Bently Nevada 330130-080-03-CN Extension Cable – 3300 Series

Bently Nevada 330130-080-03-CN — 8-Meter Armored Coaxial Extension Cable in the 3300 Series Eddy-Current Measurement Chain

The Bently Nevada 330130-080-03-CN is an 8.0-meter armored coaxial extension cable purpose-built for the 3300 Series Proximitor® Sensor System. Within a complete eddy-current measurement chain — probe, extension cable, and Proximitor monitor — the extension cable carries the raw oscillator signal from the probe tip back to the Proximitor electronics without introducing impedance discontinuities or capacitive loading that would corrupt the gap-voltage output. At 50 Ω nominal impedance and with a PTFE-insulated inner conductor enclosed in stainless-steel armor, the 330130-080-03-CN maintains signal fidelity across the full −40 °C to +125 °C operating envelope found in turbomachinery bays, compressor trains, and petrochemical rotating equipment.

The CN suffix designates the Asia-Pacific regional specification variant, which includes connector plating and jacket formulation optimized for the humidity and chemical exposure profiles common in Chinese and Southeast Asian industrial facilities. The cable integrates directly with 3300 XL 8 mm and 11 mm eddy-current probes on the probe end and terminates at the Proximitor monitor input on the monitor end via MHV coaxial connectors — male at the probe junction, female at the monitor rack. No field re-termination is required; the factory-assembled connectors are torque-tested and continuity-verified before shipment.

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Technical Parameters

Hardware Logical Analysis

The eddy-current measurement chain operates on a carrier-frequency oscillator principle: the Proximitor drives a 1.0 MHz oscillator signal down the coaxial cable to the probe coil. The probe coil generates an alternating magnetic field; as a conductive target (shaft) approaches, eddy currents induced in the target surface load the coil, shifting the oscillator amplitude. The Proximitor demodulates this amplitude shift into a DC gap voltage — typically −4 VDC at 1.0 mm gap for an 8 mm probe system. The extension cable is therefore not a passive conductor; it is an active element of the resonant circuit.

Impedance Continuity: The 50 Ω characteristic impedance of the 330130-080-03-CN is factory-matched to the Proximitor’s output impedance and the probe coil’s equivalent circuit. Any impedance discontinuity — caused by a damaged connector, a kinked cable, or a non-OEM substitute with incorrect dielectric constant — introduces a reflection coefficient that shifts the oscillator operating point and produces a static offset error in the gap voltage output. At 8 m cable length, even a 3 Ω impedance deviation can produce a measurable DC offset at the Proximitor output.

Capacitance Budget: The 3300 Series Proximitor is calibrated for a specific total cable capacitance (probe cable + extension cable). The 330130-080-03-CN is manufactured to ≤ 95 pF/m, which, combined with the standard 3300 XL probe cable, keeps the total system capacitance within the Proximitor’s calibration window. Exceeding this budget — by substituting a cable with higher capacitance per meter — reduces the Proximitor’s linear measurement range and compresses the sensitivity curve.

EMC Design: The stainless-steel interlocked armor provides a continuous Faraday shield with transfer impedance below 10 mΩ/m at 1 MHz. In turbomachinery environments where variable-frequency drives, high-current bus bars, and ignition systems generate broadband electromagnetic interference, this shielding level is necessary to keep induced noise below the Proximitor’s 25 mV RMS noise floor specification. The armor also provides mechanical protection against abrasion from cable trays, thermal cycling fatigue, and incidental contact with lubricating oil or process chemicals.

Connector Termination Integrity: The MHV connectors are factory-crimped and solder-sealed, then 100% continuity- and insulation-resistance-tested at the factory. Field-assembled connectors — even when assembled by experienced technicians — introduce variability in center-pin alignment and dielectric gap that can shift the connector’s capacitance by ±5 pF, sufficient to cause a calibration offset in a tightly specified system.

System Integration Benefits

• Zero-recalibration drop-in replacement: The 330130-080-03-CN is dimensionally and electrically identical to the factory-installed cable in 3300 Series installations. Replacing a failed cable does not require Proximitor recalibration, provided the total system length (probe + extension) remains at 5 m or 9 m as originally specified.
• Deterministic gap-voltage linearity: Factory-matched impedance and capacitance ensure the Proximitor’s ±0.5% full-scale linearity specification is maintained across the full 0.25 mm to 2.54 mm measurement range, supporting API 670 machinery protection requirements.
• Extended temperature margin: The −40 °C to +125 °C rating provides a 25 °C margin above the typical turbomachinery bearing housing surface temperature of 100 °C, preventing dielectric softening and connector fretting that degrade signal integrity over time.
• Reduced scheduled maintenance burden: The stainless armor eliminates the jacket cracking and conductor corrosion that occur with PVC-jacketed cables in oil-mist environments, extending mean time between cable replacements from 2–3 years to 7–10 years in typical installations.
• Plug-and-play connector compatibility: MHV connectors mate directly with all 3300 Series Proximitor monitor inputs and 3300 XL probe junction boxes without adapters, eliminating the impedance discontinuities introduced by adapter fittings.
• Diagnostic transparency: Because the cable’s electrical parameters are tightly controlled, any shift in the Proximitor’s gap voltage output can be attributed to a change in the target gap rather than cable drift — improving the reliability of condition monitoring alarms and reducing nuisance trips.
• Compatibility with System 1 / System 1 Evolution: The cable’s signal characteristics are within the input specifications of Bently Nevada’s System 1 and System 1 Evolution condition monitoring platforms, supporting waveform capture, spectrum analysis, and trend logging without signal conditioning modifications.
• Regulatory and documentation compliance: Each unit ships with a Certificate of Conformance traceable to the manufacturing batch, supporting IEC 61511 functional safety documentation requirements and plant quality management system audits.

Quality Assurance & Global Logistics

Every Bently Nevada 330130-080-03-CN unit supplied by siemensplc.com is sourced through verified OEM distribution channels and authorized surplus networks. Before dispatch from our Xiamen, China facility, each cable undergoes a three-stage inspection protocol: visual examination of connector bodies and armor jacket for mechanical damage; DC continuity and insulation resistance measurement (≥ 1 GΩ at 500 VDC); and impedance spot-check at 1 MHz using a calibrated vector network analyzer. Units that fail any stage are quarantined and not shipped.

Original manufacturer packaging is preserved where available. Certificate of Conformance and, on request, original factory test reports are included with each shipment. For orders requiring export documentation — commercial invoice, packing list, HS code declaration — our logistics team prepares a complete set compliant with Chinese customs regulations and the destination country’s import requirements.

Shipping from Xiamen is available via DHL Express (2–4 business days to most destinations), FedEx International Priority, and sea freight for bulk orders. In-stock units are dispatched within 24 hours of order confirmation. For urgent MRO requirements, same-day dispatch is available for orders confirmed before 14:00 CST.

Contact Information

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