Bently Nevada 330104-01-06-05-01-05 Proximity Transducer – 3300 XL

Bently Nevada 330104-01-06-05-01-05 — Matched-Set 8mm Eddy Current Transducer for Turbomachinery Shaft Monitoring

The 330104-01-06-05-01-05 is an 8mm eddy current proximity transducer manufactured by Bently Nevada (a Baker Hughes company) as part of the 3300 XL matched-set platform. It operates as the primary sensing element in a three-component chain — transducer, extension cable, and Proximitor® sensor — where all three components are factory-calibrated together to achieve a traceable scale factor of 7.87 V/mm (200 mV/mil) against AISI 4140 steel targets. This matched-set architecture is a mandatory requirement under API 670 5th Edition, the governing standard for machinery protection systems on critical rotating equipment in the oil and gas, power generation, and petrochemical industries.

This configuration specifies a 0.5m stainless steel armored integral cable and a 5m coaxial extension cable. The transducer measures the physical gap between its probe tip and the rotating shaft surface, converting that gap into a DC voltage output ranging from –24 VDC (maximum gap) to 0 VDC (minimum gap), with the AC component of the output carrying dynamic vibration data. The linear measurement range spans 0.25 mm to 2.26 mm (10 to 90 mil), covering the full operational gap window required for radial shaft vibration, axial thrust position, and differential expansion measurements on steam turbines, gas turbines, centrifugal compressors, and boiler feed pumps.

The 3300 XL platform has accumulated decades of field deployment across LNG terminals, combined-cycle power plants, offshore platforms, and refinery compressor trains. Its continued specification by EPC contractors and OEM machinery builders reflects a hardware design philosophy that prioritizes long-term measurement stability and interoperability with both legacy 3300 series racks and current-generation 3500 series monitors.

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

Technical Parameters

Hardware Logical Analysis

The operating principle of the 330104-01-06-05-01-05 is grounded in the eddy current effect: a high-frequency oscillator within the paired Proximitor® sensor — typically running between 500 kHz and 2 MHz — drives an alternating magnetic field through the wound coil at the 8mm probe tip. When the conductive shaft surface enters this field, eddy currents are induced in the target material, extracting energy from the oscillator circuit and reducing its amplitude. The Proximitor® demodulates this amplitude reduction into a DC voltage that is linearly proportional to the air gap between probe tip and shaft. The AC component of the output, superimposed on the DC bias, carries the dynamic vibration signal.

Stainless Steel Armored Integral Cable: The 0.5m armored section addresses two distinct engineering constraints simultaneously. In bearing housing installations, cable routing through confined pedestals exposes instrumentation cables to mechanical abrasion from adjacent piping, structural members, and maintenance traffic. The stainless steel armor provides crush resistance and abrasion protection without adding significant cable stiffness that would stress the probe body at the entry point. From an electrical standpoint, the armor functions as a tertiary shield layer over the coaxial geometry, attenuating capacitive coupling from adjacent power conductors — a relevant concern in turbine pedestals where 480V motor leads and 6.6kV excitation cables may share conduit runs with instrumentation wiring. The controlled coaxial impedance of the integral cable prevents signal reflections that would distort the oscillator waveform over the 5m extension run.

Proximitor®-at-Field-End Topology: A defining architectural decision in the 3300 XL system is the placement of the oscillator/demodulator circuit (Proximitor®) at the field end of the extension cable, mounted close to the machinery, rather than in the instrument rack. This confines the high-frequency oscillator signal to the 0.5m integral cable, while the 5m extension cable carries only the demodulated low-frequency output. The practical consequence is a substantial reduction in the antenna effect of the cable run: a 5m cable carrying a 1 MHz oscillator signal would radiate and receive electromagnetic interference far more aggressively than a 5m cable carrying a DC-to-10kHz output signal. This topology improves EMC immunity in environments with variable-frequency drives, large transformer banks, and high-current bus bars without requiring additional shielding infrastructure.

Thermal Compensation via Matched-Set Calibration: At elevated temperatures, the primary drift mechanism in eddy current probes is dimensional change in the coil former, which shifts the effective coil geometry and alters the scale factor. Bently Nevada addresses this through matched-set calibration: the probe, extension cable, and Proximitor® are calibrated as a system, with the Proximitor® circuit trimmed to compensate for the specific thermal response of the paired transducer. This is why API 670 Annex D explicitly prohibits substituting individual components from different matched sets — doing so invalidates the calibration and introduces scale factor errors that are not detectable through standard loop checks.

