330130-085-00-CN | Bently Nevada | 3300 XL Extension Cable

Configured for signal path extension in machine monitoring systems, the Bently Nevada 330130-085-00-CN (330130 Extension Cable) provides direct electrical connection between the Proximitor sensor and the eddy-current probe. This assembly maintains the specific coaxial impedance and dielectric properties required to transmit high-frequency vibration signals while preserving the integrity of the measurement loop.

Suffix Breakdown & Model Matrix

Hardware Specifications

Rotor Dynamics and Gap Voltage Validation

The 3300 XL system requires precise impedance matching to maintain a linear scale factor of 7.87 V/mm (200 mV/mil). During the installation of this 8.5 m cable, technicians must validate the gap voltage at the Proximitor sensor output. A nominal target of -10 VDC at the center of the probe linear range is required to ensure accurate rotor dynamics measurements. Significant deviation from this voltage often indicates signal attenuation or improper shielding. To maintain signal fidelity, ensure proper cross-talk suppression by routing this cable in dedicated metallic conduit, physically isolated from high-voltage AC lines or variable frequency drive (VFD) output cables.

Frequently Asked Questions

Q: Can the 330130-085-00-CN be shortened to adjust for specific installation distances?

A: No. The cable is factory-calibrated as part of a complete 3300 XL system assembly. Modifying the cable length alters the electrical capacitance and characteristic impedance, which invalidates the calibration and results in measurement errors.

Q: How is the shield handled in this triaxial configuration?

A: The shield must be continuous through the extension cable connectors. The system should be grounded at a single point, typically at the Proximitor end, to avoid ground loops that introduce noise into the transducer signal.

Field Installation Guidelines

• Mechanical Protection: Since this model lacks a connector protector (00 option), ensure all connection points are housed within a junction box or properly sealed enclosure to prevent environmental ingress.
• Bend Radius: Adhere to a minimum static bend radius of 25.4 mm (1.0 inch). Sharp bends will cause dielectric deformation and degrade the signal frequency response.
• Connector Maintenance: Ensure threads are clean before mating. Apply dielectric grease to the connector threads if the installation environment is prone to high humidity to prevent oxidation.
• Cable Routing: Avoid pulling the cable by the connector. Always use the cable jacket when pulling through conduit to prevent damage to the internal conductors.