Bently Nevada 330104-10-20-10-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330104-10-20-10-02-00 — Eddy-Current Proximity Transducer System for Continuous Rotating Machinery Protection

The 330104-10-20-10-02-00 is a factory-matched, three-component eddy-current proximity transducer system manufactured by Bently Nevada under the 3300 XL Series platform. It is engineered for non-contact, continuous measurement of shaft radial vibration, axial position (thrust), and differential expansion in critical rotating machinery. The system is specified as the primary sensing element in API 670-compliant machinery protection programs across power generation, oil & gas, petrochemical refining, and heavy industrial sectors.

Each digit block in the ordering code encodes a discrete mechanical or electrical parameter — probe thread diameter, active tip length, extension cable length, proximitor cable length, connector type, and target material calibration — ensuring the delivered system is plug-compatible with existing 3300 XL and 3500 Series monitor racks without field recalibration. This deterministic part-number architecture eliminates configuration ambiguity during procurement and reduces commissioning time on-site.

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

Technical Parameters

Hardware Logical Analysis

The 330104-10-20-10-02-00 operates on a three-stage signal chain that converts mechanical displacement into a calibrated DC voltage with no moving parts and no physical contact with the target shaft.

Stage 1 — Probe (Oscillator + Sensing Coil): The 8 mm probe tip houses a wound sensing coil driven by a high-frequency oscillator circuit embedded in the proximitor. The coil generates an electromagnetic field that penetrates the conductive target surface. As the shaft moves within the 0.25–2.26 mm linear range, eddy currents induced in the target surface load the oscillator circuit. This loading is directly proportional to the probe-to-target gap — a smaller gap produces greater eddy-current damping and a measurable reduction in oscillator amplitude.

Stage 2 — Extension Cable (Precision Impedance Transmission): The 2.0 m factory-matched coaxial extension cable transmits the RF signal between probe and proximitor. Cable impedance is matched at the factory to the specific probe coil inductance. Substituting an unmatched cable introduces a systematic scale factor error that cannot be corrected by field adjustment. The armored outer jacket provides mechanical protection against abrasion and chemical exposure in machinery enclosures.

Stage 3 — Proximitor / Oscillator-Demodulator: The proximitor demodulates the amplitude-modulated RF signal and outputs a negative DC voltage linearly proportional to the gap. At the nominal 1.0 mm gap, output is approximately –10 VDC. The output slope of 7.87 V/mm (200 mV/mil) is stable across the full operating temperature range of the proximitor (–35 °C to +85 °C), with thermal drift specified within the ±1% system accuracy budget.

EMC Design: The coaxial cable architecture provides inherent shielding against radiated electromagnetic interference. The proximitor housing is grounded through the cable shield, forming a continuous Faraday enclosure from probe tip to monitor rack input. This design maintains signal integrity in environments with variable-frequency drives, high-current bus bars, and RF-emitting equipment operating in close proximity.

DC-Coupled Output Architecture: Unlike AC-coupled vibration sensors (velocity probes, accelerometers), the eddy-current system’s DC-coupled output preserves static position information. This allows a single channel to simultaneously carry both the DC gap (average shaft position) and the AC vibration component (dynamic displacement), which the monitor rack separates via internal filtering. This dual-function capability reduces channel count in monitor racks and simplifies wiring in retrofit applications.

System Integration Benefits

• Direct Monitor Rack Compatibility: The –2 VDC to –18 VDC output and –24 VDC supply requirement are electrically identical across all Bently Nevada 3300 XL, 3500 Series, and System 1 input cards. No signal conditioning adapters or impedance matching networks are required for rack integration.
• Deterministic Real-Time Response: The DC-coupled analog output has no latency introduced by digital conversion or fieldbus protocol overhead. The monitor rack receives a continuous, real-time displacement signal with a frequency response flat to 10,000 Hz, supporting detection of sub-synchronous instabilities, blade-pass frequencies, and gear mesh events within a single measurement channel.
• Dual-Parameter Measurement on One Channel: The DC component of the output encodes average shaft position (gap); the AC component encodes dynamic vibration amplitude. Monitor racks extract both parameters simultaneously, reducing the total channel count required for a complete radial vibration and position protection scheme.
• Zero Mechanical Wear: Non-contact sensing eliminates probe-to-shaft friction. The system is rated for continuous 24/7 operation across multi-year intervals between planned turnarounds, with no scheduled replacement interval driven by mechanical fatigue.
• Diagnostic Transparency via Gap Voltage: The raw output voltage provides a direct, unambiguous indication of probe-to-shaft gap. Technicians can verify probe installation depth, detect shaft centerline migration, and identify bearing wear trends using a standard DC voltmeter — without specialized diagnostic equipment.
• API 670 Compliance: The system meets the measurement accuracy, frequency response, and temperature range requirements of API Standard 670 (Machinery Protection Systems), enabling direct use in safety-instrumented protection loops without additional qualification testing.
• Wide Target Material Compatibility: Factory calibration targets AISI 4140 steel. Correction factors for Inconel, titanium, stainless steel, and other alloys are documented in Bently Nevada application notes, allowing the same transducer model to serve across diverse rotor material specifications with a single recalibration step.
• Reduced Commissioning Time: Factory-matched probe, cable, and proximitor sets ship with a documented scale factor traceable to the factory calibration standard. Site commissioning is limited to gap verification and output voltage confirmation — typically completed in under 30 minutes per channel by a qualified instrumentation technician.
• Immunity to Environmental Contaminants: Eddy-current sensing is unaffected by oil mist, steam, process gas, and particulate contamination that degrade optical and capacitive sensing technologies. IP67 ingress protection on the probe assembly provides additional defense against liquid ingress during water washing or steam purging operations.
• Long-Term Calibration Stability: The inductive sensing principle is inherently stable over time. Calibration drift is primarily driven by physical damage or connector degradation rather than component aging, supporting extended calibration intervals in accordance with plant maintenance schedules.

Quality Assurance & Global Logistics

Every 330104-10-20-10-02-00 unit dispatched from our Xiamen, China facility is sourced through verified industrial distribution channels with full traceability documentation. Incoming inspection covers visual examination of the probe tip and armored cable jacket, connector pin integrity verification, and output voltage measurement against the published 7.87 V/mm scale factor using a calibrated gap simulator. Serial numbers and date codes are cross-referenced against Bently Nevada manufacturing records where available.

Units are packaged in ESD-safe anti-static bags with desiccant packs and foam-lined cartons rated for international air freight handling. Export documentation — including commercial invoice, packing list, and Certificate of Conformance — is prepared to the destination country’s import requirements. Standard dispatch from Xiamen is within 1–3 business days for in-stock units. Air freight transit to major industrial hubs in Southeast Asia, the Middle East, Europe, and the Americas typically ranges from 3 to 7 business days depending on destination and carrier selection. A 12-month warranty covers manufacturing defects from the date of shipment. Warranty claims are processed with a replacement unit dispatched upon receipt and inspection of the returned item.

Contact Information

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