IP67 Sealing Architecture: The IP67 rating is achieved through dual O-ring sealing at the cable entry point and a hermetically sealed coil cavity filled with ceramic-loaded epoxy. This construction prevents moisture ingress during high-pressure wash-down operations and in condensing environments such as steam turbine pedestals during cold startups, where differential temperature between the probe body and ambient air drives condensation into unsealed cavities.

System Integration Benefits

• API 670 5th Edition Compliance Without Additional Qualification: The 330104-01-06-05-01-05 satisfies API 670 proximity transducer system requirements as supplied, eliminating the engineering hours and schedule risk associated with third-party qualification testing during EPC project execution.
• DC-to-10kHz Flat Bandwidth in a Single Channel: The frequency response covers slow-roll eccentricity at startup (1–5 Hz), running-speed vibration (10–200 Hz for typical turbomachinery), subsynchronous instabilities, and blade-pass frequencies — all within one measurement channel, removing the need for parallel sensor types at the same measurement point.
• NIST-Traceable Scale Factor Documentation: Factory calibration certificates provide a documented scale factor traceable to national measurement standards, satisfying the SIL verification evidence requirements under IEC 61511 for safety instrumented function documentation.
• Zero Mechanical Loading on the Shaft: Non-contact eddy current sensing imposes no force on the rotating shaft, making it suitable for flexible rotor systems and high-speed machinery where contact-type sensors would introduce measurement artifacts or accelerate bearing wear through added radial loading.
• Direct Compatibility with 3500 Series Monitor Cards: Output signal levels are electrically compatible with Bently Nevada 3500/40M, 3500/42M, and 3500/46M monitor cards, enabling drop-in replacement in existing 3500 racks without rack reconfiguration, software parameter changes, or re-ranging of alarm setpoints.
• Continuous Bearing Clearance Trending via DC Gap: The DC gap voltage provides a real-time bearing clearance measurement that trends bearing wear over time — a leading indicator not available from velocity or acceleration sensors. When integrated with condition monitoring software, this enables maintenance scheduling based on measured mechanical condition rather than fixed calendar intervals.
• Dual-Function Output for Protection and Monitoring: The simultaneous DC (position) and AC (vibration) output from a single transducer channel allows one sensor to feed both the machinery protection system (trip logic) and the condition monitoring system (spectrum analysis) without signal splitting hardware, reducing wiring complexity and potential signal degradation points.
• ATEX / IECEx Intrinsic Safety Compatibility: The 3300 XL system supports intrinsically safe configurations for Zone 1 and Zone 2 classified areas under ATEX and IECEx frameworks, enabling deployment in refinery, LNG, and offshore environments without additional Zener barrier hardware in standard IS configurations.
• Long-Term Spare Parts Availability: As a current-production 3300 XL component, the 330104-01-06-05-01-05 remains available through authorized distribution channels, supporting long-term asset management strategies for facilities with 20–30 year machinery lifecycles where spare parts continuity is a procurement priority.

Quality Assurance & Global Logistics

All units of the 330104-01-06-05-01-05 supplied through siemensplc.com originate from verified distribution channels carrying authenticated Bently Nevada (Baker Hughes) inventory. Pre-shipment inspection protocol covers coil impedance measurement at the probe tip, cable continuity and insulation resistance across the full integral-plus-extension cable assembly, connector seating and locking integrity, and physical marking verification — part number, date code, and serial number — cross-referenced against authenticated reference units. Units are packaged in anti-static, moisture-barrier film with silica gel desiccant, housed in foam-lined transit cases engineered to protect the precision-ground probe tip from mechanical damage during international air and sea freight handling.

Dispatch originates from Xiamen, China, a designated national-level port city with direct access to Xiamen Gaoqi International Airport and Xiamen Port — one of China’s top-ten container ports by annual throughput. This logistics position enables same-day handover to DHL Express, FedEx International Priority, and UPS Worldwide Express, with typical transit times of 2–4 business days to destinations in Europe, North America, Southeast Asia, the Middle East, and Australia. For volume procurement, sea freight consolidation via Xiamen Port provides cost-effective delivery to major industrial port hubs globally.

Export documentation — commercial invoice, packing list, certificate of origin, and customs declaration — is prepared in compliance with Xiamen Customs regulations and applicable international trade requirements. Payment is accepted in USD, EUR, HKD, and CNY via T/T bank transfer and other agreed commercial terms. The 12-month warranty covers manufacturing defects from the date of shipment, with replacement or credit resolution processed within 5 business days of confirmed defect verification.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.