Bently Nevada 330904-00-03-50-02-00 Proximity Transducer – 3300 XL NSv

Bently Nevada 330904-00-03-50-02-00 — Eddy-Current Proximity Transducer System for Critical Rotating Machinery

The Bently Nevada 330904-00-03-50-02-00 is a factory-matched, three-component eddy-current proximity transducer system belonging to the 3300 XL NSv (Non-Standard voltage) platform. It is engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in turbomachinery and other rotating equipment operating under API 670 machinery protection requirements. The system integrates directly with Bently Nevada 3300 XL monitoring racks and is fully compatible with System 1 condition monitoring software, enabling deterministic data acquisition without additional signal conditioning hardware.

This part number encodes a complete, calibrated assembly: the 330904 probe body (8 mm tip diameter), a 5.0-metre coaxial extension cable (denoted by the -50- suffix), and a proximitor/oscillator-demodulator module (-02-00 suffix) that converts RF impedance variation into a calibrated NSv DC voltage output. All three components are factory-matched to a single scale factor, eliminating field calibration uncertainty at installation.

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

Technical Parameters

Hardware Logical Analysis

The 330904-00-03-50-02-00 operates on the principle of high-frequency electromagnetic induction. The probe tip generates an oscillating magnetic field at a carrier frequency typically in the range of 500 kHz to 2 MHz. When a conductive target (shaft) enters this field, eddy currents are induced on the target surface, loading the probe’s LC tank circuit and reducing its effective impedance. The proximitor’s oscillator-demodulator circuit continuously monitors this impedance change and converts it to a proportional DC voltage — the NSv output — at a scale factor of 7.87 V/mm.

EMC Design: The coaxial extension cable provides inherent shielding against radiated electromagnetic interference, a critical requirement in turbine halls and compressor stations where high-voltage switchgear, variable-frequency drives, and large motor starters generate broadband EMI. The shield is grounded at the proximitor end only (single-point grounding), preventing ground-loop currents that would introduce 50/60 Hz noise into the measurement signal.

Factory-Matched Calibration: Unlike field-assembled systems where probe, cable, and proximitor are sourced independently, the 330904-00-03-50-02-00 is calibrated as a matched set. The proximitor’s internal gain is trimmed at the factory to compensate for the specific electrical characteristics of the paired cable and probe, ensuring the 7.87 V/mm scale factor is maintained across the full operating temperature range without field adjustment.

NSv Output Architecture: The Non-Standard voltage output is a Bently Nevada-specific signal standard that provides a wider dynamic range than the legacy 200 mV/mil standard voltage output. This allows the 3300 XL monitor input cards to resolve smaller gap changes with greater resolution, improving alarm setpoint granularity for tight-clearance machinery such as magnetic bearing systems and high-speed compressors.

Thermal Stability: The probe body is constructed from stainless steel with a PTFE-insulated coil winding, providing stable electromagnetic properties across the −35 °C to +121 °C operating range. The proximitor housing is rated to +85 °C, suitable for mounting in junction boxes adjacent to bearing housings without requiring remote mounting enclosures in most standard turbine configurations.

System Integration Benefits

• Direct rack compatibility: Plug-and-play installation into Bently Nevada 3300 XL monitor input channels — no adapter cards, no signal conditioning modules, no rack reconfiguration required.
• Deterministic real-time response: The DC-to-10,000 Hz frequency response covers all sub-synchronous, synchronous, and super-synchronous vibration components relevant to API 670 alarm and trip logic, including 1X, 2X, and high-frequency blade-pass events.
• Diagnostic transparency: The NSv DC output is directly readable by a calibrated voltmeter, enabling field technicians to verify gap distance and system health without a dedicated monitor — a significant advantage during commissioning and troubleshooting.
• System 1 software integration: Data feeds natively into Bently Nevada System 1 condition monitoring software for trend analysis, alarm management, and predictive maintenance workflows without custom driver development.
• Third-party SCADA/DCS compatibility: The 3300 XL monitor’s 4–20 mA and Modbus outputs allow vibration and position data to be integrated into Siemens PCS 7, Honeywell Experion, ABB 800xA, and other DCS platforms with standard I/O mapping.
• Redundancy-ready architecture: Two 330904 systems can be installed at 90° offset on the same bearing journal to provide X-Y radial vibration measurement, satisfying API 670 dual-probe redundancy requirements for critical machinery protection.
• Minimal installation footprint: The 8 mm probe tip diameter and compact proximitor housing reduce the mechanical modification required on existing bearing housings, lowering installation cost and outage duration.
• Long-term measurement stability: Non-contact eddy-current sensing eliminates mechanical wear, contact fatigue, and lubrication dependencies, providing a service life measured in decades under normal operating conditions with no scheduled replacement interval.
• Traceable calibration documentation: Each factory-matched system ships with calibration reference data supporting ISO 9001 maintenance records and regulatory audit requirements in power generation and petrochemical facilities.

Quality Assurance & Global Logistics

Every 330904-00-03-50-02-00 unit stocked by siemensplc.com is sourced from verified supply channels and subjected to a structured incoming inspection protocol before dispatch. Inspection steps include visual examination of probe tip and connector integrity, coaxial cable continuity and shield resistance measurement, proximitor output voltage verification against the nominal scale factor, and cross-referencing of serialization and labeling against the Bently Nevada part number matrix.

Units are packaged in anti-static, moisture-barrier bags sealed within rigid outer cartons with foam cushioning, meeting IATA and IMDG packaging standards for international air and sea freight. Commercial invoices, packing lists, and HS code documentation are prepared for each shipment to facilitate customs clearance in major import markets including the EU, USA, Southeast Asia, and the Middle East.

Shipments originate from our warehouse in Xiamen, China, with standard dispatch within 1–3 business days for in-stock units. Express delivery via DHL Express or FedEx International Priority typically achieves door-to-door transit times of 3–7 business days to most global destinations. Economy sea freight and consolidated air cargo options are available for bulk procurement orders. All shipments include tracking numbers and are covered by our 12-month warranty against manufacturing defects and functional failure under normal operating conditions.

Contact Information

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