Bently Nevada 330103-00-22-10-02-CN Proximity Transducer – 3300 XL

Bently Nevada 330103-00-22-10-02-CN — Eddy-Current Proximity Transducer for Critical Rotating Machinery Protection

The 330103-00-22-10-02-CN is a 22-foot (6.7 m) integral-cable eddy-current proximity transducer belonging to Bently Nevada’s 3300 XL measurement system. It operates on the principle of electromagnetic induction: a high-frequency oscillating magnetic field generated at the probe tip induces eddy currents in the conductive target surface; the resulting impedance change is converted by the paired Proximitor® driver into a DC voltage proportional to the gap distance. This non-contact, wear-free measurement mechanism delivers sub-micron displacement resolution across a DC-to-10,000 Hz bandwidth, making it the standard reference instrument for shaft radial vibration, axial position, and differential expansion monitoring on turbomachinery governed by API 670.

The suffix structure of this part number encodes the full mechanical and electrical configuration: 330103 identifies the 3300 XL 8 mm probe body; 00 denotes standard calibration for AISI 4140 steel targets; 22 specifies the 22-foot integral cable; 10-32 UNF thread is embedded in the housing design; 02-CN designates the 2-pin MIL-C-5015 connector variant. Each segment of the part number is a functional specification, not a marketing label.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL probe architecture addresses three principal failure modes that degrade measurement fidelity in industrial environments: thermal drift, electromagnetic interference, and cable-induced signal corruption.

Thermal Compensation Circuit: The probe coil is wound with a temperature-stable alloy and encapsulated in a thermally matched ceramic compound. The Proximitor driver’s internal oscillator is trimmed to compensate for the coil’s temperature coefficient of inductance across the full –35 °C to +177 °C range. This design holds sensitivity variation to within ±1% of nominal across the operating envelope — a critical requirement for axial position monitoring where a 1 mil (25.4 µm) measurement error can trigger a spurious trip on a steam turbine thrust bearing.

Integral Cable EMC Architecture: The 22-foot integral cable eliminates the field-splice junction that is the primary noise ingress point in extension-cable assemblies. The cable shield is terminated at the Proximitor end only (single-point grounding), preventing ground-loop currents from modulating the signal. The armored fluoropolymer jacket provides mechanical protection against abrasion and chemical attack while maintaining a controlled characteristic impedance that preserves the oscillator’s Q-factor stability.

Eddy-Current Depth Penetration and Target Geometry: At the 3300 XL’s operating frequency (nominally 1 MHz), the skin depth in AISI 4140 steel is approximately 25 µm. This shallow penetration means the measurement is sensitive only to the surface layer of the target, making it immune to subsurface metallurgical variations. However, it also means that surface finish, hardness gradients from heat treatment, and residual magnetism directly affect the output. The 00 calibration suffix confirms the probe is factory-characterized for standard 4140 targets; alternative target materials require a correction factor or a custom calibration run.

MIL-C-5015 Connector Reliability: The 02-CN connector designation specifies a military-grade circular connector with bayonet coupling. This connector class is rated for 500 mating cycles minimum, provides IP67 sealing when fully engaged, and maintains contact resistance below 5 mΩ over its service life. In vibration-intensive installations, the bayonet lock prevents the connector from backing out under shock loads that would cause intermittent signal loss in standard threaded connectors.

System Integration Benefits

• Direct API 670 Compliance: The 330103-00-22-10-02-CN is listed as a compliant transducer under API 670 (5th Edition), the mandatory machinery protection standard for new installations in refineries, LNG plants, and power generation facilities. Specifying a listed component eliminates the engineering review burden associated with non-listed alternatives.
• Backward Compatibility with 3300 Infrastructure: The 3300 XL probe is electrically compatible with existing 3300 Proximitor drivers and 3500 Series monitoring racks. Plants upgrading from legacy 3300 installations can replace probes without rewiring junction boxes or reconfiguring rack I/O cards, reducing planned outage duration.
• Deterministic Frequency Response: The flat DC-to-10,000 Hz response covers the 1× and 2× running speed components of machines operating up to 600,000 RPM, as well as sub-synchronous instability frequencies (oil whirl at 0.43–0.48×) and blade-pass frequencies on compressors with up to 60 blades at 10,000 RPM. No derating or correction is required within this band.
• Non-Contact Zero-Wear Operation: The eddy-current principle imposes no mechanical load on the shaft and has no moving parts. Mean time between maintenance actions for the probe itself is effectively unlimited under normal operating conditions, reducing lifecycle cost compared to contact-type displacement sensors.
• Hazardous Area Certification Stack: ATEX, IECEx, FM, and CSA certifications are held simultaneously, covering Zone 1/Division 1 installations across EU, international, and North American jurisdictions. A single part number satisfies multi-regional project specifications without substitution.
• Diagnostic Transparency via DC Output: The Proximitor’s DC output voltage provides a continuous, real-time gap measurement readable by any DCS analog input card. A static gap reading outside the 10–90 mil linear range immediately flags probe misalignment or target runout without requiring a dedicated diagnostic tool.
• Shaft Orbit Reconstruction: Two 330103-00-22-10-02-CN probes mounted at 90° on the same bearing journal provide the X-Y displacement data required to reconstruct the shaft orbit — the primary diagnostic signature for rotor dynamic instability, misalignment, and rub events. The matched sensitivity of 200 mV/mil between probes ensures the orbit is geometrically accurate without per-channel scaling correction.
• Integration with Bently Nevada 3500 Rack: When connected to a 3500/42M Proximitor I/O module, the transducer’s output is processed by the rack’s DSP with configurable alert and danger setpoints, OK relay logic, and buffered output for external data acquisition. The rack’s self-test function continuously monitors the Proximitor supply current to detect open-circuit or short-circuit probe faults without interrupting the measurement channel.

Quality Assurance & Global Logistics

Every 330103-00-22-10-02-CN unit dispatched from our Xiamen, China facility is sourced from authorized Bently Nevada distribution channels and verified surplus inventories with documented chain of custody. Pre-shipment inspection covers: visual examination against OEM cosmetic and labeling standards; integral cable continuity and insulation resistance measurement (minimum 100 MΩ at 500 VDC); sensitivity verification using a calibrated gap-setting fixture traceable to NIST standards; and serialization cross-check against manufacturer documentation where available.

Units are packed in anti-static foam-lined cartons with humidity indicator cards and desiccant sachets. For international shipments, we prepare full commercial invoice, packing list, and certificate of origin documentation to support customs clearance in all major import jurisdictions. Express courier (DHL, FedEx, UPS) delivers to most destinations within 3–7 business days from Xiamen. Sea freight consolidation is available for project quantities. Certificates of conformance and third-party inspection reports are available upon request for critical plant applications.

Contact Information

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