Bently Nevada 330103-00-16-50-02-00 Proximity Probe – 3300XL Series

Bently Nevada 330103-00-16-50-02-00: 8mm Eddy-Current Proximity Probe in the 3300XL Transducer System

The Bently Nevada 330103-00-16-50-02-00 is a factory-calibrated 8mm eddy-current proximity probe belonging to the 3300XL Proximity Transducer System. Within a machinery protection architecture, this probe functions as the primary sensing element responsible for converting shaft displacement into a proportional DC voltage signal. Its output feeds directly into a paired 3300XL Proximitor sensor, which conditions the signal before transmission to a Bently Nevada 3500 Series monitor rack or equivalent machinery protection system (MPS).

The probe operates on the eddy-current induction principle: a high-frequency oscillator within the Proximitor drives an alternating magnetic field through the probe tip coil. When a conductive target surface — typically a steel or alloy shaft — enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. This amplitude change is demodulated and scaled to produce a linear DC output in the range of −1 VDC to −17 VDC, corresponding to a gap range of 0 to 2.0 mm (0 to 80 mil). The sensitivity is precisely calibrated at 7.87 V/mm (200 mV/mil), consistent with API 670 transducer system requirements for radial vibration and axial position measurement on critical rotating machinery.

The part number suffix encodes the full mechanical configuration: probe cable length of 5.0 m (16 ft), extension cable length of 5.0 m (50 ft total system), standard tip geometry (02), and standard connector type (00). Total system cable length — probe plus extension — must match the Proximitor calibration. Substituting cable lengths without recalibration will shift the output scale factor and introduce measurement error that may not be immediately apparent during commissioning.

This probe is deployed across steam turbines, gas turbines, centrifugal compressors, boiler feed pumps, and large electric motors in oil and gas, power generation, and petrochemical facilities. Its non-contact measurement principle eliminates mechanical wear, making it suitable for continuous, uninterrupted operation across the full machinery lifecycle.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-16-50-02-00 probe coil assembly is encapsulated in a hermetically sealed stainless steel tip, providing mechanical protection against process fluid ingress, abrasive particulates, and chemical exposure common in turbomachinery environments. The coil winding geometry is optimized for the 8mm diameter form factor to maintain a consistent electromagnetic field gradient across the specified linear range, minimizing sensitivity variation caused by target surface curvature or minor shaft runout.

The integral cable — a coaxial construction with low-loss dielectric — is designed to maintain signal integrity over the 5.0 m probe cable run. The coaxial geometry suppresses common-mode electromagnetic interference (EMI) induced by adjacent power cables, variable-frequency drives (VFDs), and high-current bus bars typical in industrial switchgear environments. The cable shield is grounded at the Proximitor end only, preventing ground loop formation that would otherwise introduce 50/60 Hz noise into the measurement signal.

The probe tip’s operating frequency — typically in the range of 1 MHz — is selected to achieve adequate skin depth penetration into standard shaft materials (AISI 4140, 4340 steel) while remaining insensitive to surface oxidation layers of the thickness encountered in normal service. This frequency selection also ensures that the eddy-current field does not penetrate deeply enough to be influenced by subsurface material inhomogeneities, keeping the measurement representative of true surface displacement.

The standard tip configuration (suffix 02) uses a flat-face coil geometry, which provides the widest linear range for a given probe diameter. High-temperature tip variants (suffix 08) use a modified encapsulant rated to higher thermal limits but with a marginally reduced linear range — a trade-off that must be evaluated against the thermal profile of the installation point. For standard turbomachinery bearing housings operating below 150°C, the 02 tip is the appropriate selection.

The probe’s mechanical thread and locknut design allows precise gap setting during installation. The nominal gap for this probe-Proximitor combination is typically set at 1.0 mm (40 mil), placing the operating point at the midpoint of the linear range and providing equal headroom for both inward and outward shaft displacement excursions. Deviation from this gap during installation directly affects the DC bias voltage at the monitor input and must be verified against the Proximitor output specification before commissioning.

