Bently Nevada 330103-00-11-50-02-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330103-00-11-50-02-CN — Eddy-Current Proximity Transducer in Rotating Machinery Protection Loops

The 330103-00-11-50-02-CN is an 8 mm eddy-current proximity transducer manufactured by Bently Nevada as part of the 3300 XL Proximity Transducer System. Within a machinery protection loop, this transducer occupies the first measurement node: it converts the physical gap between its tip and a conductive target surface into a proportional DC voltage, feeding raw displacement data to a Proximitor® sensor and, ultimately, to a 3500-series monitor rack. The signal chain is entirely passive at the probe end — no internal amplification, no active components — which means the transducer’s long-term stability is governed purely by coil geometry, ferrite core permeability, and the dielectric properties of the potting compound. Bently Nevada specifies a scale factor of 7.87 V/mm (200 mV/mil) for this probe family, a figure that remains within ±1% across the rated linear range when the system is assembled with the matched 330130-series extension cable and a 3300 XL Proximitor.

The suffix -00-11-50-02-CN encodes the probe’s physical configuration: 11 mm probe body length, 5.0 m integral cable, standard 2-pin connector, and CN (China) regional compliance marking. This configuration is widely deployed in steam turbine radial bearing monitoring, centrifugal compressor axial position measurement, and pump shaft eccentricity detection — applications where API 670 mandates non-contacting measurement with a minimum frequency response of DC to 10 kHz.

Stock is held at our Xiamen, China facility. Inquiries for quantity, lead time, and datasheet: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

Coil-and-Core Architecture: The 330103-00-11-50-02-CN probe houses a wound coil around a ferrite core, encapsulated in a thermally stable epoxy compound. When energized by the Proximitor’s oscillator circuit (typically 1.0 MHz carrier), the coil generates an alternating magnetic field. As a conductive target enters this field, eddy currents are induced on the target surface, loading the coil and reducing its effective inductance. The Proximitor demodulates this impedance shift into a DC voltage proportional to gap distance. The entire measurement is contactless — mechanical wear is zero, and the probe’s MTBF under continuous operation exceeds 100,000 hours in clean industrial environments.

EMC Design: The integral cable uses a coaxial construction with a braided copper shield terminated at the Proximitor end. This topology provides common-mode rejection of radiated interference from adjacent VFDs, switchgear, and high-current bus bars — a critical requirement in turbine halls where magnetic field densities can exceed 10 A/m. The cable’s characteristic impedance is matched to the Proximitor input to prevent standing-wave reflections that would introduce measurement error at high shaft speeds (above 10,000 RPM, the fundamental vibration frequency approaches 167 Hz, well within the probe’s flat response band).

Thermal Stability: The ferrite core material is selected for low temperature coefficient of permeability (typically <0.1%/°C across the rated range). Combined with the matched extension cable’s low-loss dielectric, the system maintains scale factor accuracy within ±1% from –35°C to +121°C at the cable, and the probe tip itself tolerates bearing housing temperatures up to +177°C — sufficient for most steam turbine bearing pedestals operating at 150°C continuous.

Matched System Dependency: The 330103-00-11-50-02-CN is calibrated as a three-component system: probe + extension cable + Proximitor. Substituting any single element with an unmatched part shifts the scale factor and invalidates the API 670 calibration record. The -CN suffix confirms factory calibration against a standard AISI 4140 steel target; installations using 316 stainless or titanium shafts require a target material correction factor applied at the monitor level.

System Integration Benefits

• Direct API 670 Compliance: The 330103-00-11-50-02-CN meets the transducer requirements of API 670 5th Edition, enabling direct use in machinery protection systems without additional certification overhead. This eliminates the engineering review cycle required for non-standard sensors.
• Drop-In Replacement Compatibility: Pin-for-pin and dimension-for-dimension compatible with existing 3300 XL installations. No mechanical re-machining of probe bosses, no recalibration of the Proximitor, and no monitor configuration changes — maintenance downtime is limited to the physical swap and gap re-setting procedure.
• Deterministic Signal Latency: The passive probe introduces no processing delay. Signal propagation from gap change to Proximitor output is governed only by the oscillator demodulation time constant, typically <1 ms. This preserves the deterministic response required for overspeed and high-vibration trip logic in 3500-series monitors.
• Diagnostic Transparency via OK Relay: When paired with a 3300 XL Proximitor, the system drives an OK relay that de-energizes if the probe output falls outside the –2 VDC to –22 VDC window — indicating cable break, probe short, or excessive gap. This hardware-level diagnostic is visible at the monitor rack without software intervention, reducing fault isolation time from hours to minutes.
• Immunity to Process Fluid Contamination: The IP67-rated probe assembly withstands oil mist, water spray, and light chemical splash. The epoxy encapsulation prevents moisture ingress into the coil winding, maintaining insulation resistance >100 MΩ at 500 VDC — a figure that directly correlates to measurement noise floor.
• Wide Target Material Database: Bently Nevada publishes correction factors for over 40 common shaft alloys. The 330103-00-11-50-02-CN’s calibration data is compatible with this database, allowing the Proximitor’s internal trim to compensate for non-standard target materials without hardware changes.
• Scalable Redundancy Architecture: Two probes mounted 90° apart (X-Y configuration) on the same bearing journal provide full orbital analysis. The 330103-00-11-50-02-CN’s compact 8 mm tip diameter accommodates tight bearing housing geometries where larger probes cannot be installed, enabling redundancy in space-constrained retrofits.
• Long Cable Run Capability: The 5.0 m integral cable, when extended with a matched 330130-series extension cable up to 9.0 m, maintains system accuracy. Total cable length up to 14 m is supported — sufficient to route from bearing housing to a remote junction box in large turbine installations without signal conditioning amplifiers.

Quality Assurance & Global Logistics

Every 330103-00-11-50-02-CN unit dispatched from our Xiamen warehouse is sourced through documented supply channels and inspected against Bently Nevada factory part number, label format, and connector specification before packaging. Inspection records are retained for 36 months and are available to the buyer on request. Units are packed in anti-static foam inserts within double-wall cartons to prevent coil damage from transit shock — a critical precaution given the probe’s wound coil construction.

Logistics from Xiamen, China to major industrial hubs: DHL Express to Europe in 3–5 business days; FedEx International Priority to North America in 4–6 business days; sea freight consolidation available for project quantities exceeding 20 units. All shipments include a commercial invoice, packing list, and certificate of origin. Export classification is confirmed prior to dispatch to ensure compliance with Chinese export regulations and destination country import requirements. The 12-month warranty covers manufacturing defects and is supported by our technical team via email and WhatsApp.

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

Contact Information

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