Bently Nevada 330104-00-03-10-02-CN Proximity Transducer System – 3300 XL Series

Bently Nevada 330104-00-03-10-02-CN: Eddy-Current Proximity Transducer for Shaft Vibration and Position Monitoring

The Bently Nevada 330104-00-03-10-02-CN is a complete eddy-current proximity transducer assembly within the 3300 XL series, designed for continuous, non-contact measurement of radial shaft vibration, axial position, and differential expansion in critical rotating machinery. The system consists of a 10 mm diameter probe, a 3-metre extension cable, and a Proximitor® sensor — all factory-matched and calibrated as a unified measurement chain. This matched-system architecture is fundamental: each component is characterized together to achieve the published sensitivity of 7.87 V/mm (200 mV/mil), eliminating the inter-component gain errors that arise when mixing unmatched probe-cable-proximitor combinations.

In a typical turbomachinery protection loop, the 330104-00-03-10-02-CN occupies the first stage of the signal chain. The probe tip generates a high-frequency oscillating electromagnetic field (nominally 1 MHz carrier). When a conductive target — the shaft — enters the field, eddy currents are induced on the shaft surface, loading the oscillator circuit and producing a proportional change in the Proximitor output voltage. This DC-coupled output spans from approximately −2 VDC (near gap) to −18 VDC (far gap), with the linear measurement range typically between −10 VDC and −18 VDC, corresponding to a physical gap range of 0.25 mm to 2.54 mm (10 mil to 100 mil). The DC component of the output encodes static position (gap), while the AC component encodes dynamic vibration amplitude and frequency — both extracted simultaneously by the downstream monitor without additional signal conditioning hardware.

The suffix structure of the part number encodes the physical configuration: 330104 identifies the 3300 XL 8 mm probe family; 00-03 specifies a 3-metre extension cable; 10 specifies a 10 mm probe tip; 02 identifies the Proximitor housing style; CN denotes the connector type. Procurement engineers should verify each suffix segment against the Bently Nevada 3300 XL ordering guide to confirm dimensional and electrical compatibility with the target installation.

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Technical Parameters

Hardware Logical Analysis

Matched-System Calibration Architecture: The 3300 XL series departs from the field-interchangeable philosophy of earlier Bently Nevada product lines. The probe, extension cable, and Proximitor are characterized as a matched set at the factory, with the Proximitor’s internal oscillator and demodulator tuned to the specific impedance characteristics of the paired probe and cable. This eliminates the ±3% scale factor uncertainty that accumulates when components from different calibration batches are combined. For API 670-compliant installations, this matched-system approach satisfies the standard’s requirement for a documented, traceable calibration chain from probe tip to monitor input terminal.

EMC and Electrical Isolation Design: The Proximitor housing incorporates a fully shielded enclosure with the signal ground isolated from the supply return. The coaxial extension cable maintains a continuous shield from probe body to Proximitor input, with the shield terminated at the Proximitor end only — a single-point grounding topology that prevents shield current loops from injecting noise into the measurement signal. In high-EMI environments such as motor control rooms or near variable-frequency drives, this topology typically achieves common-mode rejection exceeding 60 dB at frequencies up to 10 kHz.

Oscillator Frequency and Target Material Interaction: The 3300 XL probe operates at a carrier frequency of approximately 1 MHz. At this frequency, the eddy-current penetration depth (skin depth) in AISI 4140 steel is approximately 0.08 mm — well below the surface finish depth of a machined journal. This means the measurement is insensitive to subsurface material variations and responds only to the geometric surface of the shaft. However, for shafts manufactured from austenitic stainless steel (e.g., 316L), the lower electrical conductivity and relative permeability of 1.0 result in a scale factor shift of approximately −8% relative to the 4140 baseline. Bently Nevada provides material correction factors in the 3300 XL application manual; these must be applied in the monitor configuration when non-standard shaft materials are used.

