Bently Nevada 330103-00-06-05-02-CN Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-06-05-02-CN — 8mm Eddy Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330103-00-06-05-02-CN is a non-contact eddy current proximity probe engineered for continuous shaft vibration, radial position, and eccentricity measurement in high-speed rotating machinery. Operating as a matched component within the 3300 XL 8mm Proximity Transducer System, this probe delivers a calibrated output of 200 mV/mil across a linear measurement range of 10–90 mil (0.25–2.29 mm), with a flat frequency response from DC to 10,000 Hz — characteristics that make it the reference standard for API 670-compliant machinery protection systems in turbines, compressors, and pumps across oil & gas, power generation, and petrochemical sectors.

The probe body is threaded M10 × 1.0 with an 8 mm active tip diameter. The integral cable assembly is 5 ft (1.5 m), terminated with a CN-type coaxial connector for direct mating with Bently Nevada 330130-series extension cables and 3300/3500-series Proximitor drivers. Factory calibration is performed against AISI 4140 steel targets per API 670 Annex D procedures, with correction factors documented for stainless steel, titanium, and other common shaft alloys.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-06-05-02-CN operates on the principle of high-frequency eddy current induction. The probe tip houses a precision-wound coil driven by an oscillator circuit within the paired Proximitor driver at a carrier frequency typically between 500 kHz and 2 MHz. When the conductive target (shaft) enters the probe’s electromagnetic field, eddy currents are induced on the target surface, loading the coil and reducing its impedance. The Proximitor demodulates this impedance change into a DC voltage proportional to the gap distance at 200 mV/mil — a linear, temperature-stable relationship across the rated operating range.

EMC Design: The coaxial CN connector and shielded integral cable form a continuous Faraday enclosure from probe tip to driver input, attenuating common-mode electromagnetic interference generated by variable-frequency drives, high-current bus bars, and adjacent instrumentation. The cable shield is grounded at the driver end only, eliminating ground loop currents that would otherwise introduce 50/60 Hz noise into the vibration signal chain.

Thermal Stability: The probe body is constructed from 316 stainless steel with a ceramic-filled epoxy potting compound encapsulating the coil assembly. This combination maintains coil geometry and dielectric properties across the full −35°C to +177°C operating envelope, limiting thermal sensitivity error to less than ±0.5% of full-scale output — a critical parameter in steam turbine bearing housings where ambient temperatures fluctuate by 80–120°C during load transients.

Matched System Calibration: Unlike generic eddy current sensors, the 330103 probe is factory-characterized as a three-component system: probe + extension cable + Proximitor driver. The calibration data is encoded in the Proximitor’s internal resistor network, ensuring that the 200 mV/mil sensitivity is maintained regardless of cable capacitance variation across the rated length range. Substituting any single component without re-characterization introduces a systematic gain error that cannot be corrected by gap adjustment alone.

Hazardous Area Architecture: The probe’s passive electrical architecture — no active components in the field device — simplifies ATEX/FM intrinsic safety barrier design. The Proximitor driver incorporates the energy-limiting circuitry, allowing the probe itself to be installed in Zone 1 / Division 1 environments without additional field barriers, reducing installation hardware cost and wiring complexity in offshore and refinery applications.

System Integration Benefits

• Direct API 670 compliance: The 330103-00-06-05-02-CN is listed as a qualified component in API 670 5th Edition machinery protection system designs, eliminating the engineering review burden associated with non-standard sensor substitutions during plant audits.
• Zero-configuration drop-in replacement: Within an existing 3300 XL system, replacing a worn probe with an identical 330103 unit requires only a gap voltage check at installation — no driver reconfiguration, no monitor re-ranging, and no DCS scaling changes.
• Deterministic signal latency: The DC-coupled output path from probe to Proximitor to monitor introduces less than 1 ms of signal latency, preserving the phase accuracy required for synchronous vibration analysis (1X, 2X Bode plots) and machinery balancing procedures.
• Diagnostic transparency: The Proximitor’s OK relay output provides a continuous hardware-level health signal. A gap voltage outside the 10–90 mil linear range drives the OK output low within 50 ms, enabling the 3500 monitor to generate a Not-OK alarm before vibration amplitude thresholds are reached — a first-principle fault detection mechanism independent of software watchdogs.
• Multi-variable measurement from a single installation: One probe installation simultaneously provides shaft radial vibration (dynamic AC component), average shaft centerline position (DC component), and eccentricity (slow-roll vector) — three independent condition monitoring parameters from a single cable penetration through the bearing housing.
• Compatibility with 3500 Series digital monitors: The analog output is directly compatible with the 3500/42M Proximitor I/O module’s differential input, supporting both 4–20 mA retransmission and direct Modbus/OPC-UA data export to plant DCS and historian systems without signal conditioning hardware.
• Long-term spare parts availability: The 3300 XL platform has been in continuous production since the 1990s. Bently Nevada maintains backward compatibility across probe generations, protecting the capital investment in existing monitor racks and wiring infrastructure for the operational life of the plant.
• Reduced commissioning risk in greenfield projects: Specifying the 330103-00-06-05-02-CN as the standard proximity probe across all rotating equipment in a new facility standardizes calibration procedures, spare parts inventory, and technician training — measurably reducing commissioning schedule risk and long-term maintenance overhead.

Quality Assurance & Global Logistics

Every Bently Nevada 330103-00-06-05-02-CN unit supplied by siemensplc.com is sourced through verified authorized distribution channels with full OEM traceability documentation. Prior to dispatch from our Xiamen, China facility, each unit undergoes a structured pre-shipment inspection protocol: visual examination of probe body and connector integrity, cable continuity and shield resistance verification, and cross-check of serial number against manufacturer documentation. Original OEM packaging is preserved where available; all units are shipped in anti-static, moisture-barrier packaging with desiccant inserts to protect the coil assembly during international transit.

A 12-month warranty covers manufacturing defects from the date of shipment. Calibration certificates are available upon request for new OEM units. Our logistics team in Xiamen operates daily dispatch cycles with DHL Express, FedEx International Priority, and UPS Worldwide Express — typical transit times of 3–5 business days to Europe, 2–4 days to Southeast Asia, and 4–7 days to North America. Sea freight consolidation is available for bulk orders exceeding 50 units. All shipments include commercial invoice, packing list, and certificate of origin documentation to support customs clearance in regulated markets.

For projects requiring expedited delivery or in-country stocking arrangements, contact our technical sales team to discuss consignment inventory and bonded warehouse options.

Contact Information

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