Bently Nevada 330904-00-17-10-01-00 Proximity Transducer – 3300 XL NSv

Bently Nevada 330904-00-17-10-01-00 — Non-Contacting Eddy-Current Proximity Transducer for Radial Shaft Vibration and Axial Position Measurement

The Bently Nevada 330904-00-17-10-01-00 is a factory-matched, three-component eddy-current proximity transducer assembly belonging to the 3300 XL NSv (Non-Standard Voltage) series. The assembly consists of a probe head, a 5.0 m extension cable, and a proximitor driver module — all characterized as a unit at the factory to eliminate inter-component sensitivity variation. The system is designed for continuous, non-contacting measurement of radial shaft vibration displacement and axial thrust position in rotating machinery subject to API 670 fifth-edition protection requirements, including steam turbines, gas compressors, centrifugal pumps, and gearboxes.

The NSv designation distinguishes this assembly from the standard-voltage 330903 series. The proximitor driver in the 330904 is configured to operate from a non-standard DC supply rail — nominally −18 VDC rather than the conventional −24 VDC — while maintaining identical output sensitivity (7.87 V/mm / 200 mV/mil) and linearity across the full calibrated measurement range of 0.25 to 2.25 mm (10 to 90 mil). This supply voltage flexibility makes the 330904-00-17-10-01-00 the preferred selection for retrofit installations where the existing monitor cabinet power distribution is not configured for −24 VDC, and for mixed-generation control architectures where legacy monitor cards impose a different bias voltage requirement on the transducer loop.

The probe body is machined from 316L stainless steel with a PEEK (polyether ether ketone) tip insert. The PEEK material provides dimensional stability across the probe’s rated operating temperature range of −35 °C to +177 °C at the tip, while its low dielectric constant prevents parasitic capacitive coupling that would otherwise introduce nonlinearity at the extremes of the measurement range. The extension cable uses a dual-shielded, low-capacitance coaxial construction with a measured capacitance of ≤ 82 pF/m, ensuring that the 5.0 m cable run introduces negligible signal attenuation between the probe coil and the proximitor oscillator input. The cable jacket is rated for continuous exposure to hydrocarbon fluids, lubricating oils, and steam condensate, consistent with the environmental conditions found in turbomachinery bearing housings.

Each 330904-00-17-10-01-00 assembly is serialized at the component level. The probe, extension cable, and driver carry individual serial numbers that are cross-referenced on the factory calibration certificate shipped with the unit. This serialization chain preserves measurement traceability across maintenance intervals and supports the data integrity requirements of long-term condition monitoring programs where historical vibration baseline comparisons span multiple years of operation.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 330904-00-17-10-01-00 is based on the perturbation of a high-frequency electromagnetic field by eddy currents induced in a conductive target surface. The proximitor oscillator drives the probe coil at approximately 1 MHz, generating an alternating magnetic field that penetrates the air gap between the probe tip and the rotating shaft. When the target surface enters this field, eddy currents are induced whose magnitude is governed by the inverse-square relationship between field intensity and gap distance. The resulting change in coil impedance loads the oscillator, and the proximitor demodulator converts this impedance variation into a DC voltage output that is linear with gap displacement across the calibrated range.

The NSv supply architecture introduces a secondary voltage regulation stage within the proximitor housing. This stage accepts the non-standard −18 VDC input and generates a regulated internal rail that feeds the oscillator and demodulator circuits at the same operating point as the standard-voltage variant. The regulation topology uses a low-dropout linear regulator with a transient response time of < 50 µs, ensuring that supply voltage perturbations — such as those caused by relay switching or motor starting events on the same DC bus — do not propagate into the measurement signal chain. Supply rejection at the oscillator input exceeds 60 dB across the 10 Hz to 100 kHz band.

EMC integrity is maintained through three independent shielding mechanisms. The extension cable employs a 95% coverage braided outer shield bonded to the proximitor chassis ground at the driver end only, preventing ground loop formation while providing effective attenuation of radiated interference from variable-frequency drives and power converters operating in adjacent cable trays. Ferrite bead filters at the driver input terminals suppress conducted high-frequency noise on the supply line. The probe coil assembly uses a Faraday shield between the coil winding and the probe body to reduce capacitive coupling of electrostatic interference from the target surface, which is particularly relevant in applications where the shaft carries residual static charge from process fluid contact. The combined effect of these measures yields a common-mode rejection ratio (CMRR) that maintains measurement resolution below 2.5 µm in environments with conducted noise levels consistent with IEC 61000-4-6 Level 3.

