Bently Nevada 330103-00-05-05-02-CN Eddy Current Proximity Probe – 3300 XL Series

Bently Nevada 330103-00-05-05-02-CN — 5mm Eddy Current Proximity Probe in the 3300 XL Measurement Chain

The 330103-00-05-05-02-CN is a 5 mm diameter, non-contact eddy current proximity probe manufactured by Bently Nevada (a Baker Hughes company) as part of the 3300 XL Series machinery protection platform. This specific configuration ships with a 5-metre integral cable and a 2-metre extension cable, yielding a total system cable length of 7 metres — a standard geometry for mid-frame turbomachinery installations where the driver/oscillator-demodulator is mounted at the edge of the bearing housing pedestal.

Within a rotating machinery protection loop, this probe functions as the primary transducer responsible for converting mechanical shaft displacement into a calibrated DC voltage signal. It operates on the eddy current induction principle: an internal oscillator circuit — housed in the driver unit — drives a coil at the probe tip at approximately 1.0 MHz. When a conductive target (typically AISI 4140 steel shaft) enters the electromagnetic field, eddy currents are induced on the target surface, loading the oscillator and reducing the coil’s resonant amplitude. The driver demodulates this amplitude change into a linear DC output with a nominal scale factor of 7.87 V/mm (200 mV/mil), which is then fed directly into a Bently Nevada 3500 Series rack monitor or a DCS analog input card.

This probe is fully compliant with API 670 (5th Edition), the mandatory machinery protection standard for oil & gas, petrochemical, and power generation industries. It is a direct OEM replacement for existing 3300 XL installations and requires no recalibration when substituted within a matched probe-extension-driver set of the same series.

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Technical Parameters

Hardware Logical Analysis

Eddy Current Field Geometry and Tip Diameter Selection

The 5 mm probe tip diameter of the 330103-00-05-05-02-CN defines the electromagnetic field cone geometry. A smaller tip diameter produces a tighter, more focused field with a shallower linear range — appropriate for small-diameter shafts (typically 25 mm to 75 mm journal diameter) where spatial resolution is critical. The 5 mm tip yields a linear range of 0.25 mm to 2.25 mm, which aligns with the bearing clearance windows typical of high-speed compressor and turbine shafts. Engineers selecting between 5 mm and 8 mm probes must account for shaft diameter, target surface finish (Ra ≤ 0.8 µm recommended), and the required gap at the operating point — typically set at the midpoint of the linear range (approximately 1.0 mm for this probe).

EMC Design and Shielded Cable Architecture

The integral cable of the 330103 series uses a coaxial construction with a low-loss dielectric and a continuous braid shield terminated at both ends. This architecture suppresses common-mode noise injection from adjacent power cables, variable-frequency drives, and high-current bus bars — all of which are present in typical turbomachinery enclosures. The TNC connector provides a positive-locking, constant-impedance interface (50 Ω) that maintains signal integrity at the 1.0 MHz carrier frequency across the full cable length. Impedance discontinuities at the connector junction are controlled to less than 1% reflection coefficient, preventing standing-wave distortion of the demodulated output.

Temperature Coefficient and Thermal Drift Compensation

The 3300 XL probe coil is wound with a temperature-stable alloy and encapsulated in a high-temperature epoxy compound rated to +177°C. The scale factor thermal coefficient is specified at less than ±0.5% over the full operating temperature range when used with the matched 330180 series driver. This level of thermal stability is essential in steam turbine applications where bearing housing temperatures can exceed 120°C during steady-state operation, and transient thermal gradients occur during startup and shutdown cycles.

IP67 Sealing and Mechanical Robustness

The probe body and cable junction are sealed to IP67, providing complete protection against dust ingress and temporary immersion to 1 metre depth. In practice, this rating is relevant for steam washdown during maintenance outages and for installations in wet gas compressor environments where condensate accumulation is expected. The probe housing is machined from 316 stainless steel, providing resistance to H₂S-bearing process atmospheres and chloride-containing cooling water environments.