Thermal Stability of the Measurement Chain: The Proximitor’s internal voltage reference and demodulator are temperature-compensated over the rated operating range. The published thermal sensitivity coefficient for the 3300 XL system is ≤ 0.05% of full-scale per °C, which translates to a maximum thermal drift of ±1.27 mV/°C at the output. For a typical turbine bearing housing where ambient temperature may vary ±30°C over a startup-to-full-load cycle, the resulting position measurement error is ≤ ±38 mV — equivalent to ≤ ±4.8 μm (0.19 mil) of apparent shaft movement. This level of thermal stability is sufficient for API 670 alarm and trip setpoint accuracy requirements.

System Integration Benefits

• Direct compatibility with Bently Nevada 3500 Series monitors: The −18 VDC output and 7.87 V/mm scale factor are natively recognized by 3500/40M, 3500/42M, and 3500/45 monitor cards without requiring external signal conditioning or scale factor re-entry, reducing commissioning time and configuration error risk.
• API 670 Fifth Edition compliance: The matched-system calibration, documented scale factor traceability, and ATEX/CSA certifications satisfy the instrumentation requirements of API 670 for machinery protection systems in oil and gas applications, supporting regulatory acceptance without additional field calibration.
• Simultaneous static and dynamic measurement: The DC-coupled output delivers both gap (position) and vibration (AC component) on a single coaxial cable pair, eliminating the need for separate position and vibration transducers on the same bearing journal and reducing penetration count in pressurized casings.
• Non-contact measurement eliminates wear: With no physical contact between probe and shaft, there is no mechanical wear mechanism. Mean time between replacement is determined by environmental degradation of the probe tip coating and cable jacket, not by contact fatigue — typically exceeding 10 years in clean, dry installations.
• Plug-compatible replacement for existing 3300 XL installations: The 330104 probe family maintains dimensional and electrical backward compatibility with earlier 3300 XL installations, allowing direct replacement without re-drilling probe ports or reconfiguring monitor scale factors, provided the full matched set (probe + cable + Proximitor) is replaced together.
• Hazardous area deployment: ATEX and CSA certifications permit installation in Zone 1/Zone 2 (ATEX) and Class I Division 1/2 (CSA) classified areas, covering the majority of rotating equipment installations in upstream oil and gas, LNG, and petrochemical facilities without requiring additional intrinsic safety barriers in the standard configuration.
• High-frequency response for blade-pass and gear-mesh analysis: The 10 kHz (−3 dB) frequency response supports not only 1× and 2× running speed vibration measurement but also higher-order phenomena such as blade-pass frequency on compressor impellers (typically 500–3,000 Hz for 10–60 blade machines at 3,000–6,000 RPM) and gear-mesh frequencies on integral gearboxes.
• Diagnostic transparency via gap voltage monitoring: The static gap voltage, continuously available at the Proximitor output, provides a real-time indicator of probe installation integrity. A gap voltage outside the −10 VDC to −18 VDC linear range indicates either a probe-to-shaft gap error, a broken cable, or a failed Proximitor — all distinguishable by the specific out-of-range voltage level, enabling maintenance personnel to isolate the fault without removing the probe from the machine.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-03-10-02-CN unit supplied by siemensplc.com is sourced through verified industrial distribution channels. Incoming units undergo visual inspection of probe tip condition, cable jacket integrity, connector pin alignment, and label authenticity against Bently Nevada factory documentation. Serial number traceability is maintained for each shipment.

All units are covered by a 12-month warranty from the date of shipment. Warranty coverage addresses manufacturing defects and factory calibration non-conformance. Units are dispatched from our warehouse in Xiamen, China, with the following logistics options:

• Express courier (DHL / FedEx / UPS): 3–7 business days to most destinations in North America, Europe, Southeast Asia, and the Middle East.
• Air freight: Available for bulk orders exceeding 50 kg; transit time 5–10 business days door-to-door.
• Sea freight (LCL/FCL): Available for large-volume procurement; transit time varies by destination port.
• Full export documentation provided: commercial invoice, packing list, certificate of origin, and MSDS where applicable.
• Anti-static, moisture-resistant packaging with foam-lined outer carton to protect probe tip and cable connectors during transit.

In-stock units ship within 1–3 business days of order confirmation. For urgent plant shutdown requirements, same-day dispatch is available upon request before 14:00 CST.

Contact Information

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