The Bently Nevada 330730-080-01-00, also cataloged as the 330730 Extension Cable, operates as a dedicated hardware component for signal transmission between an 11 mm Proximity Probe and a Proximitor Sensor within 3300 XL Machinery Protection System platforms. This coaxial cable maintains the integrity of the high-frequency carrier signal by ensuring specific capacitance and impedance characteristics required for accurate, linear translation of shaft displacement and vibration.

Suffix Breakdown

• 330730: 3300 XL 11 mm Extension Cable.

• 080: Cable length option (8.0 meters).

• 01: Connector option (Miniature coaxial ClickLoc connector).

• 00: Agency approval option (No approvals required).

Hardware Specifications

Eddy-Current Probe Scaling and Signal Integrity

The 3300 XL 11 mm system relies on the extension cable's precise electrical characteristics to maintain proper eddy-current probe scaling. The total system length, defined by the probe and this extension cable, determines the phase shift and attenuation of the radio frequency carrier signal. Field calibration must ensure that the total length matches the Proximitor's design requirements to facilitate gap voltage validation (-10 VDC targets). Maintaining proper shielding and cross-talk suppression by routing through dedicated conduits ensures that the signal remains uncontaminated by transient electromagnetic noise.

Ordering Information

• 1 330730-080-01-00 8.0 m Extension Cable

• 1 ClickLoc Connector Protector

• 1 Technical Installation Leaflet

Field Installation Guidelines

• Cable Routing and Protection

• Route the coaxial cable through a grounded metallic conduit system to isolate the signal from AC power lines and minimize EMI.

• Observe a minimum bend radius of 25.4 mm (1.0 in) to prevent damaging the internal dielectric or shielding layers.

• Connection and Security

• Fully engage the ClickLoc connectors at both the probe and Proximitor interfaces until a positive lock is confirmed.

• Use the provided connector protector or self-fusing silicone tape to seal the junction against moisture ingress in high-humidity environments.

Frequently Asked Questions

• Is it possible to shorten the 8.0 m cable to a custom length?

  No, the cable length is critical to the system's electrical tuning. Cutting or splicing will alter the capacitance and invalidate the calibration.

• Can this cable be used with an 8 mm probe system?

  No, the 330730 extension cable is specifically designed for 11 mm systems; using it with 8 mm hardware will result in significant signal errors.

• Is the ClickLoc connector hot-swappable?

  Yes, the connection can be disconnected or reconnected while the system is energized without damaging hardware, though a transient channel fault will occur.

• What is the impact of moisture on the coaxial interface?

  Moisture creates leakage paths that shift the gap voltage reading. Proper sealing with a connector protector is necessary to ensure consistent measurements.

• Does the cable require specific grounding?

  The cable shield is grounded through the connection to the Proximitor; ensure the system monitor and Proximitor are correctly bonded to a common ground.

• What is the consequence of exceeding the minimum bend radius?

  Bending the cable too sharply can deform the internal conductor or dielectric, leading to impedance mismatch and signal instability or attenuation.

• Are there any active components within this cable?

  No, the extension cable is a passive component containing only the coaxial conductor, shielding, and insulating jacket.

• How should the cable be secured within a junction box?

  Ensure the cable is supported to avoid strain on the ClickLoc connectors and kept away from vibration-prone structures that could cause chafing.