Bently Nevada 400100-100-02 Eddy-Current Proximity Sensor – 3300 XL Series

Bently Nevada 400100-100-02 Air Gap Proximitor Sensor – Eddy-Current Measurement Architecture in Rotating Machinery Protection

The Bently Nevada 400100-100-02 is a field-proven, non-contact eddy-current proximity sensor engineered for continuous shaft vibration, radial position, and rotational speed measurement in turbomachinery and rotating equipment. Operating within the 3300 XL Proximitor® ecosystem, this sensor integrates directly with Bently Nevada 3500 Series machinery protection racks, delivering a calibrated, low-noise analog output that forms the measurement backbone of API 670-compliant monitoring systems.

Unlike general-purpose displacement sensors, the 400100-100-02 is factory-characterized against a defined target material (AISI 4140 steel) and cable system, ensuring that the scale factor—nominally 7.87 V/mm (200 mV/mil)—remains within OEM tolerance across the full operating temperature envelope. This eliminates field recalibration overhead and preserves measurement traceability in regulated plant environments such as LNG terminals, combined-cycle power stations, and offshore compression platforms.

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Technical Parameters

Hardware Logical Analysis

The 400100-100-02 operates on the two-coil eddy-current transduction principle. A high-frequency oscillator (1.0–1.5 MHz carrier) drives the probe tip coil, generating a focused electromagnetic field that penetrates the conductive target surface. As the air gap between probe tip and shaft changes, the eddy-current loading on the coil alters its impedance. The Proximitor® signal conditioning electronics demodulate this impedance shift into a DC-proportional voltage output.

EMC and Noise Rejection Architecture: The coaxial cable geometry between probe and Proximitor provides inherent common-mode noise rejection. The shield is driven at cable guard potential rather than hard-grounded, suppressing capacitive coupling from adjacent power conductors—critical in turbine bearing pedestals where variable-frequency drives generate broadband interference. Internal filtering maintains flat frequency response to 10 kHz while attenuating carrier-frequency artifacts above 100 kHz, ensuring the output presented to the 3500 rack I/O card is free of aliasing artifacts.

Thermal Stability and Scale Factor Drift: The 400100-100-02 is temperature-compensated across its rated –35°C to +85°C envelope. The compensation network within the Proximitor electronics corrects for coil inductance variation with temperature, holding scale factor drift to within ±0.5% over the full range. This is significant in steam turbine applications where bearing housing temperatures vary by 40–60°C between cold-start and full-load steady-state conditions.

Cable System Integrity: The integral armored cable is matched to the probe’s electrical characteristics at the factory. Substituting extension cables of different lengths or impedance characteristics without applying the appropriate correction factor will shift the linear range and scale factor, introducing systematic measurement error. The 400100-100-02 is supplied as a matched, characterized assembly to eliminate this source of field error.

Redundancy Considerations: In API 670-compliant installations, dual-sensor XY radial pairs are standard. The 400100-100-02’s consistent output impedance and scale factor allow direct parallel connection to dual-input monitor cards without impedance mismatch penalties, supporting 1oo2 and 2oo2 voting logic in the 3500/42M Proximitor/Seismic Monitor without additional signal conditioning.

System Integration Benefits

• Direct rack compatibility: Plug-and-play integration with Bently Nevada 3500/42M, 3500/40M, and 3300 Series I/O cards eliminates signal conditioning adapters and associated failure points.
• Deterministic latency: The DC-coupled analog output delivers measurement data with zero protocol latency to the monitor card, supporting alarm response times well within the 1-second API 670 requirement for machinery trip functions.
• Diagnostic transparency: The –24 VDC bias output provides an inherent open-circuit and short-circuit fault signature distinguishable from valid gap readings, enabling the 3500 rack to generate a not-OK status without additional diagnostic hardware.
• Keyphasor compatibility: The sensor’s 0 Hz DC response makes it suitable for once-per-revolution keyphasor duty, enabling phase-referenced vibration analysis (1X, 2X vector tracking) without a separate speed sensor in low-complexity installations.
• Wide frequency coverage: The 0–10,000 Hz bandwidth captures subsynchronous instability (oil whirl, surge precursors) and high-frequency structural resonances within a single measurement channel, reducing channel count in the monitoring rack.
• Non-contact measurement: Zero mechanical contact with the rotating shaft eliminates sensor wear, removes the need for periodic replacement driven by mechanical degradation, and preserves shaft surface finish in precision-ground journal bearing applications.
• Alloy correction factor support: For shafts manufactured from non-standard alloys (Inconel, 17-4 PH stainless), the Proximitor electronics accept external scale factor correction inputs, maintaining measurement accuracy without probe replacement.
• Minimal installation footprint: The M10 probe thread and compact tip geometry allow installation in bearing pedestals with restricted radial clearance, a common constraint in legacy turbine frames where retrofitting modern monitoring is geometrically challenging.

Quality Assurance & Global Logistics

Genuine Bently Nevada Origin: Every 400100-100-02 unit supplied by siemensplc.com is sourced through verified OEM or authorized surplus channels. Units are not remanufactured, relabeled, or reconditioned. Original factory markings, date codes, and serial numbers are preserved intact. OEM certificates of conformance are included where available.

Pre-Shipment Inspection Protocol: Each unit undergoes a structured inspection sequence prior to dispatch: visual examination of probe tip, cable jacket, and connector integrity; dimensional verification of thread pitch and probe diameter; and functional output verification against a reference target at a defined gap. Units failing any inspection criterion are quarantined and not shipped.

Xiamen Export Hub Advantage: siemensplc.com operates from Xiamen, Fujian Province—a designated free-trade zone with direct access to Xiamen Gaoqi International Airport and Xiamen Port, one of China’s top-ten container throughput facilities. This geographic position enables same-day handover to DHL Express, FedEx International Priority, and UPS Worldwide Expedited for most in-stock orders placed before 15:00 CST. Air freight transit times: Frankfurt 3–4 days, Houston 4–5 days, Singapore 2–3 days, Dubai 3–4 days.

Export Documentation: All shipments include a commercial invoice, detailed packing list, certificate of origin (Xiamen Customs), and siemensplc.com inspection report. HS Code classification is provided for customs pre-clearance. Multi-currency payment supported: USD, EUR, HKD, and CNY via T/T bank transfer; PayPal and credit card available for smaller orders.

12-Month Warranty Coverage: siemensplc.com provides a 12-month warranty from the date of shipment covering manufacturing defects and functional failure under normal operating conditions. Warranty claims are processed within 5 business days of receipt of the returned unit. Replacement or full refund options are available at the buyer’s discretion.

Contact Information

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