System Integration Benefits

• Direct 3500 Series Rack Compatibility: The 330103-00-05-05-02-CN integrates without signal conditioning adapters into any Bently Nevada 3500/42M, 3500/40M, or 3500/45 monitor card. The −24 VDC supply and 7.87 V/mm scale factor are natively recognized by the rack firmware, eliminating manual scale factor entry and reducing commissioning errors.
• Deterministic Signal Latency: The eddy current measurement chain introduces less than 100 µs of signal latency from shaft displacement to rack input. This deterministic response time is critical for machinery protection systems where trip response must occur within one shaft revolution at rated speed — a requirement that eliminates relay-based signal conditioning from the protection path.
• Dual-Plane Vibration Monitoring: Two 330103 probes mounted at 90° (X-Y configuration) on a single bearing plane provide full rotor orbit reconstruction. The 3500 rack processes both channels simultaneously, enabling Keyphasor-referenced orbit plots, 1X/2X vector separation, and shaft centerline position trending — all from a single probe pair per bearing.
• Axial Position Measurement Capability: When mounted in the thrust bearing plane with the target face perpendicular to the shaft axis, the same probe model measures rotor axial position (thrust position) with the same 7.87 V/mm scale factor. This eliminates the need for a separate probe model for axial versus radial applications in standard turbomachinery configurations.
• SIL-Rated Protection Loop Integration: The 3300 XL probe, when used with a 3500 series Safety Monitor (3500/33), forms part of a SIL 2-capable machinery protection loop per IEC 61511. The probe itself does not carry a SIL rating, but its API 670 compliance and documented failure mode data (available from Baker Hughes) support the probabilistic failure analysis required for SIL verification.
• Diagnostic Transparency via Gap Voltage Monitoring: The raw DC output voltage from the driver provides a continuous, real-time indication of the probe-to-shaft gap. Operators can monitor gap voltage drift over time to detect probe fouling, shaft wear, or mounting bracket creep — all without interrupting the protection function. A gap voltage outside the ±10% band of the nominal installation gap (typically −10 VDC ± 1 V) triggers a Not-OK condition in the 3500 rack, providing automated diagnostic alarming.
• High-Speed Shaft Compatibility: The 10 kHz (−3 dB) frequency response supports fundamental vibration measurement on shafts rotating at up to 600,000 RPM (10,000 Hz × 60), and captures blade-pass frequencies on compressor impellers with up to 60 blades at 10,000 RPM. This bandwidth eliminates the need for specialized high-frequency probes in the majority of industrial turbomachinery applications.
• Non-Intrusive Installation: The probe mounts in a threaded boss on the bearing housing without requiring shaft modification, process shutdown, or bearing disassembly. The 5 mm tip diameter allows installation in compact bearing housings where larger probe formats cannot be accommodated. Probe gap setting is performed with the shaft stationary using a digital voltmeter on the driver output — no specialized calibration equipment is required on-site.

Quality Assurance & Global Logistics

Every 330103-00-05-05-02-CN unit supplied by siemensplc.com is sourced as a genuine Bently Nevada (Baker Hughes) OEM component. Each unit is shipped in original anti-static OEM packaging with the manufacturer’s batch label intact. Lot traceability is maintained from factory calibration records through to final dispatch, and purchase documentation is available upon request for audit and compliance purposes.

Pre-shipment verification includes: TNC connector torque and contact integrity check; coaxial cable continuity and shield resistance measurement; visual inspection of probe tip and cable jacket for transit damage. Units that do not pass inspection are quarantined and not dispatched.

Logistics operations are based in Xiamen, China — a major international port city with direct air freight connections to Europe, North America, Southeast Asia, and the Middle East. Standard dispatch is within 1–3 business days for in-stock units. Expedited shipping via DHL Express, FedEx International Priority, or UPS Worldwide Express is available for urgent plant maintenance requirements. Full export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration (HS 9031.80) — is prepared for every international shipment to facilitate customs clearance without delay.

A 12-month warranty from the date of shipment covers manufacturing defects and calibration integrity. Warranty claims are processed with replacement dispatch within 5 business days upon receipt of the defective unit and supporting documentation.

Contact Information

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