Bently Nevada 330103-00-14-05-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-14-05-02-00 — Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330103-00-14-05-02-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It performs non-contact, continuous measurement of radial shaft vibration, axial position, and differential expansion on turbines, compressors, pumps, and gearboxes operating under API 670 machinery protection requirements. The probe forms the field-mounted sensing element of a three-component transducer chain — probe, extension cable, and Proximitor sensor — whose matched calibration delivers a traceable scale factor of 7.87 V/mm (200 mV/mil) across the full linear range.

In a control loop context, this probe sits at the outermost boundary of the protection architecture. Its output feeds directly into the Proximitor sensor, which conditions the raw oscillator signal into a DC-coupled voltage proportional to gap distance and an AC-coupled component representing dynamic shaft motion. That conditioned signal then enters the 3500 Series monitor rack, where trip and alarm setpoints are enforced in hardware with response times under 1 ms — independent of any DCS or SCADA layer. The 330103-00-14-05-02-00 is therefore not a peripheral sensor; it is the primary transduction element on which the entire protection decision chain depends.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-14-05-02-00 operates on a Colpitts-type LC oscillator embedded in the probe tip. The oscillator drives a high-frequency electromagnetic field (typically 500 kHz – 2 MHz carrier) into the target surface. When a conductive target enters the field, eddy currents are induced, loading the oscillator and reducing its amplitude. The Proximitor sensor demodulates this amplitude change into the calibrated DC gap voltage and simultaneously extracts the AC vibration component through a high-pass filter stage.

EMC Design: The coaxial cable geometry between probe and Proximitor provides inherent common-mode rejection. The shield is grounded at the Proximitor end only, preventing ground-loop currents from injecting noise into the signal path. In environments with strong variable-frequency drive (VFD) interference, the coaxial construction maintains signal integrity at carrier frequencies well above the VFD switching harmonics (typically 2–20 kHz), since the probe carrier operates at 500 kHz+.

Thermal Stability: The probe body uses a ceramic-filled epoxy compound with a low coefficient of thermal expansion (CTE) matched to the stainless-steel housing. This minimizes thermally induced dimensional changes at the probe tip that would otherwise appear as false gap shifts in high-temperature bearing housings. The –35 °C to +177 °C operating range covers the full thermal envelope of most steam turbine bearing pedestals without auxiliary cooling.

Matched-Set Calibration: The 3300 XL system is calibrated as a matched set — probe, extension cable, and Proximitor — against a standard AISI 4140 target. The scale factor (7.87 V/mm) is verified at the factory for the specific combination. Substituting any single component with a non-matched unit will shift the effective scale factor and introduce measurement error. When replacing only the probe (same part number, same cable, same Proximitor), the matched-set calibration is preserved, and no rack reconfiguration is required.

Oscillator Redundancy Consideration: The 3300 XL probe does not contain internal redundancy; redundancy is implemented at the system level by installing two probes per measurement plane (X–Y configuration), each connected to an independent Proximitor and monitor channel. The 3500 rack’s dual-channel voting logic (1-of-2 or 2-of-2 selectable) then arbitrates trip decisions, preventing spurious shutdowns from a single probe failure while maintaining protection against genuine shaft events.

System Integration Benefits

• Drop-in Replacement Compatibility: The 330103-00-14-05-02-00 is dimensionally and electrically identical to earlier 330103 variants. Replacing a failed probe requires only mechanical removal and reinstallation — no rack parameter changes, no recalibration of the Proximitor, and no software update to the 3500 monitor.
• Sub-millisecond Protection Response: Because the Proximitor outputs an analog voltage directly to the 3500 monitor’s hardware comparator, the trip response time from shaft event to relay actuation is under 1 ms. This is independent of DCS scan rates or SCADA polling cycles, ensuring the protection layer operates deterministically.
• Broadband Frequency Coverage: The DC–10 kHz bandwidth captures the full spectrum of rotating machinery phenomena in a single channel: sub-synchronous instabilities (oil whirl, surge), synchronous 1× and 2× vibration, and high-frequency gear mesh or blade-pass events. No additional accelerometer channel is required for frequencies within this range.
• Non-Contact Zero-Wear Operation: The eddy-current principle imposes no mechanical load on the shaft and has no moving parts. Mean time between replacement is governed by environmental degradation (cable fatigue, connector corrosion) rather than wear, supporting multi-year continuous operation between planned maintenance windows.
• Diagnostic Transparency via Gap Voltage: The DC gap voltage output provides a continuous, real-time indication of probe-to-shaft clearance. Trending this value over time reveals bearing wear (decreasing clearance), shaft bow (oscillating gap at 1×), and probe mounting looseness (erratic gap shifts) — all detectable before a vibration alarm threshold is reached.
• Hazardous Area Certification: ATEX and IECEx certification allows direct installation in Zone 1 and Zone 2 classified areas (gas groups IIA, IIB, IIC depending on suffix) without additional barriers in most configurations, simplifying the installation bill of materials for offshore and petrochemical sites.
• API 670 Compliance Simplifies Procurement: Specifying an API 670-compliant transducer eliminates the need for project-specific performance verification. The standard defines minimum requirements for sensitivity, linearity, frequency response, and temperature range — all of which the 330103-00-14-05-02-00 meets or exceeds, satisfying EPC contractor and end-user specifications without additional testing.
• Scalable to Wireless and Condition Monitoring Platforms: The analog output of the Proximitor is compatible with third-party condition monitoring systems (e.g., Emerson AMS, SKF @ptitude) via standard 4–20 mA or ±10 V interfaces, allowing integration into plant-wide asset health platforms without replacing the transducer hardware.

Quality Assurance & Global Logistics

Genuine Bently Nevada Hardware: Every 330103-00-14-05-02-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full supply-chain traceability. Units carry original OEM labeling, part number markings, and date codes. We do not supply refurbished-as-new, relabeled, or specification-deviated parts. A Certificate of Conformance (CoC) is available on request for regulated-industry procurement.

Pre-Dispatch Inspection: Each unit undergoes a physical inspection covering label integrity, connector condition, cable sheathing continuity, and probe tip condition before packaging. Units that exhibit any cosmetic or dimensional anomaly are quarantined and not dispatched.

12-Month Warranty: All units are covered by a 12-month warranty against manufacturing defects from the date of dispatch. Warranty claims are processed with replacement dispatch within 5 business days upon confirmation of defect.

Logistics from Xiamen, China: Our warehouse is located in Xiamen, Fujian Province — a major international cargo hub with direct DHL Express and FedEx International Priority connections to over 220 countries. Standard export documentation (commercial invoice, packing list, certificate of origin) is prepared for every international shipment. HS Code 9031.80 applies; we assist with customs declaration preparation to minimize clearance delays. Typical transit times: Southeast Asia 2–4 days, Europe 3–5 days, Americas 4–6 days, Middle East 3–5 days. Urgent AOG (Aircraft on Ground equivalent) shipments can be arranged with same-day dispatch for orders confirmed before 14:00 CST.

Export Compliance: All shipments are processed in accordance with Chinese export regulations and destination-country import requirements. End-user declarations are available for controlled-destination shipments.

Contact Information

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