Bently Nevada 330103-17-22-10-12-05 Proximity Sensor Extension Cable – 3300 XL Series

Bently Nevada 330103-17-22-10-12-05 – Proximity Sensor Extension Cable for 3300 XL Transducer Systems

The Bently Nevada 330103-17-22-10-12-05 is a precision-engineered coaxial extension cable designed exclusively for use within the 3300 XL Proximity Transducer System. Its function is to bridge the signal path between the 3300 XL 8 mm proximity probe and the Proximitor sensor (oscillator-demodulator), maintaining the calibrated electrical characteristics upon which the entire eddy-current measurement chain depends. Any deviation in cable impedance, capacitance, or shielding continuity within this signal path directly corrupts the gap voltage output and, by extension, the shaft displacement or position data fed to the machinery protection monitor. This cable eliminates that risk by preserving the factory-defined transmission parameters across its full rated length.

In rotating machinery protection architectures governed by API 670, the extension cable is not a passive conductor — it is a calibrated system element. The 330103 series is manufactured to a defined characteristic impedance of 95 Ω ± 2 Ω, with a nominal capacitance of 13.1 pF/ft (43 pF/m). These values are matched to the Proximitor’s internal oscillator circuit, which operates at approximately 1 MHz. Substituting a non-OEM cable with mismatched capacitance shifts the resonant operating point of the eddy-current driver, introducing a static gap voltage error that cannot be corrected through software scaling alone. The 330103-17-22-10-12-05 eliminates this substitution risk entirely.

The part number suffix encodes the cable’s physical configuration: 17 denotes the armored cable assembly variant; 22 specifies the connector termination style; 10-12 defines the cable length in feet (approximately 5 m); and 05 identifies the temperature rating class. This deterministic naming convention allows maintenance engineers to cross-reference the cable against the original installation drawing without ambiguity.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL transducer system operates on the eddy-current principle: the proximity probe tip generates a high-frequency electromagnetic field (nominally 1 MHz) that induces eddy currents in the observed conductive target. The Proximitor sensor demodulates the resulting impedance change into a DC voltage proportional to the gap distance — typically –200 mV/mil (–7.87 V/mm) within the linear range. The extension cable is the transmission medium for both the RF excitation signal (probe-to-Proximitor direction) and the modulated return signal, making its electrical characteristics a direct determinant of system accuracy.

Impedance Continuity and Reflection Control: The 95 Ω characteristic impedance is maintained along the full cable length through a controlled-geometry coaxial construction. Any impedance discontinuity — caused by a damaged connector, a kinked cable section, or a non-OEM substitute with a different dielectric constant — generates a partial signal reflection. At 1 MHz, even a 5 Ω mismatch at the probe-to-cable junction can introduce a measurable standing wave that shifts the Proximitor’s apparent gap voltage by several millivolts, which translates to a false displacement reading of several micrometers. The 330103-17-22-10-12-05 maintains junction impedance within the factory tolerance to prevent this artifact.

EMC Shielding Architecture: The cable employs a multi-layer shielding strategy. The inner PTFE-insulated center conductor is surrounded by a braided shield, which is in turn enclosed within the stainless steel interlocked armor. The armor serves a dual function: mechanical protection against abrasion and crush loads in turbine bearing pedestals, and a secondary Faraday shield against low-frequency magnetic interference from adjacent motor windings or bus bars. The shield is terminated at the Proximitor end only (single-point grounding), preventing ground loop currents that would appear as 50/60 Hz noise on the gap voltage output.

Thermal Stability of PTFE Dielectric: PTFE has a dielectric constant of approximately 2.1, which is among the most stable of any cable insulation material across the –55 °C to +125 °C operating range. The temperature coefficient of capacitance for PTFE-insulated coaxial cable is typically below ±50 ppm/°C. This stability ensures that the cable’s electrical length does not shift measurably between cold-start and full-load operating conditions, preserving calibration accuracy across the machinery’s thermal cycle without requiring field recalibration.

System Integration Benefits

• Preserved calibration traceability: The 330103-17-22-10-12-05 is manufactured to the same electrical specification used during factory calibration of the 3300 XL Proximitor. Replacing a degraded cable with this OEM part restores the original calibration curve without requiring a new system calibration procedure, reducing maintenance downtime.
• Deterministic gap voltage output: Matched impedance and capacitance ensure the Proximitor’s DC output voltage tracks the probe gap with the specified sensitivity of –200 mV/mil, supporting accurate alarm and trip setpoint enforcement in the 3500 Series monitor.
• Plug-and-play replacement: Connector geometry and pinout are identical to the original factory installation. No adapter, re-termination, or wiring modification is required, eliminating a common source of installation error during cable replacement under time pressure.
• Mechanical protection in bearing pedestal environments: The stainless steel armor withstands the mechanical loads typical of cable routing through turbine bearing pedestals — including vibration, thermal expansion cycling, and incidental contact with maintenance tooling — without compromising the inner coaxial geometry.
• Single-point shield grounding compatibility: The cable’s shield termination design is compatible with the 3300 XL system’s single-point grounding requirement, preventing the introduction of common-mode noise that would degrade the signal-to-noise ratio of the gap voltage measurement.
• API 670 system compliance maintenance: Using a non-OEM cable in an API 670-compliant machinery protection system can void the system’s compliance status. The 330103-17-22-10-12-05 maintains the original bill of materials, preserving the compliance documentation required for insurance and regulatory audits.
• Hazardous area installation integrity: Where the 3300 XL system is installed in ATEX or IECEx-classified zones, the cable’s material and construction specifications are consistent with the system-level hazardous area certification. Substituting a non-certified cable introduces a compliance gap that must be formally assessed before the system can be returned to service.
• Reduced diagnostic ambiguity: A degraded or mismatched extension cable is a known source of false vibration alarms and spurious trip events in eddy-current monitoring systems. Installing a verified OEM cable eliminates the cable as a diagnostic variable, allowing maintenance engineers to focus fault investigation on the probe, Proximitor, or monitor hardware with confidence.

Quality Assurance & Global Logistics

Every unit of the 330103-17-22-10-12-05 supplied through siemensplc.com is sourced from verified supply channels with traceable procurement documentation. Before dispatch, each cable assembly undergoes a structured inspection covering connector integrity, armor continuity, jacket condition, and part number label conformance against the Bently Nevada part marking standard. Functional pre-checks include coaxial continuity verification and shield isolation resistance measurement.

Shipments originate from our warehouse in Xiamen, China, with access to DHL Express, FedEx International Priority, and consolidated sea freight services. In-stock items are typically dispatched within 1–3 business days of order confirmation. Full export documentation — commercial invoice, packing list, and certificate of origin — is provided as standard. HS Code guidance for customs clearance is available upon request. Volume pricing is available for orders of 5 or more units; contact us for a formal quotation.

Contact Information

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