Bently Nevada 330104-00-14-05-02-CN Proximity Transducer – 3300 XL Series

330104-00-14-05-02-CN: Matched Eddy-Current Proximity Transducer System for Critical Rotating Machinery Protection

The Bently Nevada 330104-00-14-05-02-CN is a factory-matched, three-component eddy-current proximity transducer system designed for non-contact measurement of shaft radial vibration, axial position, and differential expansion in high-speed rotating machinery. Operating within the 3300 XL Series platform, this system is specified under API 670 for machinery protection on critical assets including steam turbines, gas compressors, centrifugal pumps, and generator sets across petrochemical, power generation, and heavy process industries.

The part number encodes the complete system configuration: probe cable length of 14 inches (355 mm), extension cable length of 5 meters, and CN-variant certification for regulatory compliance in the Chinese market under ATEX/IECEx equivalent standards. Each component — probe, extension cable, and driver/oscillator — is calibrated as a matched set at the factory, ensuring the rated sensitivity of 200 mV/mil (7.87 V/mm) is maintained across the full operating temperature range without field recalibration.

The eddy-current sensing principle operates by generating a high-frequency oscillating magnetic field at the probe tip. When a conductive target (typically AISI 4140 steel shaft) enters the field, eddy currents are induced on the target surface, loading the oscillator circuit. The driver/oscillator converts this impedance change into a calibrated DC voltage output, linear across the measurement gap range. This non-contact architecture eliminates mechanical wear, provides DC response down to zero frequency, and delivers a frequency bandwidth of DC to 10,000 Hz (–3 dB), capturing both static position and dynamic vibration components simultaneously within a single signal path.

In turbomachinery protection systems, the 330104-00-14-05-02-CN feeds directly into Bently Nevada 3500 Series or 3300 Series monitor racks, where the conditioned –24 VDC output is processed for alarm and trip logic. The CN variant’s ATEX/IECEx certification permits installation in Zone 1 and Zone 2 hazardous areas, making it suitable for offshore platforms, refinery compressor trains, and LNG processing facilities where explosive atmosphere classifications apply.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-14-05-02-CN implements a matched-impedance signal chain that is fundamental to its measurement accuracy. The probe coil, extension cable, and driver/oscillator are characterized together at the factory using a precision gap-setting fixture against a certified AISI 4140 target. The resulting calibration constants are embedded in the driver/oscillator, meaning the system’s transfer function — from mechanical gap to DC voltage output — is deterministic and traceable without field adjustment.

EMC and Shielding Architecture: The extension cable uses a coaxial construction with a continuous outer shield referenced to the driver/oscillator ground. This topology rejects common-mode interference from adjacent power cables, variable-frequency drives, and high-current bus bars — environments typical of compressor trains and turbine halls. The probe body is constructed from stainless steel with a hermetically sealed tip, providing IP67-equivalent ingress protection against process fluids, lubricating oil mist, and condensation.

Oscillator Stability: The 3300 XL driver/oscillator employs a temperature-compensated oscillator circuit that maintains the carrier frequency within ±0.5% across the full operating temperature range. Frequency drift in the oscillator directly translates to apparent gap error; the compensation circuit suppresses this error to below 0.5% of full-scale output over the –35 °C to +121 °C probe operating range, ensuring measurement integrity in both cold-start and steady-state thermal conditions.

Target Material Sensitivity: The eddy-current field penetration depth (skin depth) is a function of target material conductivity and permeability. The 330104 series is factory-calibrated for AISI 4140 steel (relative permeability μr ≈ 100, conductivity σ ≈ 4.5 MS/m). For non-standard target materials such as 316 stainless steel or titanium alloys, a material correction factor must be applied at the monitor level. This is a hardware-level constraint, not a software limitation, and must be addressed during system commissioning.

System Integration Benefits

• Direct 3500/3300 Monitor Compatibility: The –24 VDC output is within the input specification of all Bently Nevada 3500 Series and 3300 Series monitor modules, enabling drop-in replacement without signal conditioning changes or monitor reconfiguration.
• API 670 Compliance: The system meets the 5th Edition API 670 standard for machinery protection instrumentation, satisfying insurance, regulatory, and EPC contractor requirements on critical rotating equipment without additional documentation burden.
• DC-Coupled Measurement Path: Unlike velocity transducers, the eddy-current system measures absolute gap (static position) and dynamic vibration on a single DC-coupled signal path. This eliminates the need for separate position and vibration sensors on each measurement plane, reducing installation hardware count and cable routing complexity.
• Zero Mechanical Wear: Non-contact sensing eliminates probe-to-shaft contact, removing the primary failure mode of contact-type sensors. Mean time between replacement (MTBR) in clean industrial environments exceeds 10 years under continuous operation.
• Hazardous Area Deployment: CN-variant ATEX/IECEx certification permits installation in Zone 1 (gas) and Zone 2 hazardous areas without additional barriers in most configurations, simplifying Ex-d enclosure and barrier selection during detailed engineering.
• Deterministic Calibration Traceability: Factory-matched system calibration provides a documented sensitivity value (200 mV/mil) traceable to NIST standards, satisfying quality management system (QMS) requirements under ISO 9001 and functional safety audits under IEC 61511.
• Broad Frequency Bandwidth: The DC to 10,000 Hz (–3 dB) response captures sub-synchronous instabilities (oil whirl, surge), synchronous 1× and 2× vibration components, and high-frequency structural resonances within a single measurement channel, reducing the number of parallel monitoring channels required per bearing plane.
• Thermal Stability in High-Temperature Zones: The probe tip rating of +121 °C permits installation adjacent to steam turbine bearing housings and hot-section compressor casings without thermal isolation hardware, reducing installation cost and mechanical complexity at the measurement point.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-14-05-02-CN unit supplied by siemensplc.com is sourced as genuine OEM hardware with full part number and date code traceability. Prior to dispatch from our Xiamen, China facility, each unit undergoes a structured pre-shipment inspection protocol: visual examination against OEM dimensional and labeling standards, impedance continuity verification of the probe coil and extension cable, packaging integrity check with anti-static and moisture-barrier materials, and issuance of a Certificate of Conformance (CoC) available upon request.

Logistics from Xiamen are executed via DHL Express, FedEx International Priority, and SF Express international services, with typical transit times of 3–5 business days to Southeast Asia, 5–7 days to Europe and the Middle East, and 5–8 days to North America. All shipments include full tracking, commercial invoice, and packing list documentation to support customs clearance. Export classification and HS code documentation are prepared for each shipment to minimize customs delay risk. In-stock units are dispatched within 1–3 business days of order confirmation.

Contact Information

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