System Integration Benefits

• Factory-matched assembly eliminates field calibration — The probe, cable, and driver are characterized as a set against a reference gap fixture at the factory. Sensitivity is verified to within ±1% of 7.87 V/mm before shipment, removing the need for gap voltage calibration at commissioning and reducing installation time on critical machinery.
• Flat DC-to-10 kHz frequency response preserves vibration vector fidelity — The bandwidth supports accurate capture of sub-synchronous instability components (e.g., oil whirl at 0.43–0.48× running speed), synchronous 1X unbalance vectors, and super-synchronous blade-pass frequencies without phase distortion, enabling reliable orbit plot generation in the connected monitor.
• NSv supply compatibility resolves retrofit voltage conflicts — In installations where the existing DC distribution provides −18 VDC or where legacy monitor cards impose a non-standard bias, the 330904 replaces the standard 330903 without requiring power supply modifications, reducing retrofit scope and associated downtime.
• API 670 fifth-edition compliance for Group 1 and Group 2 machinery — The assembly meets the radial vibration transducer requirements for turbines, compressors, and pumps without supplementary hardware, satisfying insurance underwriter and plant safety authority requirements for continuous machinery protection systems.
• Gap voltage as a continuous structural health indicator — The static DC output voltage at the nominal operating gap provides a real-time observable for probe fouling, target surface runout changes, and mounting bracket thermal creep. Trending this value in the historian allows maintenance teams to detect mechanical drift before vibration alarm thresholds are reached.
• ATEX Zone 1/2 Group IIC certification for hydrogen-service environments — The intrinsically safe driver configuration permits installation in the most demanding hazardous area classifications without requiring additional zener barriers in most loop configurations, simplifying the safety instrumented system (SIS) design and reducing panel wiring complexity.
• Documented target material correction factors extend deployment flexibility — Bently Nevada publishes sensitivity correction factors for 17-4 PH stainless steel, Inconel 718, and titanium alloys. These factors allow the 330904-00-17-10-01-00 to be used on non-standard rotor materials without replacing the transducer, preserving capital investment in existing probe installations.
• Serialized traceability supports long-term condition monitoring data integrity — Component-level serial numbers cross-referenced on the factory calibration certificate ensure that vibration trend data collected over multi-year monitoring programs remains valid across transducer replacement events, supporting meaningful baseline comparison and remaining useful life estimation.
• Zero mechanical loading on the shaft preserves rotor dynamic behavior — The non-contacting measurement principle introduces no friction, wear, or mass loading on the rotating element. This is particularly significant in high-speed applications above 10,000 RPM where contact-type sensors would alter the rotor’s natural frequency response and introduce measurement artifacts into the vibration spectrum.

Quality Assurance & Global Logistics

Each Bently Nevada 330904-00-17-10-01-00 unit dispatched from our Xiamen, China facility passes a structured pre-shipment verification protocol before packaging. The inspection sequence covers probe tip dimensional integrity, connector thread condition and torque verification, cable jacket continuity and insulation resistance, and driver output voltage measurement at the nominal gap position. Sensitivity is confirmed within ±1% of the 7.87 V/mm specification using a calibrated reference gap fixture. Units sourced through authorized distribution channels are shipped in original OEM packaging with factory calibration documentation. Surplus-channel units are repackaged in anti-static, moisture-barrier pouches with silica gel desiccant inserts and a tamper-evident seal, with inspection results documented on an enclosed test record sheet.

International shipment from Xiamen is executed via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. Typical transit times are 3–5 business days to major industrial centers in Southeast Asia, the Middle East, and Europe; 5–7 business days to North American destinations. Multi-unit orders with flexible lead times are eligible for sea freight consolidation. All export documentation — commercial invoice, packing list, certificate of origin, and HS code classification (8543.70.9000 or 9031.80.9090 as applicable) — is prepared in compliance with Chinese customs regulations and destination-country import requirements. The 12-month warranty covers manufacturing defects and calibration drift beyond published tolerances under normal operating conditions, with advance replacement available for critical plant applications subject to prior arrangement.

Contact Information

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