Bently Nevada 330104-05-09-50-02-CN Proximity Transducer – 3300 XL Series

330104-05-09-50-02-CN: 8 mm Eddy-Current Proximity Transducer in Rotating Machinery Protection Loops

The Bently Nevada 330104-05-09-50-02-CN is an 8 mm diameter, non-contact eddy-current proximity probe configured with a 5-metre integral cable, a 9-metre extension cable, 50 Ω system impedance, and CN-variant certification. It operates as the sensing element within the Bently Nevada 3300 XL three-component transducer system, delivering calibrated DC voltage output proportional to the radial gap between probe tip and rotating target shaft. In a machinery protection architecture, this module occupies the first stage of the signal chain — converting mechanical displacement into an analogue voltage that monitor racks (3300/16, 3300/20, 3500/40M through 3500/46M) process against API 670-defined alert and danger thresholds.

The probe body is wound with a precision coil driven by a high-frequency oscillator embedded in the companion 3300 XL 8 mm Driver (Proximitor®). When the conductive target surface enters the electromagnetic field, eddy currents are induced, loading the oscillator circuit. The driver converts this impedance change into a linear DC output spanning –2.0 VDC at 0.25 mm gap to –10.4 VDC at 2.25 mm gap, yielding a scale factor of 7.87 V/mm (200 mV/mil). This deterministic transfer function is the foundation of all downstream vibration amplitude, phase, and position calculations performed by the monitor rack.

The -CN suffix designates the China national certification variant. Electrically and mechanically, the unit is identical to the -00 (standard) variant; the suffix reflects pre-approval under Chinese domestic regulatory frameworks, eliminating the need for additional field certification during commissioning on domestic projects. This distinction is operationally significant for EPC contractors and plant owners managing regulatory compliance timelines in Chinese petrochemical, power generation, and heavy industrial facilities.

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Technical Parameters

Hardware Logical Analysis

The 330104-05-09-50-02-CN operates within a three-node signal chain: probe → extension cable → driver. Each node has defined impedance characteristics that must be maintained as a matched system. The 50 Ω system impedance designation (the fourth numeric field in the part number) specifies the combined probe-plus-extension cable impedance presented to the driver input. Substituting cables or probes from a different impedance class — even within the 3300 XL family — will shift the oscillator operating point, introducing a static offset error and compressing the linear range. This is a common field error that manifests as a non-zero gap reading at the calibrated zero-gap reference point.

The integral cable design (5 m, factory-terminated) eliminates the field-splice junction that is the primary failure mode in discrete-cable probe assemblies. Splice junctions introduce parasitic capacitance and resistance that alter the effective system impedance, degrade frequency response at the high end of the 10 kHz bandwidth, and create moisture ingress paths in humid or wash-down environments. By integrating the cable into the probe body at the factory, Bently Nevada maintains the calibrated impedance from tip to connector under all operating conditions.

EMC performance is governed by the coaxial cable geometry and the driver’s differential input architecture. The coaxial shield is grounded at the driver end only (single-point grounding), preventing ground-loop currents from coupling into the signal conductor. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or switchgear rooms — this single-point shield termination is the primary mechanism suppressing common-mode interference. The driver’s internal oscillator operates at a frequency well above the industrial EMI band (typically 1–2 MHz carrier), placing the signal carrier outside the 50/60 Hz and harmonic interference spectrum. Demodulation at the driver output recovers the gap-proportional DC component with the carrier and interference rejected.

The probe tip geometry — 8 mm diameter — determines the effective sensing field diameter, which is approximately 2× the probe diameter (16 mm). This field diameter sets the minimum shaft diameter for accurate measurement (shaft OD must exceed 50 mm for full linearity) and the maximum acceptable shaft surface finish variation. Shafts with surface roughness exceeding Ra 1.6 μm or with keyways, holes, or weld seams within the sensing zone will produce once-per-revolution electrical runout that must be subtracted from the total runout measurement per API 670 Section 5.4.

