Bently Nevada 330904-00-12-10-01-00 Proximity Transducer – 3300 XL NSv

Bently Nevada 330904-00-12-10-01-00 – Eddy-Current Proximity Transducer for Critical Rotating Machinery Protection

The Bently Nevada 330904-00-12-10-01-00 is a field-proven, non-contact eddy-current proximity transducer belonging to the 3300 XL NSv Series. It is purpose-built for continuous shaft vibration and radial position measurement on turbines, compressors, pumps, and other high-speed rotating assets operating in demanding process environments. The transducer operates on the eddy-current induction principle: a high-frequency oscillating magnetic field generated at the probe tip induces circulating currents in the conductive target shaft; changes in gap distance modulate the field impedance, producing a proportional DC voltage output that the paired Proximitor sensor converts into a calibrated displacement signal.

Unlike piezoelectric accelerometers, which measure acceleration and require integration to derive displacement, this transducer delivers a direct, DC-coupled displacement output from 0 Hz (true DC) through 10,000 Hz. This flat frequency response makes it equally suitable for slow-roll runout characterization at startup speeds below 600 RPM and for capturing sub-synchronous instability events at full operating speed. The 7.87 V/mm (200 mV/mil) sensitivity is factory-calibrated against AISI 4140 steel targets; application-specific recalibration factors are available for alternative target materials such as Inconel 718 or titanium alloys.

The probe body is constructed from 316L stainless steel with a PEEK (polyether ether ketone) tip housing, providing chemical resistance to hydrocarbon condensates, H₂S-bearing atmospheres, and steam environments. The integral armored cable—terminated with a standard coaxial connector—is rated for continuous flexure and resists abrasion in confined bearing-housing installations. Every unit shipped from our Xiamen facility carries a 12-month warranty against manufacturing defects and is accompanied by a documented inspection record.

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

Technical Parameters

Hardware Logical Analysis

The 330904-00-12-10-01-00 operates as the passive sensing element within a three-component measurement chain: probe → extension cable → Proximitor sensor. The probe itself contains a precision-wound coil embedded in the PEEK tip, driven by the Proximitor’s internal oscillator at approximately 1.0 MHz. At this carrier frequency, the skin depth in AISI 4140 steel is roughly 8 µm, meaning the eddy-current field interacts only with the outermost surface layer of the shaft—a characteristic that makes the measurement insensitive to shaft material bulk properties but highly sensitive to surface finish and any conductive contamination on the target face.

The 8 mm probe diameter is a deliberate design choice. Smaller probes (5 mm) offer tighter spatial resolution but exhibit greater sensitivity variation with target material changes. The 8 mm format provides a balanced trade-off: sufficient field penetration depth for stable calibration across common shaft alloys while maintaining a compact enough footprint for standard bearing-housing probe ports machined to API 670 dimensional requirements (typically 11.1 mm bore with 3/8-28 UNF thread).

EMC performance is addressed at two levels. First, the integral armored cable provides continuous coaxial shielding from probe tip to Proximitor input, suppressing common-mode interference from adjacent high-voltage motor drives and bus bars. The shield is grounded at the Proximitor end only (single-point grounding), preventing ground-loop currents that would appear as low-frequency noise on the displacement signal. Second, the PEEK tip housing acts as a dielectric barrier, preventing galvanic coupling between the probe coil and the grounded machine casing—a failure mode that can introduce 50/60 Hz power-frequency artifacts into the vibration spectrum.

The –1 VDC to –17 VDC output range is intentionally asymmetric around the –9 VDC midpoint (corresponding to the 1.27 mm nominal gap). This negative-polarity convention, standardized across the 3300 XL NSv family, allows the monitor card to distinguish a probe-to-target short circuit (output clamps near 0 VDC) from a broken cable or open circuit (output drives toward –24 VDC supply rail)—two fault conditions that would be indistinguishable with a positive-polarity or bipolar output architecture.

System Integration Benefits

• Direct API 670 Compliance: The transducer meets all dimensional, electrical, and performance requirements of API 670 (5th Edition), enabling drop-in installation on machinery protection systems without additional engineering deviation documentation.
• Zero Mechanical Wear: Non-contact measurement eliminates tribological degradation at the sensing interface. Mean time between replacement is governed by cable fatigue and environmental exposure, not sensor wear—typical service intervals exceed 10 years in static installations.
• DC-Coupled Displacement Output: The DC-to-10 kHz frequency response captures both quasi-static position drift (thermal growth, bearing wear) and dynamic vibration simultaneously on a single channel, reducing the number of measurement points required per bearing journal.
• Deterministic Signal Latency: The analog output has no digital processing latency. Signal propagation from shaft motion to Proximitor output is governed only by the RC time constant of the demodulation filter, typically <100 µs—critical for machinery protection systems requiring trip response times below 20 ms.
• Backward Compatibility with 3300 Series Monitors: The 330904-00-12-10-01-00 is electrically and mechanically interchangeable with earlier 3300 XL 8 mm probes, allowing fleet-wide standardization without monitor card replacement or recalibration of existing alarm setpoints.
• System 1 Software Integration: When paired with Bently Nevada System 1 condition monitoring software, the transducer’s calibration coefficients are stored in the Proximitor’s onboard EEPROM and automatically read by the software at startup, eliminating manual sensitivity entry and reducing commissioning errors.
• Diagnostic Transparency via Fault Voltage Levels: The output voltage architecture allows the monitor to distinguish four distinct states—normal operation, gap-too-small, gap-too-large, and cable fault—without additional diagnostic wiring, improving fault isolation speed during unplanned shutdowns.
• Multi-Hazardous-Area Certification Pathway: Select configurations of the 3300 XL NSv series carry IECEx and ATEX Zone 1 certifications. The 330904-00-12-10-01-00 mechanical form factor is compatible with certified barrier assemblies, allowing deployment in classified areas with appropriate Zener barrier or galvanic isolator selection.

Quality Assurance & Global Logistics

Every Bently Nevada 330904-00-12-10-01-00 unit dispatched from our Xiamen, China facility passes through a structured pre-shipment verification protocol. Units are sourced through documented supply channels and undergo visual inspection of the probe tip, cable jacket integrity, connector seating, and label traceability against the manufacturer’s part number matrix. Functional output verification is performed where test infrastructure permits, confirming the –9 VDC ± 0.5 VDC nominal output at the 1.27 mm reference gap.

Xiamen’s geographic position as a major South China Sea port provides direct access to international air freight hubs (Xiamen Gaoqi International Airport) and sea freight lanes serving Southeast Asia, the Middle East, Europe, and the Americas. Standard export documentation—commercial invoice, packing list, certificate of origin, and HS code 9026.80 classification—is prepared for every shipment. DHL, FedEx, and UPS express services typically deliver to major industrial hubs in 3–5 business days. For volume orders, LCL sea freight consolidation is available with transit times of 18–35 days depending on destination port.

A 12-month warranty covers manufacturing defects from the date of shipment. Dead-on-arrival units are replaced without charge upon return of the defective item. Certificate of Conformance documentation is available on request for quality management system compliance.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.