Bently Nevada 330903-00-13-05-02-CN Proximity Transducer System – 3300 XL Series

Bently Nevada 330903-00-13-05-02-CN — 3300 XL 8 mm Eddy-Current Proximity Transducer System for Rotating Machinery Protection

The 330903-00-13-05-02-CN is a complete, factory-configured proximity transducer assembly within the Bently Nevada 3300 XL platform — a product line that has established the de facto measurement standard for shaft radial vibration, axial position, and differential expansion monitoring in continuous-duty rotating machinery. This specific configuration pairs an 8 mm eddy-current probe with a 5-metre armored probe cable and a 2-metre extension cable terminated in a CN-type connector, delivering a total signal path of 7 metres from probe tip to monitor input. The assembly is engineered to interface directly with Bently Nevada 3500 Series monitoring racks without supplementary signal conditioning, and it is fully compatible with System 1 machinery management software for real-time trend analysis and alarm management.

In a typical turbomachinery protection loop, the 330903-00-13-05-02-CN occupies the first stage of the measurement chain: the probe tip is mounted in a bracket positioned 1–2 mm from the shaft surface, the eddy-current field penetrates the shaft material, and the Proximitor driver circuit converts the gap-dependent impedance change into a linear DC voltage output of approximately −18 VDC at mid-range. This voltage is then routed through the extension cable to the 3500/42M Proximitor I/O module, where it is digitised, compared against alarm setpoints, and transmitted to the DCS or safety system via hardwired relay or fieldbus. The deterministic nature of this signal path — with no wireless link, no protocol conversion, and no intermediate A/D stage — is precisely why the 3300 XL remains the preferred sensor for API 670-compliant machinery protection systems in oil and gas, power generation, and petrochemical facilities.

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

Technical Parameters

Hardware Logical Analysis

Eddy-Current Transduction Mechanism: The probe coil, wound on a ferrite core and encapsulated in the stainless steel tip, generates a high-frequency oscillating magnetic field (typically 1.0–1.5 MHz carrier). When a conductive target enters the field, eddy currents are induced on the target surface, loading the coil and reducing its effective inductance. The Proximitor oscillator-demodulator circuit — housed in a separate enclosure at the rack end of the extension cable — detects this impedance shift and outputs a proportional DC voltage. Because the transduction is purely electromagnetic, there is zero mechanical contact with the rotating shaft, eliminating wear-induced drift over the service life of the probe.

EMC Design and Shielding Architecture: The 3300 XL cable assembly employs a triaxial shielding arrangement: an inner shield tied to the Proximitor circuit common, an outer shield grounded at the rack end only, and a drain wire for low-impedance shield termination. This configuration suppresses both capacitively coupled interference (common in variable-frequency drive environments) and magnetically induced noise from adjacent power cables. The result is a signal-to-noise ratio sufficient to resolve shaft displacement changes of less than 2.5 µm in environments with ambient electromagnetic field strengths up to 30 V/m — a requirement explicitly addressed in IEC 61000-4-3 radiated immunity testing.

Thermal Stability and Gap Compensation: The probe coil assembly is thermally compensated to maintain scale factor accuracy within ±1% across the full operating temperature range of −35 °C to +121 °C. This is achieved through a combination of temperature-stable ferrite core material and a matched Proximitor compensation network. In high-temperature applications such as steam turbine bearing housings, where probe body temperatures can approach 100 °C during steady-state operation, this compensation prevents the thermal drift that would otherwise introduce false alarm conditions or mask genuine shaft displacement events.

Cable Impedance Matching and Signal Integrity: The 5-metre probe cable and 2-metre extension cable are manufactured to a controlled characteristic impedance, ensuring that the Proximitor oscillator sees a consistent load regardless of cable routing geometry. Impedance mismatches in proximity transducer cables are a documented source of scale factor error; the matched cable set in the 330903-00-13-05-02-CN eliminates this variable and ensures that the factory-calibrated scale factor of 7.87 V/mm is maintained in the field without recalibration.

