Bently Nevada 330103-00-11-50-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-11-50-02-05 — 8 mm Eddy-Current Proximity Probe for High-Speed Rotating Machinery

The 330103-00-11-50-02-05 is a non-contact, eddy-current proximity probe manufactured by Bently Nevada as part of the 3300 XL measurement system. It is designed for continuous shaft radial vibration, axial position, and differential expansion measurement on critical rotating machinery operating in industrial and hazardous environments. The probe operates on the eddy-current induction principle: a high-frequency oscillator within the driver circuit energizes the probe coil, generating an electromagnetic field at the probe tip. When a conductive target surface enters this field, eddy currents are induced, loading the oscillator and producing a proportional DC voltage output that represents the physical gap between probe tip and shaft surface with sub-micron resolution.

This model is specified for machinery protection systems governed by API 670 (5th Edition) and is deployed across steam turbines, gas turbines, centrifugal compressors, axial compressors, large pumps, gearboxes, and expanders in petrochemical, LNG, power generation, refining, and marine propulsion sectors. The 8 mm tip diameter makes it the preferred choice for compact bearing housings where 11 mm or 25 mm probes cannot be physically accommodated.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-11-50-02-05 operates within a three-component measurement loop: probe, extension cable, and Proximitor driver. The probe coil is wound on a ferrite core and encapsulated in a thermally stable polymer tip. The oscillator in the Proximitor driver — typically the 3300 XL 8 mm Proximitor Sensor (part 330180-X1-05) — runs at approximately 1.0 MHz carrier frequency. This frequency is selected to maximize eddy-current penetration depth in AISI 4140 steel while maintaining adequate bandwidth for the DC–10,000 Hz measurement range required by API 670 for machinery operating at speeds from 600 RPM to beyond 60,000 RPM.

Electromagnetic Compatibility (EMC) Architecture: The integral cable uses a double-shielded, armor-jacketed coaxial construction. The inner shield provides a low-impedance return path for the RF carrier signal, while the outer armor provides mechanical protection and a secondary Faraday shield against externally coupled interference from variable-frequency drives (VFDs), high-current bus bars, and motor starters common in industrial environments. The shield is grounded at the Proximitor end only (single-point grounding) to prevent ground-loop currents from introducing noise into the measurement signal.

Thermal Drift Compensation: The probe tip encapsulant and coil winding material are selected for matched thermal expansion coefficients. Over the operating range of −35 °C to +177 °C, sensitivity drift is maintained within ±0.5% of nominal 7.87 V/mm, ensuring that temperature excursions in hot-section turbine environments do not introduce false alarm conditions in the protection monitor.

Cable Length Calibration Dependency: The Proximitor driver is factory-calibrated for a specific total cable length (probe integral cable + extension cable). The 02 extension code in this part number designates a 2 m extension, yielding a 7.0 m total system length. Substituting a different extension cable length without recalibrating the driver will shift the output voltage curve and introduce a systematic measurement error proportional to the cable impedance mismatch. This is a critical installation constraint that field engineers must verify during commissioning.

Target Material Sensitivity: The eddy-current field depth and sensitivity are functions of target material conductivity and permeability. The 7.87 V/mm sensitivity is calibrated for AISI 4140 steel. Shafts manufactured from stainless steel (e.g., 316L), titanium alloys, or Inconel will produce different output voltages at the same physical gap. Bently Nevada provides material correction factors; these must be applied during system calibration when non-standard shaft materials are present.

System Integration Benefits

• API 670 Compliance Out of the Box: The 330103-00-11-50-02-05 meets all probe performance requirements of API 670 (5th Edition) without additional field calibration, reducing commissioning time on EPC projects where third-party witness testing is mandatory.
• Backward Compatibility with 3300 Series Infrastructure: The 3300 XL probe is electrically and mechanically compatible with existing 3300 series Proximitor drivers and monitor cards, allowing direct replacement in installed systems without rewiring or monitor reconfiguration.
• Deterministic Real-Time Response: The DC–10,000 Hz flat frequency response ensures that sub-synchronous instabilities (oil whirl at 0.43–0.48×), synchronous unbalance (1×), and super-synchronous blade-pass frequencies are all captured within a single measurement channel, eliminating the need for parallel sensor arrays on most turbomachinery applications.
• Hazardous Area Deployment: ATEX/IECEx Zone 1 certification allows installation in gas-processing and refinery environments classified as continuously explosive atmospheres, with no requirement for additional intrinsic safety barriers when paired with the certified Proximitor driver.
• High-Temperature Tolerance: The 177 °C probe tip rating covers the bearing housing temperatures encountered on high-pressure steam turbines and hot-gas expanders, where competing 8 mm probes rated to 120 °C require heat-shielding fixtures that introduce installation complexity.
• Diagnostic Transparency via Voltage Output: The −1 VDC to −21 VDC output range provides a direct, linear representation of gap distance that can be monitored by any DCS analog input card without signal conditioning, enabling continuous gap trending and early detection of bearing wear before vibration amplitude thresholds are reached.
• Low Cross-Axis Sensitivity: The 8 mm tip geometry and coil winding pattern minimize sensitivity to shaft axial movement when the probe is installed in the radial orientation, reducing measurement crosstalk in applications where axial float is present.
• Scalable to Redundant Architectures: Two probes installed 90° apart (X–Y configuration) per API 670 provide full shaft orbit reconstruction. The matched sensitivity of 3300 XL probes within a production batch ensures that orbit plots are geometrically accurate without per-channel gain correction in the monitor.

Quality Assurance & Global Logistics

Every unit of the 330103-00-11-50-02-05 supplied through siemensplc.com is sourced from verified Bently Nevada (Baker Hughes) authorized distribution channels or factory-direct surplus with full chain-of-custody documentation. Pre-shipment verification includes visual inspection against OEM dimensional drawings, label and date-code authentication cross-referenced against Bently Nevada production records, functional sensitivity verification (output voltage vs. calibrated gap fixture), and anti-static packaging with humidity indicator card and desiccant.

A Certificate of Conformance (CoC) is available on request for all orders. For projects requiring third-party inspection or witnessed testing, we coordinate with SGS, Bureau Veritas, and TÜV-accredited inspection bodies.

Shipments originate from our warehouse in Xiamen, China. Standard export transit times are 3–7 business days to Southeast Asia, 5–10 business days to the Middle East and Europe, and 7–14 business days to the Americas, via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. For shutdown-critical orders, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST. We handle all export documentation including commercial invoice, packing list, certificate of origin, and EAR99 classification confirmation for customs clearance.

Contact Information

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