Bently Nevada 330103-08-12-05-02-00 Proximity Transducer System – 3300 XL Series

Bently Nevada 330103-08-12-05-02-00 — 3300 XL 8 mm Eddy-Current Proximity Transducer System for Rotating Machinery Protection

The 330103-08-12-05-02-00 is a factory-matched, three-component eddy-current proximity transducer system within Bently Nevada’s 3300 XL product family. It is designed for continuous, non-contact measurement of shaft radial vibration, axial position (thrust displacement), and differential expansion in critical rotating machinery. The system consists of an 8 mm probe with a 1.0 m integral armored cable, a 5.0 m extension cable, and a 3300 XL NSv Proximitor® sensor — all calibrated as a matched set at the factory to ensure traceability and measurement accuracy across the full linear range.

In a machinery protection architecture, this transducer system occupies the first link in the signal chain: it converts mechanical shaft displacement into a proportional DC voltage that feeds directly into Bently Nevada 3500 Series monitor racks, 3701 field monitors, or any third-party system accepting a −24 VDC-biased analog output. The scale factor of 7.87 V/mm (200 mV/mil) is the industry-standard calibration for AISI 4140 steel targets, enabling direct interoperability with API 670-compliant monitoring systems without additional signal conditioning.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 330103-08-12-05-02-00 is based on the eddy-current effect: a high-frequency oscillator within the NSv Proximitor® sensor drives an alternating magnetic field through the probe coil. When a conductive target (shaft) enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The Proximitor® demodulates this amplitude change into a DC voltage proportional to the gap between probe tip and shaft surface.

NSv (Non-Standard Voltage) Driver Architecture: The NSv Proximitor® variant is optimized for variable-speed drive (VSD) applications where shaft speed fluctuates across a wide range. Unlike standard Proximitor® sensors, the NSv driver maintains oscillator stability across a broader frequency spectrum, reducing susceptibility to electrical noise injected by VFD switching transients. This is achieved through a tighter-tolerance LC tank circuit and an internal voltage regulator that isolates the oscillator from supply rail perturbations of ±6 V.

EMC Design: The probe cable uses a stainless-steel braid shield with 95% optical coverage, terminated at both ends to the Proximitor® chassis ground. This configuration provides common-mode noise rejection exceeding 60 dB at frequencies up to 100 kHz — sufficient to suppress interference from adjacent motor drives, welding equipment, and high-voltage bus bars typical in turbomachinery enclosures. The extension cable connector employs a bayonet-lock mechanism with a conductive elastomer gasket, maintaining shield continuity and IP67 integrity at the junction point.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low coefficient of thermal expansion (CTE ≈ 5 ppm/°C), minimizing coil geometry change across the −35 °C to +177 °C operating envelope. This limits thermally induced scale-factor drift to less than ±0.5% over the full temperature range — a critical parameter in steam turbine bearing housings where probe-tip temperatures can exceed 150 °C during load transients.

Matched-System Calibration: The probe, extension cable, and Proximitor® are serialized and calibrated as a matched set. The calibration accounts for the combined impedance of the probe coil and extension cable, ensuring the published 7.87 V/mm scale factor is valid for the complete system rather than individual components. Substituting any single component from a different matched set will introduce a scale-factor error that is not correctable through monitor rack gain adjustment alone.

System Integration Benefits

• Direct API 670 compliance: The 7.87 V/mm output and −24 VDC bias are the reference values specified in API 670 Table 1 for radial vibration and axial position channels, eliminating the need for custom scaling in the monitor rack configuration.
• Backward compatibility with 3300 and 7200 probe threads: The 8 mm probe body uses the same M10×1.0 thread as legacy 3300 and 7200 series probes, allowing direct mechanical replacement in existing bearing housing brackets without machining or adapter hardware.
• Auto-recognition in 3500 Series racks: The 3500/42M Proximitor I/O module reads the Proximitor® identification resistor and automatically applies the correct scale factor and gap voltage thresholds, reducing commissioning time and eliminating manual entry errors.
• Deterministic signal latency: The analog DC output has no digital processing delay. Signal propagation from shaft displacement to monitor rack input is governed only by cable capacitance and the Proximitor® demodulator bandwidth (typically 10 kHz flat response), supporting accurate orbit plot reconstruction at shaft speeds up to 120,000 RPM.
• Dual-use for radial vibration and axial position: A single transducer model covers both measurement functions. Axial position channels require only a different mounting orientation (probe axis parallel to shaft centerline) and a corresponding gap voltage setpoint in the monitor — no hardware change.
• Hazardous-area deployment without barriers in IS configurations: ATEX/IECEx-certified variants allow installation in Zone 1 and Zone 2 classified areas. The intrinsically safe circuit parameters (Ui, Ii, Pi, Ci, Li) are documented on the Proximitor® nameplate, simplifying entity concept calculations for associated apparatus selection.
• Diagnostic transparency via gap voltage monitoring: The −24 VDC bias output doubles as a continuous gap voltage indicator. A gap voltage outside the −10 V to −18 V window (for the standard linear range) triggers a not-OK condition in the 3500 rack, providing real-time probe health status without additional instrumentation.
• Interoperability with third-party DCS and SIS platforms: The 4–20 mA retransmission output available on the 3500/42M card allows direct integration with Emerson DeltaV, Honeywell Experion, ABB System 800xA, and Siemens PCS 7 historian and safety logic, supporting unified machinery protection and process control architectures.

Quality Assurance & Global Logistics

Every 330103-08-12-05-02-00 unit dispatched from our Xiamen, China facility is sourced directly from Bently Nevada (Baker Hughes) authorized distribution channels or factory-sealed OEM stock. Incoming inspection covers probe tip geometry, cable jacket integrity, connector pin alignment, oscillator output voltage at nominal gap, and scale-factor verification against the factory calibration certificate. Units that do not meet the published specification are quarantined and not offered for sale.

Serialization records are retained for a minimum of five years, enabling full traceability from shipment back to the original factory batch. For project orders requiring material test reports (MTR) or certificates of conformance (CoC), documentation is prepared at the time of order and included with the shipment.

Logistics from Xiamen cover all major international trade lanes. Standard air freight to Europe, North America, Southeast Asia, and the Middle East typically achieves 3–7 business days door-to-door. Express courier options (DHL, FedEx, UPS) are available for urgent requirements. Export documentation — commercial invoice, packing list, HS code declaration (8543.70 or 9026.80 as applicable), and ATEX/IECEx certificates — is prepared in compliance with destination country import regulations. Customs clearance support is provided for all shipments.

Contact Information

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