System Integration Benefits

• Direct 3500 Rack Compatibility: The 330903-00-13-05-02-CN connects directly to the 3500/42M Proximitor I/O module without adapters or signal conditioners, preserving the factory-calibrated scale factor and eliminating additional failure points in the measurement chain.
• API 670 Compliance Out of the Box: The assembly meets the sensor performance requirements of API Standard 670 (5th Edition) for radial vibration and axial position measurement, satisfying the instrumentation clauses of most oil and gas EPC specifications without additional qualification testing.
• Deterministic Real-Time Response: The analog DC output architecture delivers measurement updates at the Proximitor scan rate (typically 20 kHz sample rate at the 3500 monitor), providing sub-millisecond latency from shaft displacement event to relay output — a critical requirement for overspeed and high-vibration trip functions.
• Diagnostic Transparency via System 1: When integrated with Bently Nevada System 1 software, the transducer output is continuously trended, enabling gap voltage monitoring, scale factor verification, and cable continuity checks without removing the probe from service. Deviations from the nominal −18 VDC mid-range output flag probe or cable degradation before measurement accuracy is compromised.
• Hazardous Area Deployment: ATEX/IECEx certification allows installation in Zone 1 and Zone 2 classified areas (gas groups IIA, IIB) without additional barriers in most configurations, simplifying the instrument loop design for offshore platforms and onshore processing facilities.
• Multi-Parameter Measurement from a Single Probe: A single 330903-00-13-05-02-CN installation can simultaneously provide radial vibration (AC component), shaft average centerline position (DC component), and relative shaft eccentricity data to the 3500 monitor — three diagnostic parameters from one measurement point, reducing the total installed sensor count.
• Long-Term Calibration Stability: The eddy-current transduction principle is inherently drift-free under stable thermal conditions. Field experience across the 3300 XL platform documents scale factor stability within ±2% over 10-year service intervals in clean industrial environments, reducing the frequency and cost of calibration outages.
• Backward Compatibility with Legacy 3300 Racks: The 330903-00-13-05-02-CN is electrically compatible with earlier Bently Nevada 3300 Series monitors, providing a direct replacement path for facilities upgrading from legacy racks to the 3500 platform without requiring simultaneous probe replacement.
• Standardized Spare Parts Management: The CN connector and standardized cable lengths simplify spare parts inventory management for MRO teams. A single assembly covers the majority of bearing housing installation geometries, reducing the number of distinct part numbers required in the warehouse.

Quality Assurance & Global Logistics

Every 330903-00-13-05-02-CN unit supplied by siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) OEM hardware. Units are procured through verified supply channels with full traceability documentation, including manufacturer date codes and batch records where available. Prior to dispatch, each assembly undergoes a structured pre-shipment inspection protocol:

• Visual Inspection: Probe tip geometry, cable jacket integrity, connector pin condition, and OEM labeling are verified against published Bently Nevada physical specifications.
• Electrical Verification: Probe coil DC resistance and insulation resistance are measured and compared against the 3300 XL acceptance criteria documented in the Bently Nevada installation manual.
• Gap Voltage Check: Where test equipment is available, the assembly is energised with a calibrated Proximitor and the output voltage at a known gap distance is recorded to confirm scale factor integrity.
• Documentation Package: A Certificate of Conformance (CoC) and inspection record are available upon request. Customers requiring full material traceability for ASME or API audit purposes should specify this at the RFQ stage.

Logistics are managed from our warehouse in Xiamen, China — a major international freight hub with direct access to DHL Express, FedEx International Priority, UPS Worldwide Express, and consolidated sea freight services to all major ports. Standard export packaging for this assembly uses anti-static foam inserts within a double-wall corrugated carton, with moisture barrier film and desiccant packs for ocean freight shipments. Typical DHL Express transit times from Xiamen: 2–3 business days to Southeast Asia, 3–5 business days to Europe and the Middle East, 4–6 business days to North America. All shipments are accompanied by a commercial invoice, packing list, and country-of-origin certificate. Export classification and HS code documentation are prepared in compliance with Chinese customs regulations and the destination country’s import requirements.

A 12-month warranty against manufacturing defects applies to all units from the date of shipment. Warranty claims are processed through our technical team; defective units are replaced or credited following inspection. This warranty does not cover damage resulting from incorrect installation, operation outside published specifications, or physical impact.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.

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