Bently Nevada 330103-00-16-10-02-CN Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-16-10-02-CN — 8 mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring

The Bently Nevada 330103-00-16-10-02-CN is an 8 mm eddy-current proximity probe engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in rotating machinery protection systems. Operating within the 3300 XL Proximitor® architecture, this probe forms the sensing front-end of a factory-calibrated three-component system — probe, extension cable, and driver — where each element is matched at manufacture to maintain traceable output linearity across the full sensing range. The CN suffix designates a Chinese-standard connector configuration, eliminating field adapter requirements in domestic installations and reducing termination error risk at the junction box.

In a machinery protection loop, the proximity probe occupies the most mechanically exposed position: mounted within millimeters of a rotating shaft, subject to lubricant contamination, thermal cycling, and mechanical vibration transmitted through the probe body itself. The 330103 addresses this environment through a hermetically sealed probe tip, a stainless-steel housing threaded M10×1 for positive locknut retention, and an integral 5 m (16 ft) cable rated for continuous flexure. The eddy-current sensing element generates a high-frequency oscillating magnetic field; shaft proximity modulates the field loading, and the Proximitor® driver converts this impedance variation into a DC voltage output proportional to gap distance. No moving parts, no contact wear, and no lubrication requirements make this measurement principle inherently suited to 24/7 continuous duty in turbine, compressor, and pump trains.

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Technical Parameters

Hardware Logical Analysis

The 330103 probe operates on the Lenz’s law induction principle. An internal oscillator within the matched Proximitor® driver — not within the probe body itself — drives a resonant LC tank circuit whose inductive element is the probe coil. As the conductive shaft target approaches the probe face, eddy currents induced in the target surface extract energy from the tank circuit, reducing its Q-factor and shifting the oscillation amplitude. The Proximitor® demodulates this amplitude variation and outputs a calibrated DC voltage. This architecture places all active electronics in the driver, which is mounted in a protected instrument enclosure, while the probe body contains only passive coil windings encapsulated in a ceramic-filled epoxy matrix — a deliberate design choice that maximizes probe reliability in high-temperature, high-vibration zones.

EMC performance is achieved through coaxial cable construction with a continuous foil-braid shield referenced to the driver chassis ground, suppressing common-mode interference from variable-frequency drives, high-current bus bars, and RF sources common in industrial environments. The CN connector’s metal shell provides 360° shield continuity at the termination point, a detail that matters in installations where cable routing passes near power conductors. The M10×1 thread pitch provides fine positional adjustment — each full rotation shifts the probe face 1 mm — enabling precise gap setting to the nominal 1.27 mm (50 mil) center-of-range operating point without requiring shim stock or custom spacers. A locknut torqued to specification prevents gap drift under vibration, maintaining measurement baseline stability over extended operating intervals between scheduled outages.

System Integration Benefits

• Factory-matched calibration traceability: The probe, extension cable, and 3300 XL Proximitor® driver are calibrated as a system against NIST-traceable standards. Substituting any single component with an unmatched part invalidates the calibration chain and introduces non-linearity errors that are not detectable without a full system recalibration.
• API 670 compliance for regulated facilities: The 330103 meets the machinery protection standard required by most petrochemical, LNG, and power generation operators. Procurement teams can reference this compliance directly in equipment qualification documentation without additional third-party testing.
• Deterministic output latency: The eddy-current measurement chain introduces no mechanical hysteresis or contact bounce. Combined with the 3500 series monitor’s 4 ms update rate, the system delivers deterministic vibration data suitable for trip logic with sub-cycle response to shaft excursions.
• Diagnostic transparency via System 1: When integrated with Bently Nevada System 1 software, the probe’s gap voltage is logged continuously alongside vibration amplitude and phase. Slow gap drift — indicating bearing wear or thermal growth — is distinguishable from dynamic vibration events, enabling condition-based maintenance scheduling rather than fixed-interval outages.
• CN connector standardization: The -CN suffix eliminates the BNC-to-CN field adapter used in many legacy installations. Removing this adapter reduces one potential failure point in the signal path and simplifies cable routing in junction boxes where space is constrained.
• Wide operating temperature margin: The −35 °C to +177 °C rating covers both outdoor installations in northern climates during winter startup and probe positions adjacent to hot bearing housings on steam turbines. No derating is required within this range.
• Non-contact measurement eliminates wear-based drift: Unlike contact-type displacement sensors, the eddy-current probe has no mechanical wear mechanism. Calibration stability over a 5-year operating interval is achievable in clean installations, reducing recalibration frequency and associated outage costs.
• Interchangeable within matched spare sets: Provided the extension cable and driver are retained from the original calibrated set, a replacement 330103 probe of the same part number can be installed and the system returned to service without full recalibration — only a gap reset and functional verification are required, reducing outage duration.

Quality Assurance & Global Logistics

Every 330103-00-16-10-02-CN unit supplied through siemensplc.com is sourced through verified distribution channels with full documentation traceability. Each shipment includes a Certificate of Conformance (CoC) referencing the original manufacturer’s part number and revision level, original manufacturer packaging where available, and a pre-shipment inspection report covering visual condition, connector integrity, and cable continuity. Serial numbers are cross-referenced against Bently Nevada records where applicable to confirm authenticity.

Logistics operations are based in Xiamen, China — a major export hub with direct access to international freight forwarders serving North America, Europe, Southeast Asia, the Middle East, and Australia. In-stock units are dispatched within 1–3 business days via DHL Express, FedEx International Priority, or UPS Worldwide, with full export documentation including commercial invoice, packing list, and HS code 9031809090. For project quantities or blanket purchase orders, consignment stock arrangements and dedicated freight consolidation are available on request. All shipments are insured against transit damage, and replacement or credit procedures are initiated within 48 hours of a confirmed damage claim.

Contact Information

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