Bently Nevada 330130-085-02-00 Extension Cable – 3300 XL Series

Bently Nevada 330130-085-02-00 — 9-Meter Coaxial Extension Cable for 3300 XL Proximity Transducer Systems

The Bently Nevada 330130-085-02-00 is a 9-meter (nominal 8.5 m electrical length) armored coaxial extension cable engineered specifically for the 3300 XL Proximity Transducer System. Its function is to complete the three-component eddy-current sensing chain — probe, extension cable, proximitor — by transmitting the high-frequency oscillator signal from the proximitor to the probe tip and returning the gap-voltage analog back to the monitor rack. Any impedance discontinuity or capacitance deviation in this cable segment directly corrupts the gap-voltage-to-displacement transfer function; the 330130-085-02-00 is manufactured to eliminate that variable.

This cable is the standard 9-meter segment used when the probe-to-proximitor routing distance falls between approximately 7.6 m and 9.1 m. It pairs with 0.5 m or 1.0 m integral probe cables to achieve the system-calibrated total lengths of 9.0 m or 9.5 m respectively, preserving the ±0.5% full-scale linearity specification across the full measurement range.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL system operates on the eddy-current principle: the proximitor drives a 1 MHz oscillator signal down the coaxial cable to the probe coil. The probe’s electromagnetic field induces eddy currents in the target shaft surface; the resulting energy absorption shifts the oscillator’s output voltage in direct proportion to the air gap. The extension cable is not a passive conductor — it is an active element in the resonant circuit. Its capacitance per unit length, combined with the probe’s inductance, determines the resonant frequency and the slope of the gap-voltage curve (typically −7.87 V/mm for standard 8 mm probes).

The 330130-085-02-00 uses a PTFE (polytetrafluoroethylene) dielectric rather than polyethylene, which provides three measurable advantages: a lower dielectric constant (εr ≈ 2.1 vs. 2.3 for PE) that reduces capacitance variance with temperature, a wider operating temperature ceiling of +121 °C, and superior resistance to hydrocarbon contamination common in turbomachinery environments. The stainless steel interlocked armor provides mechanical protection against crush loads and abrasion without adding ferromagnetic material that could perturb the probe field.

EMC performance is achieved through the coaxial geometry itself: the outer braid provides a continuous Faraday shield, attenuating external RF interference by >60 dB across the 0.5–10 MHz band relevant to the oscillator frequency. The shield is grounded at the proximitor end only (single-point grounding), preventing ground-loop currents that would appear as low-frequency noise on the gap-voltage output. This architecture is consistent with IEC 61000-4-3 Class A immunity requirements for industrial environments.

The MIL-spec connectors use a bayonet-lock mechanism with gold-plated center pins, maintaining contact resistance below 5 mΩ across the rated temperature range. Contact resistance variation is the primary source of calibration drift in field-replaced cables; the gold plating eliminates the oxide layer formation that causes resistance creep in copper-only contacts over 12–18 months of service.

System Integration Benefits

• Preserved calibration linearity: Factory-matched capacitance ensures the gap-voltage slope remains within ±0.5% full-scale, eliminating the need for field recalibration after cable replacement.
• Deterministic signal latency: Fixed propagation delay of ~4.3 ns/m through PTFE dielectric allows the proximitor’s internal phase-compensation circuit to operate at its design point, maintaining <1 µs total signal latency from gap change to monitor input.
• API 670 compliance: The 330130-085-02-00 is part of the type-tested 3300 XL system assembly, satisfying API 670 Section 5.3 requirements for machinery protection systems without additional documentation.
• Plug-and-play replacement: Identical connector geometry and electrical characteristics mean zero reconfiguration of the monitor rack or DCS scaling factors upon replacement.
• High-temperature margin: The +121 °C rating provides a 21 °C thermal margin above the 100 °C ambient limit specified for most turbine bearing housings, reducing thermal derating risk.
• Vibration immunity: Interlocked armor construction passes IEC 60068-2-6 sinusoidal vibration testing at 10–500 Hz, 2 g, preventing intermittent contact faults in high-vibration compressor trains.
• Chemical resistance: PTFE dielectric and PVC overjacket resist lubricating oils, hydraulic fluids, and cleaning solvents, maintaining dielectric integrity in wet-area installations.
• Diagnostic transparency: The cable’s low and stable impedance allows the 3300 XL Proximitor’s built-in OK/Not-OK circuit to detect open-circuit and short-circuit faults within 100 ms, enabling fast fault annunciation to the DCS without masking real machinery events.

Quality Assurance & Global Logistics

Every 330130-085-02-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full traceability to Baker Hughes / Bently Nevada manufacturing records. Pre-shipment inspection covers connector continuity, shield integrity (DC resistance <0.5 Ω end-to-end), and physical armor condition. Units are supplied in original manufacturer packaging with batch/lot documentation available upon request for compliance audits.

Shipments originate from our Xiamen, China warehouse. Standard export routes cover Southeast Asia, the Middle East, Europe, and the Americas. Typical transit times are 3–7 business days via DHL Express or FedEx International Priority. For urgent MRO requirements, same-day dispatch is available for in-stock units ordered before 14:00 CST. All shipments include commercial invoice, packing list, and certificate of origin. Customs HS code 8544.42 applies to this cable category for most jurisdictions.

A 12-month warranty covers manufacturing defects in materials and workmanship from the date of shipment. Warranty claims are processed within 5 business days with advance replacement available for critical plant applications.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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