Bently Nevada 330104-12-20-05-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330104-12-20-05-02-00: 8mm Eddy Current Proximity Transducer in the 3300 XL Platform

The 330104-12-20-05-02-00 is a fully configured, field-deployable 8mm eddy current proximity transducer assembly within Bently Nevada’s 3300 XL Series — a platform purpose-built for continuous, non-contact displacement and vibration measurement on rotating and reciprocating machinery operating under API 670 machinery protection requirements. The part number encodes a complete, calibrated three-component system: the 330104 probe body, a 5.0 m extension cable, and an integrated proximitor driver module. Each element is factory-matched to maintain the system’s 200 mV/mil (7.87 V/mm) scale factor without field recalibration.

In a typical critical machinery protection loop — steam turbine, centrifugal compressor, or high-speed pump — this transducer provides the primary radial vibration and shaft position signal fed to a Bently Nevada 3500 Series monitor rack. The output is a DC voltage proportional to the physical gap between the probe tip and the conductive target shaft, with a linear range of approximately –2 VDC to –18 VDC. At the nominal 1.0 mm (40 mil) gap on an AISI 4140 steel target, the output sits at –10 VDC. This deterministic, analog signal characteristic is what makes the 3300 XL platform the reference standard for turbomachinery protection in petrochemical, power generation, and LNG facilities worldwide.

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Technical Parameters

Hardware Logical Analysis

The 330104-12-20-05-02-00 operates on the principle of electromagnetic impedance modulation. The probe coil, driven by the proximitor’s internal oscillator at approximately 1.0 MHz, generates a focused electromagnetic field at the probe tip. When a conductive target enters this field, eddy currents are induced on the target surface. These eddy currents create a counter-magnetic field that loads the probe coil, reducing its effective inductance and increasing resistive losses — a measurable change in the tank circuit’s impedance. The proximitor demodulates this impedance shift into a proportional DC voltage output.

EMC Design Architecture: The 3300 XL proximitor housing employs a fully shielded, grounded enclosure with internal RF filtering on the supply and output lines. The coaxial extension cable maintains a controlled characteristic impedance between probe and proximitor, preventing signal reflection and standing-wave distortion at high-frequency vibration components. The cable shield is grounded at the proximitor end only — a single-point grounding topology that eliminates ground-loop interference in multi-channel rack installations.

Thermal Stability: The probe body uses a ceramic-filled epoxy potting compound with a low coefficient of thermal expansion (CTE), matched to the stainless steel housing. This minimizes thermally induced dimensional changes at the probe tip that would otherwise appear as false DC gap shifts in high-temperature bearing pedestal environments. The proximitor’s internal temperature compensation circuit corrects for oscillator frequency drift across the –35°C to +85°C operating range, maintaining scale factor accuracy to within ±1% over the full thermal envelope.

Calibrated System Integrity: The 330104 probe, extension cable, and proximitor are factory-matched as a calibrated set. The extension cable’s distributed capacitance and inductance are characterized at the factory and compensated within the proximitor’s oscillator tuning. Substituting a cable of different length or construction — even within the same product family — shifts the effective scale factor and requires full system recalibration against a certified gap standard. This design constraint is intentional: it ensures that every installed system delivers a traceable, repeatable output without field adjustment.

Redundancy Compatibility: In dual-voting or 2-of-3 protection architectures, multiple 330104-12-20-05-02-00 systems can be installed at the same bearing journal at 90° or 45° angular offsets. Each channel feeds an independent monitor card in the 3500 rack. The 3500 Series voting logic then arbitrates between channels, suppressing single-channel faults from triggering spurious shutdowns while maintaining protection against genuine shaft excursions.

System Integration Benefits

• Direct 3500 Rack Compatibility: The 200 mV/mil output is the native input standard for Bently Nevada 3500/40M, 3500/42M, and 3500/45 monitor modules. No signal conditioning, scaling, or intermediate transmitter is required — the transducer output connects directly to the monitor card terminal block.
• Zero-Wear Non-Contact Sensing: With no physical contact between probe and shaft, there is no mechanical wear mechanism. Mean time between maintenance (MTBM) for the sensing element is effectively unlimited under normal operating conditions, reducing planned maintenance intervals and associated downtime costs.
• DC to 10 kHz Bandwidth: The flat frequency response from DC captures both quasi-static shaft position (thrust position, differential expansion) and dynamic vibration components up to the 10th harmonic of a 60,000 RPM machine — a single transducer covers both protection and condition monitoring functions.
• Modular Replacement Architecture: Probe, extension cable, and proximitor are individually replaceable field units. A failed proximitor can be swapped without disturbing the probe installation in the bearing housing — critical for minimizing intrusive maintenance on sealed or hot-section machinery.
• Hazardous Area Certification: FM, CSA, and ATEX approvals allow direct installation in Class I Division 1 / Zone 1 classified areas without additional Zener barriers or galvanic isolators in most standard configurations, simplifying the installation bill of materials.
• API 670 Compliance: The 3300 XL platform is explicitly referenced in API Standard 670 (5th Edition) as a compliant transducer system for radial vibration, axial position, and speed measurement on critical and essential machinery. Specifying this part number satisfies the transducer requirements of API 670 Section 5 without additional engineering justification.
• Deterministic Analog Output: Unlike digital fieldbus sensors, the –2 to –18 VDC analog output has zero latency and no protocol overhead. The monitor card samples this signal at its own A/D conversion rate — typically 65,536 samples/second per channel in the 3500 Series — ensuring that transient vibration events are captured without aliasing or communication-induced delay.
• Multi-Channel Orbit Plot Capability: When two 330104-12-20-05-02-00 transducers are installed at 90° at the same bearing, the 3500 rack’s orbit display function reconstructs the shaft centerline path in real time. This two-channel vector data is the primary diagnostic tool for identifying rotor instability, misalignment, and rub conditions — capabilities not available from single-axis sensors.

Quality Assurance & Global Logistics

Every 330104-12-20-05-02-00 unit dispatched from our Xiamen, China facility is sourced through verified industrial automation supply channels with full part number and lot traceability. Pre-shipment inspection includes output voltage linearity verification across the full gap range, insulation resistance check on the extension cable, and connector pin integrity confirmation. Original Bently Nevada (Baker Hughes) labeling, part number markings, and date codes are preserved without alteration.

Packaging follows anti-static and moisture protection protocols: each assembly is individually bagged in a moisture barrier pouch with desiccant, seated in a custom-cut anti-static foam insert, and shipped in a labeled outer carton. A Certificate of Conformance (CoC) is included as standard documentation. For orders of five or more units, third-party inspection reports are available upon request prior to shipment.

Logistics from Xiamen are executed via DHL Express, FedEx International Priority, or UPS Worldwide Expedited — typical transit times of 3–5 business days to major industrial hubs in Europe, the Middle East, Southeast Asia, and the Americas. For bulk orders, sea freight consolidation with full export documentation (commercial invoice, packing list, certificate of origin) is available. DAP and DDP Incoterms are both supported. In-stock units are confirmed and allocated at time of order acknowledgment.

Contact Information

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