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The Bently Nevada 330130-085-02-05, also cataloged as the 330130 Extension Cable, operates as a dedicated hardware component for high-frequency signal transmission within 3300 XL Proximity Transducer Systems. It routes dynamic analog displacement signals between proximity probes and Proximitor sensors without signal loss or amplitude distortion across continuous machinery protection channels.

Suffix Breakdown & Model Matrix

Option Code Designation Parameter Value / Option Description
330130 Base Model 3300 XL Standard Extension Cable
-085 Cable Length Option 8.5 meters (27.9 feet)
-02 Connector Protector and Cable Option Standard cable with connector protectors
-05 Agency Approval Option Multiple Approvals

Hardware Specifications

Parameter Specification
Model 330130-085-02-05
Base Model 330130
Brand Bently Nevada
Series 3300 XL
Product Type Extension Cables
Origin USA
Cable Length 8.5 meters (27.9 feet)
Cable & Connector Configuration Standard coaxial cable with integrated connector protectors
Agency Approval Option Multiple Approvals (-05 option)
Operating Temp -51 to +177 deg C (Standard 3300 XL cable environment rating)
Power Consumption Passive physical component (0 W)
Dimensions Standard 8.5 m cable length assembly
Weight 2 kg (Shipping Weight)
System Impedance 75 ohm coaxial matched construction

Eddy-Current Probe Scaling & Signal Line Integrity

The 330130-085-02-05 extension cable maintains precise electrical length and 75 ohm coaxial impedance to preserve original eddy-current probe scaling across the transducer circuit. Length deviations or improper capacitance degrade the high-frequency excitation field emitted by the paired 3300 XL Proximitor sensor, shifting the standard 7.87 V/mm (200 mV/mil) output scale factor. Proper connection continuity enables exact gap voltage validation targeting -10 VDC at nominal shaft center position, suppressing cross-talk and delivering undistorted dynamic signal paths for continuous tracking of rotor dynamics.

Frequently Asked Questions

Q: Why must total electrical length be verified when using the 330130-085-02-05 extension cable?

A: Bently Nevada 3300 XL Proximitor sensors are calibrated for total system lengths (typically 5.0, 9.0, or custom total meters). An 8.5-meter extension cable must pair with a specific probe lead length (such as a 0.5-meter probe lead) to equal the exact system length specified on the Proximitor label; mismatched total lengths cause scale factor errors.

Q: What protection is provided by the -02 connector option?

A: Option -02 supplies elastomeric connector protectors over the miniature coaxial joining ends. These protectors prevent moisture, oil, and conductive debris from contaminating the coaxial connection while isolating the metallic outer shell from ground contact.

Q: How does proper cable shielding prevent ground loop currents in TSI monitoring racks?

A: Coaxial shielding must remain isolated from intermediate junction boxes or ground conduits along the field run. Establishing a single ground reference at the Proximitor sensor chassis prevents circulating ground loops from interfering with low-amplitude vibration signals.

Field Installation Guidelines

  1. Inspect the male and female miniature coaxial connectors for cleanliness, bent pins, or foreign matter before mating. Clean contaminated surfaces using non-residue contact cleaner.
  2. Align coaxial ends and thread finger-tight until fully seated. Use recommended coaxial torque wrenches to apply proper tightening torque without over-stressing connector threads.
  3. Slide the silicone connector protectors completely over the mated joint to seal the connection against fluid ingress and isolate the metallic housing from grounding against local structures.
  4. Route the cable through dedicated protective conduit or cable trays, adhering to a minimum bend radius of 25 mm (1.0 inch) to prevent structural damage to the inner conductor or outer jacket.
  5. Secure the cable using non-crushing cable clamps spaced at regular intervals to minimize mechanically induced noise and vibration fatigue along the cable run.

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