Bently Nevada 330103-10-15-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330103-10-15-10-02-05 — Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330103-10-15-10-02-05 is a 5 mm eddy-current proximity probe from the 3300 XL Series, designed for continuous non-contact measurement of shaft radial vibration, axial position, and differential expansion in safety-critical rotating equipment. The part number encodes the complete mechanical and electrical configuration: 10-inch probe body, 15-foot armored extension cable, 10-32 UNF thread, 5 mm tip diameter, and MIL-C-5015 02-05 bayonet connector. Each parameter is factory-set and traceable to Bently Nevada calibration standards, making this assembly a direct drop-in for API 670-compliant machinery protection systems without field recalibration.

Deployment environments span steam and gas turbines, centrifugal and axial compressors in petrochemical trains, hydro turbines, large pump-motor sets, and marine propulsion shafting. The probe operates as the primary sensing element in a three-component loop: probe body → extension cable → Proximitor® driver (330180-X-05 or equivalent). Output is a DC-biased analog voltage whose deviation from the –10.5 VDC nominal gap voltage is linearly proportional to shaft displacement at a scale factor of 200 mV/mil (7.87 V/mm). This signal feeds directly into 3500/40M, 3500/42M, or 3500/44M monitor modules for alarm and trip processing per API 670 voting logic.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL probe operates on the Lenz-law eddy-current principle. A high-frequency oscillator within the Proximitor driver (typically 1.0 MHz carrier) drives a resonant LC tank circuit whose inductive element is the probe coil wound on a ferrite core inside the 316L stainless-steel tip. When a conductive target enters the electromagnetic field, eddy currents are induced on the target surface, loading the tank circuit and reducing its Q-factor. The Proximitor demodulates this amplitude change into a DC voltage proportional to gap distance.

EMC and Shielding Architecture: The 15-foot armored cable uses a triaxial construction — inner signal conductor, PTFE dielectric, inner shield (driven at guard potential by the Proximitor), and outer stainless-steel braid at chassis ground. The driven-guard topology eliminates cable capacitance from the measurement loop, preserving the 10 kHz bandwidth even at full 15-foot cable length. This is critical in high-EMI environments such as variable-frequency drive (VFD) motor rooms and switchgear rooms where radiated interference can exceed 10 V/m.

Thermal Stability: The probe coil is wound with a temperature-compensated wire alloy, and the ferrite core material is selected for low permeability drift across the –35 °C to +177 °C range. Scale factor deviation across the full temperature range is specified at ±0.5% of reading, which is within the API 670 allowable measurement uncertainty budget of ±5% full-scale.

Mechanical Robustness: The 10-32 UNF thread and 316L housing are rated for continuous immersion in turbine lube oil, steam condensate, and process gas atmospheres. The MIL-C-5015 bayonet connector provides IP67 sealing when mated and resists vibration-induced loosening at acceleration levels up to 50 g (IEC 60068-2-6, Test Fc). The stainless-steel cable armor provides crush resistance and protects against abrasion in cable trays shared with power conductors.

Calibration Traceability: Each probe-cable assembly is factory-calibrated as a matched set against a 4140 steel target on a precision gap fixture. The calibration record includes scale factor, bias voltage at nominal gap, and linearity deviation across the full gap range. This data is encoded in the assembly serial number and retrievable from Bently Nevada’s calibration database, supporting ISO 9001 and ASME PTC 19.22 measurement uncertainty documentation requirements.

System Integration Benefits

• Zero-Calibration Commissioning: Factory-matched probe and cable ship as a calibrated assembly. The 3500 monitor accepts the 200 mV/mil scale factor as a standard input; no field calibration fixture or signal generator is required at startup, reducing commissioning time by approximately 2–4 hours per measurement point.
• API 670 Voting Logic Compatibility: The analog output is fully compatible with 2oo3 (two-out-of-three) and 1oo2 (one-out-of-two) voting architectures in the 3500 rack. Redundant probe pairs on the same journal can be wired to separate monitor channels without signal interaction, supporting SIL 2 machinery protection loops.
• Deterministic Frequency Response: The DC-to-10 kHz bandwidth captures shaft vibration components from slow-roll (sub-1 Hz) through high-frequency blade-pass events (typically 1–5 kHz for industrial turbomachinery), enabling full spectral analysis without anti-aliasing concerns at standard 3500 monitor sampling rates.
• Diagnostic Transparency via Gap Voltage: The DC bias output provides a continuous, real-time indication of probe-to-shaft gap. Operators can detect probe fouling, shaft wear, or mounting bracket loosening by trending the DC level — a capability absent in accelerometer-based systems that measure only AC vibration.
• Non-Contact Operation Eliminates Wear: Unlike contact-type displacement transducers, the eddy-current probe introduces no mechanical load on the shaft and has no moving parts. Mean time between failure (MTBF) for the probe assembly exceeds 200,000 hours in clean lube-oil environments, reducing planned maintenance intervals and unscheduled outage risk.
• Plug-Compatible with Legacy 3300 Installations: The 3300 XL series maintains backward electrical compatibility with the original 3300 series Proximitor drivers and 3500 monitor modules. Existing probe bosses machined to 10-32 UNF accept this assembly without re-machining, protecting capital investment in existing machinery pedestals.
• Standardized Spare Parts Inventory: The 330103-10-15-10-02-05 configuration (10 in probe, 15 ft cable, 5 mm tip, 02-05 connector) is the most widely deployed variant in refinery and power-generation applications. Stocking a single part number covers the majority of radial vibration measurement points in a typical 3500-based protection system, simplifying spare parts management.
• Integrated Fault Detection: The 3500 monitor continuously checks the probe circuit for open-circuit (gap voltage near 0 VDC) and short-circuit (gap voltage near –24 VDC) conditions. A fault on any channel triggers a configurable alert without requiring manual inspection, supporting continuous online monitoring per API 670 Section 5.4.

Quality Assurance & Global Logistics

Every 330103-10-15-10-02-05 unit dispatched from our Xiamen, China facility is a genuine Bently Nevada (Baker Hughes) original part sourced through verified industrial supply channels. Incoming inspection covers physical integrity of the probe tip and cable armor, connector pin continuity and insulation resistance (≥100 MΩ at 500 VDC), and scale-factor spot-check against the factory calibration record. Units that do not meet specification are quarantined and returned — no refurbished or repaired assemblies are offered as new stock.

Packaging follows IEC 60068-2-27 shock-protection guidelines: the probe assembly is individually wrapped in anti-static foam, secured in a rigid inner carton, and placed in a double-wall corrugated outer box rated for 200 kg/cm² edge crush. This packaging survives standard air-freight handling without probe tip damage or cable kinking.

Logistics from Xiamen Gaoqi International Airport (XMN) to major industrial hubs: DHL Express to Houston (IAH) in 3–5 business days; to Rotterdam (RTM) in 4–6 business days; to Singapore (SIN) in 2–3 business days. All shipments include commercial invoice, packing list, and certificate of origin. Export classification is EAR99 (no export license required for most destinations). Customs HS code 9031.80 applies. Urgent same-day dispatch is available for orders confirmed before 14:00 CST.

All units carry a 12-month warranty from the date of shipment, covering manufacturing defects and calibration drift beyond ±2% of the factory scale factor. Warranty claims are processed within 5 business days with advance replacement shipping to minimize equipment downtime.

Contact Information

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