System Integration Benefits

• Direct API 670 compliance: The 330103-00-16-50-02-00 meets the transducer system requirements of API Standard 670 (5th Edition) for radial vibration and axial position measurement, enabling use in machinery protection systems without additional calibration or documentation overhead.
• Deterministic signal latency: The eddy-current measurement chain introduces no mechanical hysteresis or contact friction. Signal propagation from shaft displacement to Proximitor output is governed solely by the oscillator demodulation time constant, typically below 1 ms, supporting monitor scan rates required for overspeed and high-vibration trip logic.
• Plug-compatible with 3500 Series monitors: The probe-Proximitor output is directly compatible with Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor modules without signal conditioning adapters, reducing wiring complexity and eliminating potential signal chain error sources.
• Non-contact wear-free operation: Absence of mechanical contact between probe and shaft eliminates wear-related drift in sensitivity over time. Calibration stability over multi-year service intervals is achievable without periodic recalibration, provided the probe tip and target surface remain undamaged.
• Wide thermal operating envelope: The −35°C to +177°C operating range covers bearing housing temperatures encountered in both cold-climate outdoor installations and high-temperature turbine bearing pedestals, without requiring probe heaters or thermal isolation hardware.
• EMI-hardened coaxial cable construction: The integral coaxial cable provides inherent rejection of radiated EMI from adjacent power infrastructure. This is particularly relevant in installations where proximity probes are routed alongside motor drive cables or transformer feeders, where induced noise can corrupt vibration measurements and generate spurious alarms.
• Standardized sensitivity for multi-vendor monitor compatibility: The 200 mV/mil sensitivity is the industry-standard scale factor recognized by most third-party machinery protection monitors. While the probe is calibrated for Bently Nevada 3300XL Proximitors, the output signal is compatible with monitors from other manufacturers that accept this standard sensitivity, provided driver compatibility is verified.
• Traceable factory calibration documentation: Each probe ships with factory calibration data traceable to NIST standards. This documentation supports ISO 17025-aligned maintenance programs and satisfies audit requirements for machinery protection systems in regulated industries including nuclear power, LNG, and offshore oil and gas.
• Modular system architecture: The separation of probe, extension cable, and Proximitor into discrete, replaceable components allows field replacement of a damaged probe without disturbing the extension cable routing or Proximitor mounting — minimizing maintenance downtime on critical machinery.
• Consistent target material response: Factory calibration is performed against AISI 4140 steel targets. For shafts manufactured from alternative alloys (e.g., 17-4PH stainless, Inconel), a material correction factor must be applied. Bently Nevada publishes correction factors for common shaft materials, enabling accurate measurement without field recalibration.

Quality Assurance & Global Logistics

All Bently Nevada 330103-00-16-50-02-00 units supplied by siemensplc.com are sourced as genuine OEM components through verified supply channels. Each unit undergoes incoming inspection covering physical integrity of the probe tip, cable jacket, and connector; continuity and insulation resistance verification of the coaxial cable; and dimensional check of the probe thread and tip geometry. Units with evidence of tip damage, cable kinking, or connector corrosion are rejected prior to listing.

Original manufacturer packaging and documentation are preserved where available. Factory calibration certificates and certificates of conformance are provided upon request and are available for the majority of stock units. Export compliance screening — including EAR and ECCN classification — is completed for all international shipments prior to dispatch.

Shipments originate from our warehouse in Xiamen, China, with access to major international freight carriers including DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard international transit times to Europe, Southeast Asia, and the Middle East are 3–5 business days via express air freight. Sea freight consolidation is available for bulk orders. All shipments are fully insured and tracked from dispatch to delivery confirmation. Customs documentation — including commercial invoice, packing list, and certificate of origin — is prepared in compliance with destination country import requirements to minimize clearance delays.

A 12-month warranty covers all units against manufacturing defects and premature failure under normal operating conditions. Warranty claims are processed with a target response time of 48 hours from receipt of the defective unit.

Contact Information

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