Bently Nevada 330104-02-12-05-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330104-02-12-05-02-00 — 3300 XL 8mm Eddy-Current Proximity Transducer in Rotating Machinery Protection

The Bently Nevada 330104-02-12-05-02-00 is a three-component eddy-current proximity transducer system belonging to the 3300 XL 8mm product family. It consists of a probe, a 5-metre extension cable, and an externally mounted driver (proximitor). The system delivers a continuous DC voltage output proportional to the physical gap between the probe tip and a conductive target surface, enabling non-contact, wear-free measurement of shaft radial vibration, axial thrust position, differential expansion, and eccentricity in turbomachinery and rotating equipment.

Within a machinery protection architecture, this transducer occupies the first stage of the signal chain: it converts mechanical displacement into a calibrated analogue voltage at a scale factor of 7.87 V/mm (200 mV/mil). That signal feeds directly into Bently Nevada 3500-series monitor racks or 3300 XL drivers, where it is conditioned, compared against alarm setpoints, and logged for trend analysis. The accuracy and repeatability of this first-stage conversion determine the integrity of every downstream protection decision — making the selection of a factory-calibrated, series-matched transducer non-negotiable in API 670-governed installations.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL 8mm system operates on the principle of high-frequency electromagnetic induction. The probe coil, driven by an oscillator circuit inside the proximitor at approximately 1 MHz, generates an alternating magnetic field at the probe tip. When a conductive target enters this field, eddy currents are induced on the target surface, loading the oscillator and reducing the coil’s effective impedance. The proximitor’s demodulation stage converts this impedance change into a proportional DC voltage output — a process that is inherently immune to contamination by oil mist, steam, or particulate matter, since the measurement field penetrates non-conductive media without attenuation.

The 8mm probe diameter is a deliberate mechanical and electromagnetic compromise. Compared to the 5mm 330105 series, the larger coil geometry extends the linear measurement range to 2.0 mm and reduces sensitivity to minor shaft surface irregularities (runout, scratches, plating variations). The 305 mm integral cable minimises the impedance discontinuity at the probe-to-extension junction — a critical factor because any impedance mismatch in the coaxial path introduces a DC offset error that cannot be corrected by driver calibration alone.

The extension cable uses a low-loss, temperature-stable coaxial construction with a characteristic impedance matched to the probe coil. The 5-metre length (code 05) is the most common field configuration, placing the proximitor outside the high-temperature bearing housing zone while keeping total cable capacitance within the driver’s compensation range. Exceeding the specified cable length without a matched driver recalibration will shift the scale factor and introduce non-linearity at the extremes of the measurement range.

EMC performance is achieved through the coaxial shielding of both the integral and extension cables, combined with the differential signal architecture inside the proximitor. The driver’s output stage presents a low source impedance to the monitor input, making the signal path resistant to common-mode noise induced by adjacent power cables or variable-frequency drives — a practical necessity in turbine hall environments where 480 V bus bars and VFD switching transients coexist with millivolt-level vibration signals.

System Integration Benefits

• API 670 channel compliance: The 330104-02-12-05-02-00 meets the full electrical and mechanical requirements of API 670 5th Edition for radial vibration and thrust position channels, eliminating the need for supplementary compliance documentation during machinery acceptance testing.
• Factory scale-factor traceability: Each system is calibrated as a matched set (probe + extension + driver) against NIST-traceable standards. The 7.87 V/mm scale factor is certified at manufacture, removing field calibration from the commissioning critical path.
• Deterministic signal latency: The analogue output has no digital processing delay. From mechanical displacement to monitor input, signal propagation is governed only by cable capacitance and driver bandwidth — typically <1 ms — preserving the time-domain integrity required for keyphasor-referenced phase analysis.
• Direct 3500-rack compatibility: The output is directly compatible with the 3500/42M and 3500/40M Proximitor I/O modules without signal conditioning adapters, reducing rack wiring complexity and eliminating potential ground loop paths introduced by intermediate signal converters.
• Non-contact wear profile: Zero mechanical contact with the rotating shaft means the transducer’s measurement characteristics do not degrade with machine run-hours. Calibration drift over a 5-year service interval is typically <0.5% of full scale under stable thermal conditions.
• Broad target material tolerance: While calibrated for AISI 4140, the 3300 XL driver supports field-selectable target material correction factors for 316 stainless steel, Inconel 718, and titanium alloys — enabling deployment on compressor shafts and turbine rotors without probe replacement.
• Hazardous area deployment: The base 330104-02-12-05-02-00 (suffix 00) is CE-marked for general industrial use. ATEX Zone 1 and IECEx-certified variants share identical mechanical dimensions and electrical interfaces, allowing a single installation design to be adapted for classified areas by suffix substitution only.
• Backward compatibility with legacy 3300 infrastructure: The 3300 XL series maintains electrical compatibility with earlier 3300 series drivers and 3500 rack I/O modules, protecting existing cable infrastructure and monitor rack investments during phased machinery upgrades.

Quality Assurance & Global Logistics

Every 330104-02-12-05-02-00 unit supplied by siemensplc.com is sourced from authorised Bently Nevada (Baker Hughes) distribution channels. Units are inspected upon receipt against the manufacturer’s acceptance criteria: probe coil resistance, extension cable continuity and insulation resistance, connector integrity, and physical condition of the probe tip and cable jacket. Factory calibration documentation is retained and available on request for critical applications requiring full traceability records.

Inventory is held at our Xiamen, China facility, positioned to serve both domestic PRC customers and international buyers across Southeast Asia, the Middle East, and Europe. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for all international shipments. DHL Express, FedEx International Priority, and sea freight consolidation are available depending on order volume and delivery urgency. Typical DHL transit times from Xiamen: 2–3 business days to Singapore and Hong Kong; 3–5 business days to the UAE and Germany; 5–7 business days to the United States.

All units are dispatched in original manufacturer packaging where available, or in equivalent anti-static, moisture-barrier packaging for long-transit shipments. A 12-month warranty against manufacturing defects is provided from the date of dispatch. Warranty claims are processed with replacement unit dispatch within 5 business days of confirmed fault diagnosis.

Contact Information

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