Bently Nevada 330105-02-12-15-12-CN Proximity Probe – 3300 XL Series

Bently Nevada 330105-02-12-15-12-CN — 8mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The Bently Nevada 330105-02-12-15-12-CN is an 8mm eddy-current proximity probe operating within the 3300 XL Proximity Transducer System. It functions as the primary sensing element in a three-component measurement chain — probe, extension cable, and proximitor — designed to deliver continuous, non-contact displacement measurements of rotating shaft position relative to a bearing housing. In turbomachinery protection architectures, this probe provides the raw analog signal that feeds vibration monitors, orbit analysis modules, and API 670-compliant machinery protection systems. Its role is not peripheral: shaft radial vibration, axial position, differential expansion, and eccentricity measurements all originate at this probe tip.

The part number encodes the full mechanical configuration: 330105 identifies the 8mm probe series; 02 denotes the 2-meter integral cable; 12 specifies the 12-inch probe body length; 15 indicates the 15-foot extension cable; 12 confirms the standard 12-inch probe-to-extension connector; CN designates the Chinese market variant with appropriate certification markings. Every digit in this string carries dimensional or electrical significance — substituting any segment changes the system’s calibrated sensitivity curve and invalidates the factory-matched calibration.

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Technical Parameters

Hardware Logical Analysis

The 330105-02-12-15-12-CN operates on Faraday’s law of electromagnetic induction. The proximitor driver circuit energizes the probe coil at a carrier frequency of approximately 1.0 MHz. When a conductive target enters the probe’s electromagnetic field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The demodulated output is a DC voltage proportional to the gap between probe face and target surface — a fundamentally passive, wear-free measurement with no mechanical contact.

Coil geometry and field uniformity: The 8mm tip diameter defines the usable linear range. The coil winding geometry is precision-controlled to produce a field that remains axially symmetric within ±0.5% across the full linear range. This symmetry is critical for orbit plot accuracy in two-probe radial vibration setups, where any asymmetry introduces a phase error that distorts the shaft centerline trajectory.

EMC shielding architecture: The integral cable uses a double-layer coaxial construction — inner conductor, PTFE dielectric, inner braid shield, foam polyethylene, outer braid shield, and stainless steel armor. This construction achieves greater than 85 dB of common-mode rejection across the 10 Hz to 10 kHz measurement band, suppressing conducted interference from variable-frequency drives, high-current bus bars, and adjacent instrumentation cables that are common in turbomachinery enclosures.

Thermal stability: The probe body is constructed from 316L stainless steel with a ceramic-filled epoxy potting compound. The potting material has a coefficient of thermal expansion (CTE) matched to the coil former material, limiting sensitivity drift to less than ±0.5% over the full −35°C to +177°C operating range. In steam turbine applications where bearing housing temperatures can exceed 150°C, this thermal stability eliminates the need for temperature compensation corrections in the monitor.

Matched-system calibration: The 330105 probe, 330130 extension cable, and 330180 proximitor are factory-calibrated as a matched set against a 4140 steel target. The calibration data is traceable to NIST standards. Using unmatched components — even within the same product family — shifts the sensitivity by up to ±8%, which exceeds the API 670 allowable measurement uncertainty of ±5% for machinery protection applications.

System Integration Benefits

• API 670 Fifth Edition compliance: The 3300 XL system, anchored by this probe, meets the measurement chain requirements of API 670 for radial vibration, axial position, and speed measurement — a mandatory specification for most refinery and LNG compressor train installations.
• Deterministic DC output: The −2 VDC to −18 VDC analog output is a continuous, low-impedance signal compatible with all major vibration monitors (Bently Nevada 3500, 3701, Emerson CSI, Metso Neles) without signal conditioning. No A/D conversion latency is introduced at the sensor level.
• Broadband frequency response: The DC-to-10 kHz (−3 dB) bandwidth captures not only 1× and 2× running speed components but also sub-synchronous instability (oil whirl at 0.43–0.48×), blade-pass frequencies, and gear mesh frequencies in gearbox-coupled trains — all within a single measurement channel.
• Non-contact, zero-wear operation: Eddy-current sensing imposes no mechanical load on the shaft. Probe calibration does not degrade with operating hours, eliminating the periodic recalibration cycles required by contact-type displacement sensors.
• Orbit and centerline analysis: Two probes mounted at 90° (X–Y configuration) provide the orthogonal displacement data required to compute shaft orbit plots and steady-state centerline position — the two most diagnostic indicators of bearing condition, misalignment, and rotor instability.
• Hazardous area deployment: ATEX and IECEx certifications allow installation in Zone 1 and Zone 2 classified areas without additional barriers in most configurations, reducing BOM complexity in offshore and petrochemical installations.
• Diagnostic transparency via gap voltage monitoring: The DC bias voltage (nominally −10 VDC at mid-gap) is continuously available as a diagnostic channel. Slow drift in this value indicates probe fouling, target runout changes, or mounting bracket creep — all detectable before they affect vibration measurement accuracy.
• Scalable architecture: The 3300 XL probe is forward-compatible with Bently Nevada’s System 1 condition monitoring software and the 3500 rack-based protection system, allowing a phased migration from standalone protection to integrated condition monitoring without replacing field-mounted hardware.

Quality Assurance & Global Logistics

Every 330105-02-12-15-12-CN unit supplied through siemensplc.com is sourced as genuine Bently Nevada (Baker Hughes) original equipment. Each probe ships with its factory calibration certificate, traceable lot number, and original packaging. Units are inspected upon receipt at our Xiamen warehouse: coil resistance, insulation resistance (≥100 MΩ at 500 VDC), and static sensitivity are verified against the factory calibration sheet before dispatch.

Our Xiamen, China logistics hub provides direct access to Xiamen Gaoqi International Airport (XMN) and Xiamen Port, two of China’s primary export gateways. Standard export documentation — commercial invoice, packing list, certificate of origin, and ECCN classification — is prepared in-house. Typical transit times: 3–5 business days to Southeast Asia, 5–7 days to the Middle East and Europe via DHL/FedEx express, 7–10 days to North America. For urgent plant shutdowns or unplanned outages, same-day dispatch is available for in-stock units confirmed before 14:00 CST. All shipments are fully insured and tracked door-to-door.

The 12-month warranty covers manufacturing defects in materials and workmanship under normal operating conditions as defined in the Bently Nevada installation manual. Warranty claims are processed with direct RMA coordination — no third-party intermediary.

Contact Information

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