Bently Nevada 330904-00-19-50-02-00 Proximity Transducer – 3300 XL NSv

Bently Nevada 330904-00-19-50-02-00 — Eddy-Current Proximity Transducer for Continuous Shaft Displacement Monitoring

The 330904-00-19-50-02-00 is a field-wired proximity transducer assembly within Bently Nevada’s 3300 XL NSv (Non-Standard Voltage) series, engineered specifically for non-contact measurement of radial shaft displacement and vibration on rotating machinery. Unlike general-purpose inductive sensors, this assembly is calibrated as a matched system: probe tip, extension cable, and proximitor driver are characterized together at the factory to achieve a combined sensitivity of 7.87 V/mm (200 mV/mil) across the linear measurement range. The part number suffix 00-19-50-02-00 encodes the full mechanical and electrical configuration — 19-foot (5.79 m) extension cable, 50 mm probe body diameter, standard output polarity, and no special hazardous-area certification variant — making it directly interchangeable within any 3300 XL NSv rack installation that specifies this cable length and probe geometry.

In a turbomachinery protection architecture, the proximity transducer occupies the first node in the measurement chain. Its output — a DC-biased AC signal riding on a nominal −24 VDC carrier — feeds directly into the 3300 XL NSv Proximitor module, which conditions the signal and presents a buffered output to the 3500 Series monitoring rack. The rack then applies alarm and danger setpoints in real time, typically at 125 µm pp (5 mil pp) for alarm and 250 µm pp (10 mil pp) for danger on most steam turbine applications per API 670 fifth edition. Any degradation in transducer linearity, gap voltage drift, or cable impedance mismatch will propagate directly into false trips or, more dangerously, missed trips. The 330904-00-19-50-02-00 is therefore not a commodity sensor — it is a safety-critical measurement device whose specification must be matched precisely to the installed proximitor and monitoring system.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL NSv system employs a three-component matched architecture: probe tip, extension cable, and proximitor driver. Each component is characterized individually and then verified as an assembly. The probe tip generates a high-frequency oscillating magnetic field (typically in the range of 1–2 MHz) via an internal LC tank circuit. When a conductive target enters the field, eddy currents are induced on the target surface, loading the tank circuit and reducing its oscillation amplitude. The proximitor demodulates this amplitude change and outputs a proportional DC voltage. The NSv designation indicates that the proximitor operates at a non-standard supply voltage architecture compared to the legacy 3300 series, providing improved common-mode noise rejection — a critical advantage in environments with variable-frequency drives (VFDs), large motor starts, and ground loops common in petrochemical and power generation facilities.

The 19-foot extension cable in this assembly uses a precision-impedance coaxial construction. The cable’s distributed capacitance and inductance are tightly controlled to maintain the tank circuit Q-factor within the calibrated range. Substituting a non-OEM cable — even one with nominally identical dimensions — will shift the tank resonance frequency, alter the sensitivity constant, and invalidate the factory calibration. This is why Bently Nevada specifies the complete assembly by a single part number rather than allowing field-mixed components. The 50 mm probe body diameter provides a larger sensing face area compared to the 25 mm variant, extending the linear measurement range and improving signal-to-noise ratio on large-diameter shafts (typically above 100 mm journal diameter) where the shaft curvature would otherwise reduce effective coupling area.

EMC performance is achieved through the differential signal architecture within the proximitor, combined with the shielded coaxial cable construction. The shield is grounded at the proximitor end only (single-point grounding), preventing shield current loops that would introduce 50/60 Hz interference into the measurement signal. This design is consistent with IEC 61000-4 series immunity requirements and allows the system to maintain measurement accuracy in environments with radiated field strengths up to 10 V/m.

System Integration Benefits

• API 670 Compliance: The 330904-00-19-50-02-00 is designed and characterized to meet API 670 fifth edition requirements for proximity transducer systems, enabling direct use in machinery protection systems without additional qualification testing.
• Deterministic Signal Latency: The analog output architecture ensures measurement latency below 1 ms from shaft displacement to proximitor output, meeting the response time requirements of 3500 Series voting logic for fast-acting trip functions.
• Matched-System Calibration Traceability: Factory calibration data is traceable to NIST standards. The matched assembly eliminates field calibration errors introduced by component mixing, reducing commissioning time and measurement uncertainty.
• Broad Rack Compatibility: The −24 VDC NSv output is directly compatible with 3500/40M, 3500/42M, and 3500/45 monitor modules, as well as legacy 3300 XL monitor cards, without signal conditioning adapters.
• Diagnostic Transparency: The DC bias voltage at the proximitor output provides a continuous, passive diagnostic indicator. A gap voltage outside the −10 VDC to −18 VDC window at nominal installation gap immediately flags probe damage, cable open-circuit, or target loss — without requiring active diagnostics software.
• Hazardous Area Deployment: The standard 02-00 configuration supports installation in Zone 2 / Division 2 classified areas when used with appropriate Zener barrier or galvanic isolator per the system’s hazardous area certification documentation.
• Minimal Scheduled Maintenance: Non-contact eddy-current technology eliminates mechanical wear mechanisms. The primary maintenance action is periodic gap voltage verification — a 5-minute procedure — rather than physical replacement on a time-based schedule.
• Interchangeability Within 3300 XL NSv Fleet: Standardizing on the 330904-00-19-50-02-00 across a plant fleet reduces spare parts inventory complexity. A single spare assembly covers all machines with the same cable-length and probe-diameter specification, reducing carrying cost and eliminating configuration errors during emergency replacements.

Quality Assurance & Global Logistics

Every 330904-00-19-50-02-00 unit supplied by siemensplc.com is sourced through verified supply channels with full part number and label authentication. Prior to shipment, each assembly undergoes visual inspection for physical integrity, connector condition, cable jacket continuity, and label accuracy against the Bently Nevada part number matrix. Units are packaged in anti-static, moisture-barrier bags with foam-lined outer cartons rated for international air and sea freight handling. Shipment originates from Xiamen, China, with DHL Express, FedEx International Priority, and UPS Worldwide Express options available. Typical transit time to major industrial hubs in Southeast Asia, the Middle East, and Europe is 3–5 business days on express services. Full commercial invoice, packing list, and certificate of conformance documentation are provided with each shipment to support customs clearance in regulated markets. A 12-month warranty against manufacturing defects is included with every unit.

Contact Information

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