During system commissioning, gap voltage validation targets of -10 VDC at the Proximitor output are mandatory. This baseline ensures the probe operates within the linear portion of its electromagnetic range. Signal integrity relies on proper impedance matching across the probe, extension cable, and Proximitor sensor. Cross-talk suppression is maintained by adhering to minimum spatial separation requirements between adjacent probes, preventing interference from overlapping excitation fields in multi-channel rotor monitoring arrays.

Ordering Information

• 330104-00-05-50-02-05 Proximity Probe assembly

• Mounting locknut and flat washer

• Technical datasheet and regulatory documentation

• Protective connector thread caps

Installation Protocol

• Gap Adjustment: Establish the mechanical gap using a calibrated depth micrometer or feeler gauge. Verify the -10 VDC output at the Proximitor terminal before final locknut torque application.

• Mounting Torque: Tighten the locknut to the specified value to prevent sensor drift during thermal expansion. Avoid over-tightening to maintain housing integrity.

• Cable Routing: Protect coaxial leads within grounded rigid metallic conduit to mitigate electromagnetic interference and prevent mechanical abrasion.

• Shielding: Ensure the cable shield is terminated at the designated instrumentation ground point to minimize 50/60 Hz signal noise and common-mode interference.

Frequently Asked Questions

• Q: Is this probe compatible with legacy 3300 series Proximitor sensors?

• A: No. The 330104 series is exclusively designed for 3300 XL system electronics. Compatibility with legacy hardware will result in scaling inaccuracies.

• Q: Can the 5.0-meter integral cable be field-spliced?

• A: No. The cable is a precision-tuned component. Splicing or modifying the length will alter system impedance and invalidate calibration.

• Q: What is the minimum recommended bend radius for the coaxial cable?

• A: Maintain a minimum bend radius of 64 mm (2.5 inches) to prevent dielectric deformation and impedance shifts.

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

• A: Adjust the gap until the Proximitor output reaches the nominal -10 VDC. Any deviation beyond the linear range limits will result in signal clipping.

• Q: Does the agency approval (05) suffix affect electrical performance?

• A: No. The agency suffix indicates compliance with hazardous area and safety regulations but does not alter the fundamental transducer sensitivity.

• Q: What is the primary cause of signal drift in these probes?

• A: Drift is typically caused by thermal expansion of the housing, loose locknuts, or cable degradation due to vibration-induced abrasion.

• Q: Can this probe measure vibration on non-conductive targets?

• A: No. The transducer relies on eddy-current induction, which requires a conductive metallic target to create the electromagnetic field.

• Q: Is the connector assembly field-serviceable?

• A: No. The miniature coaxial connector is factory-terminated. Any physical damage to the connector or cable jacket necessitates a complete unit replacement.