Bently Nevada 330930-060-02-05 Extension Cable – 3300 XL Series

Bently Nevada 330930-060-02-05: 5-Meter Armored Extension Cable for 3300 XL Eddy-Current Measurement Chains

The Bently Nevada 330930-060-02-05 is a 5-meter (16.4 ft) armored coaxial extension cable engineered as the signal-path segment between an 8 mm eddy-current proximity probe and its paired 3300 XL Proximitor/Oscillator. Within a Bently Nevada measurement chain, the extension cable is not a passive conductor — it is a precision impedance element. The proximitor’s internal oscillator drives a resonant LC circuit whose total inductance and capacitance are distributed across the probe coil, the integral cable, and this extension cable. Any deviation in the extension cable’s characteristic impedance, dielectric constant, or total length shifts the resonant frequency, directly corrupting the gap-voltage-to-displacement transfer function. The 330930-060-02-05 is factory-matched to deliver a nominal system impedance of 350 Ω when combined with a 3300 XL 8 mm probe and the corresponding proximitor, maintaining the calibrated sensitivity of −7.87 V/mm (−200 mV/mil) across the full measurement range.

The cable assembly carries the designation breakdown: 330930 (product family — 3300 XL armored extension cable), 060 (nominal length 6.0 m before connector termination, yielding a usable 5 m run), 02 (armored jacket variant), 05 (connector style — MIL-C-5015 bayonet-lock). This part is stocked at siemensplc.com’s Xiamen warehouse and ships globally with same-week dispatch for in-stock quantities.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330930-060-02-05 operates within a three-element eddy-current measurement chain. Understanding its hardware role requires examining the signal physics at each interface.

Impedance Matching and Resonance Stability. The 3300 XL proximitor oscillates at approximately 1 MHz. The probe coil, integral cable, and extension cable form a distributed-parameter transmission line. The extension cable’s PTFE dielectric (εr ≈ 2.1) and the precisely controlled conductor geometry maintain a stable propagation velocity, ensuring that the electrical length of the 5 m run does not introduce phase shifts that would detune the resonant circuit. Substituting a cable with a different dielectric — even at the same physical length — alters the effective electrical length and shifts the operating point on the gap-voltage curve, introducing a systematic measurement error that cannot be corrected by field calibration alone.

EMC Design and Armor Function. The stainless steel interlocked armor serves a dual mechanical and electromagnetic role. Mechanically, it protects the PTFE-insulated center conductor from crush loads, abrasion, and chemical attack in turbine and compressor environments. Electromagnetically, the armor acts as a Faraday shield, attenuating external electric fields that would otherwise couple into the high-impedance signal path and appear as noise on the gap-voltage output. The armor is grounded at the proximitor end only (single-point grounding), preventing ground-loop currents from flowing through the shield and introducing 50/60 Hz interference into the measurement signal. This single-end grounding topology is a deliberate design choice that distinguishes the 330930 series from generic shielded cables.

Connector Integrity and Contact Resistance. The MIL-C-5015 bayonet-lock connector uses gold-plated beryllium-copper contacts. Gold plating eliminates oxide layer formation that would increase contact resistance over time — a critical consideration because even a 1 Ω increase in series resistance in the signal path shifts the gap voltage by a measurable amount at the proximitor input. The bayonet-lock mechanism provides a defined mating force and prevents partial engagement, which is a common failure mode with threaded connectors in high-vibration environments.

Thermal Stability. PTFE’s dielectric constant varies by less than 0.3% across the rated −55 °C to +125 °C range. This thermal stability ensures that the cable’s electrical length — and therefore the measurement chain’s sensitivity — remains within the ±1% specification across the full operating temperature envelope, without requiring temperature compensation at the monitor level.

System Integration Benefits

• Plug-and-Replace Calibration Retention: Because the 330930-060-02-05 is manufactured to the same impedance specification as the original factory cable, replacing a failed extension cable with this part restores the measurement chain to its original calibrated state without requiring a new system calibration at the 3500 series monitor.
• API 670 Compliance: The cable meets the requirements of API Standard 670 (Machinery Protection Systems), which mandates that all components in a vibration measurement chain be qualified and traceable. Using a non-qualified cable in an API 670 system constitutes a non-conformance that may void the machinery protection system’s certification.
• Deterministic Signal Latency: The fixed propagation velocity through the PTFE dielectric ensures that signal transit time through the 5 m cable is constant and predictable, supporting the 3500 monitor’s ability to detect sub-millisecond vibration transients without timing jitter introduced by the cable.
• Reduced Diagnostic Ambiguity: When a measurement chain produces anomalous readings, the use of a genuine 330930-series cable eliminates the cable as a variable. Maintenance engineers can focus diagnostics on the probe gap, proximitor bias voltage, and monitor channel rather than investigating cable impedance drift.
• Mechanical Robustness in Rotating Machinery Environments: The armored construction withstands the continuous low-frequency vibration (10–200 Hz) and occasional high-amplitude shock events characteristic of turbine and compressor pedestals, reducing cable-induced false trips caused by connector fretting or conductor fatigue.
• Chemical Resistance: The PTFE outer jacket and stainless armor resist hydrocarbon lubricants, steam condensate, and cleaning solvents common in power generation and petrochemical plants, extending service intervals compared to PVC-jacketed alternatives.
• Single-Point Ground Architecture Compatibility: The cable’s shield termination design is compatible with the 3300 XL system’s single-point grounding scheme, preventing the introduction of common-mode noise that would degrade the signal-to-noise ratio at the monitor input.
• Inventory Standardization: The 330930-060-02-05 is the most widely deployed length variant in the 3300 XL extension cable family, making it the logical choice for plant spare-parts standardization programs that seek to minimize SKU count while covering the majority of installation geometries.

Quality Assurance & Global Logistics

Every 330930-060-02-05 unit supplied by siemensplc.com is sourced from Bently Nevada’s authorized distribution network or verified factory-surplus channels with full lot traceability. Prior to dispatch, each cable undergoes a three-point inspection: connector contact resistance measurement (≤5 mΩ per contact), cable continuity and insulation resistance verification (≥1 GΩ at 500 V DC), and armor integrity check. Units are shipped in original Bently Nevada packaging where available; otherwise, anti-static, moisture-barrier packaging with desiccant is applied.

Logistics operations are based in Xiamen, China, with direct access to Xiamen Gaoqi International Airport and Xiamen Port, enabling air freight delivery to most global destinations within 3–5 business days. DHL Express, FedEx International Priority, and UPS Worldwide Express are standard carriers. For urgent plant shutdown requirements, same-day dispatch is available for confirmed in-stock units. Export documentation — including commercial invoice, packing list, and certificate of conformance — is prepared to meet customs requirements in the EU, USA, Southeast Asia, and the Middle East. A 12-month warranty covers manufacturing defects; warranty claims are processed with replacement dispatch within 48 hours of defect confirmation.

Contact Information

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