The Bently Nevada 330730-080-11-05, also cataloged as the 330730 Extension Cable, operates as a dedicated hardware component for proximity signal transmission within 3300 System platforms.

Option Code Breakdown

• 330730: Base model identifier for the 3300 XL 11 mm extension cable configuration.
• 080: Specifies a total physical cable length of 8.0 m (26.2 ft).
• 11: Dictates an armored FluidLoc cable assembly designed to prevent liquid migration.
• 05: Grants multiple agency hazardous area approvals for international installation compliance.

Operational Parameters

Proximity Probe Scaling and Gap Voltage Validation

The exact physical properties of the transmission line directly dictate the eddy-current probe scaling metrics for the matched Proximitor Sensor. Impedance mismatch or variations in the 69.9 pF/m typical electrical capacitance will destabilize the high-frequency RF envelope, inducing linear range degradation during rotor dynamics tracking.

Adherence to the recommended gap setting of 2.5 mm (100 mils) yields optimal positioning within the linear output curve. This strict layout facilitates correct gap voltage validation, maintaining consistent baseline target readings near -10 VDC at the monitor backplane. Proper physical shielding across the physical length yields cross-talk suppression when routing adjacent transducer signals within shared machine conduits.

Package Components

• 1 x Bently Nevada 330730-080-11-05 Armored Cable Assembly
• 2 x Coaxial Connector Protectors

Handling and Installation Routing Guidelines

• Minimum Bend Radius Constraints: Do not bend the armored cable beyond its minimum specified bend radius of 25.4 mm (1.0 in) to prevent permanent mechanical deformation of the internal coaxial dielectric layer.
• Connector Torque and Isolation: Tighten the miniature coaxial connectors finger-tight, then apply the specified click-torque tool to lock the junction. Insulate the outer connection using clear silicone boot sleeves to isolate it from machine ground.

Technical Support Explanations

• How does changing the total system length alter the sensor system calibration?

  The Proximitor relies on a fixed total electrical length of 5 or 9 meters. Altering the physical cable length modifies the total circuit capacitance and destroys the linear calibration.

• What is the specific physical function of the FluidLoc design suffix?

  The FluidLoc design features internal blocking material within the jacket matrix to prevent pressurized oil or process gases from migrating through the core of the cable into clean junction boxes.

• Can this extension cable be hot-swapped while the 3300 monitor rack is energized?

  Yes, this passive component carries low-voltage RF signals. Disconnecting it will not damage the Proximitor, though it will immediately trigger a permanent channel Direct OK fault at the rack.

• What happens to the gap voltage validation if moisture penetrates the connector junction?

  Moisture ingress introduces a parallel resistance path that changes the impedance profile, causing the monitor to read an erratic or severely shifted DC gap voltage outside the nominal -10 VDC band.

• Is it acceptable to splice this cable in the field if it is cut by machine components?

  No, physical field splicing alters the internal geometry and electrical properties of the coaxial core, causing major signal reflections that negate the standard DSL range accuracy.

• Why is the Proximitor sensor housing constructed out of A380 aluminum?

  The companion A380 aluminum housing delivers structurally rigid environmental shielding and acts as a barrier against external electromagnetic interference affecting the sensor circuit.

• How do you ensure proper cross-talk suppression when routing multiple 11 mm cables together?

  Cables must utilize intact external armor layers and run inside dedicated metal conduit trays. Avoid routing them parallel to high-current AC power lines to maintain isolation.

• What is the exact definition of the standard DSL range metric listed in the specs?

  The Direct Sensor Linearity (DSL) range defines the maximum allowable deviation from an absolute straight line within the calibrated 2.5 mm measurement gap window during inspection.