Bently Nevada 330130-040-13-00 Extension Cable – 3300 XL Series

Bently Nevada 330130-040-13-00 — Precision Coaxial Extension Cable for 3300 XL Eddy-Current Proximity Measurement Chains

The Bently Nevada 330130-040-13-00 is a factory-terminated, 40-inch (1016 mm) coaxial extension cable purpose-built for the 3300 XL eddy-current proximity measurement system. Within a three-component measurement chain — proximity probe, extension cable, and Proximitor® sensor — this cable occupies the critical signal-conditioning link between the probe tip and the signal processing electronics. Its electrical and mechanical parameters are not interchangeable with generic coaxial assemblies; the total system length, impedance continuity, and connector geometry are co-calibrated at the factory to maintain the Proximitor’s ±0.5% full-scale linearity across the full operating gap range.

In rotating machinery protection applications governed by API 670 (5th Edition), the measurement chain must deliver a stable DC gap voltage proportional to shaft displacement with sub-micron resolution. The 330130-040-13-00 achieves this by maintaining a nominal 50 Ω characteristic impedance throughout its armored coaxial construction, ensuring that the oscillator frequency generated by the Proximitor — typically 200 kHz for 8 mm probes — propagates to the probe coil without reflective loss or phase distortion. Any deviation in cable impedance or length shifts the resonant operating point of the eddy-current circuit, introducing a systematic offset in the gap voltage output that cannot be corrected by field calibration alone.

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Technical Parameters

Hardware Logical Analysis

The 330130-040-13-00 is not a passive conductor — it is an active element in a tuned LC resonant circuit. The Proximitor sensor drives the probe coil at a fixed oscillator frequency. As the conductive target (shaft) approaches the probe tip, eddy currents induced in the shaft surface load the coil, reducing oscillation amplitude. The Proximitor demodulates this amplitude change into a linear DC voltage output (typically –24 VDC supply, –200 mV/mil or –7.87 V/mm sensitivity for 8 mm probes). The extension cable’s role is to transmit the oscillator signal to the probe and return the modulated signal to the Proximitor without introducing parasitic capacitance or inductance that would detune the resonant circuit.

The stainless-steel interlocked armor provides three simultaneous functions: mechanical protection against abrasion and crush loads in congested turbine pedestals; EMC shielding that attenuates radiated interference from adjacent VFDs, bus bars, and ignition systems; and a grounded outer conductor that prevents triboelectric noise generation from cable flexure. The PTFE inner insulation maintains dielectric stability across the full –40 °C to +85 °C range, preventing capacitance drift that would shift the resonant frequency and corrupt the gap voltage baseline. Factory-terminated connectors eliminate field-soldered joints — a known failure mode in high-vibration environments where cold solder joints develop micro-fractures over time.

The 40-inch length is not arbitrary. Bently Nevada calibrates each Proximitor to a specific total system length (probe cable + extension cable). The 330130-040-13-00 is matched to standard 5-meter and 9-meter system configurations. Substituting a non-standard length shifts the total system capacitance, moving the operating point off the linear portion of the probe’s sensitivity curve and introducing a length-dependent sensitivity error that cannot be nulled by the Proximitor’s internal span adjustment.

System Integration Benefits

• Deterministic gap voltage linearity: Factory-matched length and impedance preserve the Proximitor’s ±0.5% full-scale linearity, ensuring alarm and trip setpoints remain accurate without periodic recalibration.
• Zero-recalibration replacement: Identical electrical parameters to the original OEM cable allow like-for-like swap during planned outages without requiring Proximitor span or zero adjustment.
• EMC-hardened signal path: Stainless-steel armor provides continuous 360° shielding, maintaining signal integrity in switchgear rooms and motor control centers where radiated EMI exceeds 10 V/m.
• Chemical resistance for process environments: PTFE insulation withstands continuous exposure to turbine lube oil, hydraulic fluid, glycol coolants, and alkaline cleaning agents without swelling or dielectric degradation.
• Mechanical durability in high-vibration zones: Interlocked armor construction tolerates sustained vibration levels consistent with machinery pedestals, preventing armor fatigue failure that occurs with braided-shield cables over multi-year service intervals.
• API 670 compliance assurance: Using OEM-specified cables maintains the measurement chain’s compliance with API 670 Section 5 requirements for proximity measurement systems, a mandatory audit point in many refinery and power plant machinery protection programs.
• Hazardous-area suitability: When paired with ATEX/IECEx-certified probes and Proximitors, the 330130-040-13-00 supports installation in Zone 1 and Zone 2 classified areas without requiring additional cable barriers, simplifying the Ex documentation package.
• Diagnostic transparency: A correctly installed OEM cable eliminates cable-related variables from fault diagnosis. When a Proximitor reports an out-of-range gap voltage, engineers can confidently attribute the fault to probe wear, shaft runout, or Proximitor failure — not cable impedance drift.
• Long mean time between replacement: PTFE insulation and stainless armor extend service life beyond 10 years in typical turbine hall environments, reducing the frequency of planned cable replacement during major overhauls.

Quality Assurance & Global Logistics

Every 330130-040-13-00 unit supplied by siemensplc.com is sourced through verified channels and subjected to incoming inspection covering connector seating integrity, armor continuity, and coaxial impedance verification. Units are individually packaged in anti-static bags with desiccant and labeled with traceability documentation. Provenance records are available upon request for customers operating under ISO 55000 asset management or API 670 audit requirements.

Dispatch is handled from our Xiamen, China operations center. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for every international shipment. Logistics options include DHL Express (2–4 business days to most destinations), FedEx International Priority, and consolidated sea freight for project-quantity orders. Urgent shutdown support orders placed before 14:00 CST are typically dispatched same day. Customers in Southeast Asia, the Middle East, and Europe have received units within 72 hours of order confirmation under express routing.

Contact Information

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