System Integration Benefits

• Drop-in OEM Replacement: The 330104-05-09-50-02-CN is a direct, part-number-traceable replacement for any 3300 XL 8 mm / 5 m / 9 m / 50 Ω system. No recalibration of the monitor rack is required when replacing a like-for-like unit, reducing planned maintenance downtime to the physical swap interval.
• API 670 Table 1 Compliance: The probe system meets the transducer accuracy requirements of API 670 Fifth Edition, including ±0.5% full-scale linearity and ±1% sensitivity tolerance, enabling direct use in machinery protection systems without supplementary accuracy qualification.
• 10 kHz Bandwidth for Sub-synchronous Detection: The flat frequency response from DC to 10,000 Hz captures sub-synchronous instability (oil whirl, surge precursors), synchronous 1× imbalance, and super-synchronous blade-pass frequencies in a single channel, eliminating the need for parallel sensor channels at different bandwidths.
• DC-coupled Output for Axial Position: The DC-coupled output allows the same probe to measure both dynamic vibration (AC component) and static axial position (DC component) simultaneously. Monitor racks extract both components from the single output wire, reducing sensor count and cable routing complexity in thrust bearing monitoring applications.
• CN Certification for Domestic Regulatory Compliance: Pre-certified for Chinese national standards, the -CN variant eliminates the 4–8 week field certification process required for non-CN variants in regulated Chinese facilities, directly compressing project commissioning schedules.
• Serialized OEM Traceability: Each unit carries a Bently Nevada serial number enabling full manufacturing traceability. This satisfies insurance underwriter requirements, ISO 55000 asset management documentation standards, and plant owner audit trails without additional third-party certification.
• Broad Monitor Compatibility: Compatible with both the legacy 3300 series and the current 3500 series monitor platforms, the probe system supports mixed-generation rack architectures common in brownfield plant expansions where new 3500 racks are installed alongside existing 3300 infrastructure.
• Non-Contact Operation for Continuous Duty: Zero mechanical contact between probe and shaft means zero wear-induced drift over the service life. In continuous-process plants operating 8,000+ hours per year between turnarounds, this eliminates the sensor replacement interval that contact-type sensors require, reducing lifecycle maintenance cost per measurement point.
• Moisture and Chemical Resistance: The probe body and integral cable are rated for direct exposure to process fluids, lubricating oils, and cleaning solvents typical of compressor and turbine bearing housings, without requiring additional protective conduit over the integral cable run.

Quality Assurance & Global Logistics

Every 330104-05-09-50-02-CN unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification protocol. Visual inspection confirms probe tip integrity, cable jacket condition, and connector pin geometry. Dimensional verification checks probe body thread form (M10×1 standard) and tip-to-shoulder length against OEM drawings. Functional bench testing applies –24 VDC excitation and verifies output voltage at two reference gap distances (0.5 mm and 2.0 mm) against the published scale factor of 7.87 V/mm, with acceptance tolerance of ±2%. Units failing any criterion are quarantined and not dispatched.

Packaging follows anti-static and moisture-barrier protocols: the probe assembly is wrapped in anti-static foam, sealed in a moisture-barrier polyethylene bag with desiccant, and placed in a rigid carton with void fill to prevent transit shock. For international shipments, the outer carton is marked with the HS code, country of origin (United States), and Bently Nevada part number for customs clearance efficiency.

Logistics from Xiamen operate via DHL Express, FedEx International Priority, and UPS Worldwide Express. Standard transit times: 2–3 business days to Southeast Asia, 3–5 business days to Europe and the Middle East, 4–6 business days to North America. Trade terms available: EXW Xiamen, FOB Xiamen, CIF destination port. For urgent plant-down situations, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST.

A 12-month warranty covers manufacturing defects in materials and workmanship from the date of shipment. Warranty claims are processed with return merchandise authorization (RMA) within 2 business days of defect notification. Replacement units are dispatched from stock upon RMA approval, minimizing plant exposure time.

Contact Information

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