Bently Nevada 330103-00-10-50-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-10-50-02-00 — 8mm Eddy-Current Proximity Probe for Shaft Displacement Monitoring

The Bently Nevada 330103-00-10-50-02-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System — the most widely deployed non-contact shaft measurement platform in turbomachinery protection globally. This specific part number encodes a defined physical configuration: 1.0 m integral cable, M10 × 1 threaded body, standard 8 mm sensing tip, and a coaxial connector interface matched to the 3300 XL extension cable family. Within a complete transducer chain — probe, extension cable, and proximitor — this probe serves as the primary sensing element, converting the electromagnetic coupling between its coil and the target shaft surface into a DC voltage proportional to the air gap distance.

In a turbomachinery protection loop, the probe is mounted radially or axially relative to the shaft journal. As the shaft rotates, any eccentricity, oil-film instability, or mechanical looseness produces a time-varying gap signal. The 330103-00-10-50-02-00 captures this signal continuously, with no physical contact, no wear mechanism, and no latency introduced by mechanical coupling. The output feeds directly into a Bently Nevada 3500 Series monitor card, where alert and danger setpoints are evaluated in real time against API 670 thresholds. The probe’s role is therefore not passive — it is the first transduction point in a protection chain whose downstream decisions include turbine trip, compressor unload, or alarm annunciation.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-10-50-02-00 operates on the principle of electromagnetic induction: the probe’s internal coil, driven by a high-frequency oscillator within the proximitor, generates an alternating magnetic field at the tip face. When a conductive target enters this field, eddy currents are induced on the target surface, loading the coil and reducing its effective impedance. The proximitor’s demodulation circuit converts this impedance change into a DC voltage output — linear across the specified 0–2.0 mm gap range at a scale factor of 7.87 V/mm.

EMC Design: The coaxial cable construction — with the signal conductor surrounded by a continuous shield — provides inherent rejection of common-mode electrical noise. The shield is grounded at the proximitor end only, preventing ground loop currents that would otherwise introduce low-frequency interference into the displacement signal. In environments with high-frequency switching noise (variable frequency drives, SCR controllers), the coaxial geometry maintains signal integrity without requiring additional filtering at the monitor input.

Thermal Stability: The probe body is constructed from 316 stainless steel, which provides corrosion resistance in oil-mist and process-gas environments while maintaining dimensional stability across the −35°C to +120°C operating range. The coil winding uses a thermally stable formulation that limits sensitivity drift to less than ±0.5% across the full temperature band — a critical parameter for axial position probes where a 25 µm drift at operating temperature could mask a genuine thrust bearing wear condition.

Matched System Calibration: The 330103-00-10-50-02-00 is factory-calibrated as part of a matched probe-cable-proximitor set. The part number suffix encodes the cable length (1.0 m integral) and connector configuration, ensuring that the total system electrical length — which directly affects the oscillator frequency and scale factor — matches the proximitor’s internal compensation network. Substituting a non-matched cable length without recalibration introduces a systematic scale factor error that cannot be corrected by monitor gain adjustment alone.

System Integration Benefits

• Zero mechanical wear: Non-contact measurement eliminates the probe-to-shaft friction that degrades contact-type sensors over time. MTBF for eddy-current probes in continuous service exceeds 100,000 hours under normal operating conditions.
• Deterministic signal latency: The eddy-current transduction chain introduces no mechanical lag. Signal propagation from gap change to monitor input is governed by the proximitor’s demodulation bandwidth (typically 10 kHz flat), enabling accurate capture of sub-synchronous vibration components and blade-pass frequencies.
• Direct API 670 compliance: The 3300 XL system meets API 670 Fifth Edition requirements for radial vibration, axial position, and differential expansion measurement without additional signal conditioning. This simplifies SIL assessment for safety-instrumented machinery protection loops.
• Drop-in OEM replacement: The 330103-00-10-50-02-00 is a direct replacement for any existing 3300 XL 8 mm probe with a 1.0 m integral cable. No monitor reconfiguration, no gap recalibration, and no software parameter changes are required — provided the extension cable and proximitor remain unchanged.
• Diagnostic transparency via gap voltage: The DC output voltage at the monitor’s OK relay circuit provides a continuous health indicator. A gap voltage outside the −4 VDC to −20 VDC window triggers an OK relay dropout, alerting operators to probe failure, cable open-circuit, or target loss — before the vibration measurement itself becomes unreliable.
• Multi-variable measurement from a single probe: Depending on mounting orientation, a single 330103-00-10-50-02-00 can simultaneously provide radial vibration (AC component) and average shaft centerline position (DC component) to the monitor. This dual-variable output reduces the total probe count required per bearing journal.
• Compatibility with 3500 Series rack architecture: The probe’s output is directly compatible with Bently Nevada 3500/40M and 3500/42M monitor cards. No signal conversion or impedance matching is required. The monitor’s internal buffered output allows the same signal to be distributed to a DCS historian, a portable data collector, and the protection relay simultaneously.
• Reduced commissioning risk: Factory-matched calibration data is traceable to the probe serial number. During commissioning, the gap voltage can be verified against the calibration certificate to confirm correct installation gap without requiring a separate calibration instrument on-site.

Quality Assurance & Global Logistics

Every Bently Nevada 330103-00-10-50-02-00 unit dispatched from our Xiamen, China facility is a genuine OEM component sourced through verified supply channels. Bently Nevada (Baker Hughes) maintains strict part number traceability through its manufacturing and distribution network. Each probe carries a factory-applied label with part number, serial number, and date code — all cross-referenced against known-genuine product standards before dispatch.

Inspection Protocol: Prior to packaging, each unit undergoes visual inspection of the probe tip face (no chipping or contamination), cable jacket integrity check along the full 1.0 m length, connector pin condition verification, and label legibility confirmation. Units that do not pass inspection are quarantined and not shipped.

Packaging: Probes are shipped in anti-static foam-lined boxes with moisture-barrier inner packaging. The coaxial connector is capped to prevent contamination during transit. For international shipments, outer cartons are reinforced to withstand standard air freight handling loads.

Logistics from Xiamen: Xiamen is a major international port city with direct air freight connections to hubs in Europe (Frankfurt, Amsterdam), the Middle East (Dubai), Southeast Asia (Singapore, Kuala Lumpur), and North America (Los Angeles, Chicago). Standard international express delivery (DHL, FedEx) from Xiamen to most destinations is 3–5 business days. For urgent plant shutdowns or unplanned outages, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST. Sea freight consolidation is available for bulk orders requiring cost-optimized logistics.

Export Documentation: Commercial invoice, packing list, certificate of origin (Form A or CO), and HS code 9031.80 classification support are provided as standard. Certificates of conformance and inspection reports are available upon request for quality-critical procurement processes.

Contact Information

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