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

Bently Nevada 330103-00-10-10-02-CN: 8mm Eddy Current Proximity Probe for Continuous Shaft Monitoring in the 3300 XL Platform

The 330103-00-10-10-02-CN is an 8mm eddy current proximity probe manufactured by Bently Nevada (Baker Hughes) and designed as the primary sensing element within the 3300 XL proximity measurement system. It operates on the principle of electromagnetic induction: a high-frequency oscillating current driven through the probe coil generates an alternating magnetic field at the probe tip. When a conductive target — typically a ferromagnetic shaft machined to AISI 4140 or equivalent — enters this field, eddy currents are induced on the target surface. The resulting change in coil impedance is proportional to the air gap between probe tip and shaft surface, and this impedance variation is demodulated by the companion 330180/330181 proximitor into a calibrated DC voltage output of 7.87 V/mm (200 mV/mil).

The -CN suffix designates the China-region connector variant, which uses a locally standardized coaxial interface. Electrically and mechanically, the probe is identical to the -00 international variant; only the connector body differs. This makes the 330103-00-10-10-02-CN a direct, zero-recalibration replacement for existing 3300 XL installations in Chinese industrial facilities.

The probe is deployed across steam turbines, gas turbines, centrifugal compressors, axial compressors, boiler feed pumps, and large gearboxes in power generation, petrochemical, LNG, and refinery environments. Its non-contact measurement principle eliminates mechanical wear, making it suitable for continuous, uninterrupted operation across the full machinery lifecycle.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330103-00-10-10-02-CN integrates several hardware-level design decisions that distinguish it from generic eddy current sensors:

Coil Geometry and Field Uniformity: The 8mm probe diameter is selected to balance spatial resolution against measurement range. A smaller coil produces a more concentrated field with higher sensitivity to small gap changes but a narrower linear range. The 8mm geometry achieves a 2.0 mm linear span (0.25–2.25 mm) — sufficient for both radial vibration measurement (typically ±250 µm dynamic range) and static position monitoring (axial thrust, differential expansion).

PEEK Tip Encapsulation: The probe tip is encapsulated in polyether ether ketone (PEEK), a semi-crystalline thermoplastic with a continuous service temperature of 250°C and near-zero dielectric loss at the probe’s operating frequency (typically 1–2 MHz). PEEK’s low relative permittivity (εr ≈ 3.2) ensures that the electromagnetic field geometry at the tip is not distorted by the encapsulant, preserving scale factor accuracy across the full temperature range.

EMC Design — Coaxial Cable Architecture: The integral 1.0 m armored coaxial cable maintains a controlled characteristic impedance from probe coil to connector. The outer armor provides a continuous Faraday shield, attenuating radiated interference from variable-frequency drives (VFDs), high-current bus bars, and adjacent motor windings. This is critical in petrochemical and power plant environments where EMI levels routinely exceed 10 V/m.

316 Stainless Steel Housing: The probe body is machined from 316 stainless steel (UNS S31600), which provides corrosion resistance in H₂S-bearing atmospheres (sour service), steam condensate, and process fluid splash. The M10 × 1.0 thread form is compatible with standard probe holders and armored conduit fittings used across the 3300 XL installation base.

Temperature Compensation: The scale factor of 7.87 V/mm is specified at 25°C for an AISI 4140 target. Bently Nevada’s calibration methodology accounts for the temperature coefficient of the coil resistance and the target material’s permeability variation with temperature. For installations where probe tip temperature exceeds 120°C, the system-level temperature correction factors documented in TDI-8476 must be applied to maintain measurement accuracy within ±1%.

IP67 Sealing at Cable Junction: The most mechanically vulnerable point in any proximity probe is the junction between the probe body and the integral cable. The 330103 series uses an overmolded, hermetically sealed junction rated IP67, preventing moisture ingress in steam-laden or water-spray environments. This eliminates the primary failure mode observed in lower-grade sensors — corrosion-induced impedance drift at the cable-to-coil interface.

System Integration Benefits

• Zero-recalibration replacement: The 330103-00-10-10-02-CN is pin-compatible and electrically identical to all 330103 series variants (excluding connector type). Replacing a failed probe does not require re-entering scale factor or gap calibration data in the 3500 monitor rack — the system resumes operation immediately after gap re-setting.
• Deterministic DC output: The 7.87 V/mm scale factor produces a DC voltage output with no latency, no sampling jitter, and no digital conversion delay. This is essential for machinery protection systems where trip response time must be under 1 ms from gap change to relay output.
• Dual-use measurement: A single probe installation can simultaneously provide radial vibration data (AC component, filtered 1–10,000 Hz) and static position data (DC component) to the 3500 monitor, reducing the total number of penetrations required in the bearing housing.
• Wide frequency bandwidth: The DC-to-10,000 Hz (–3 dB) response covers all relevant machinery fault frequencies: 1× and 2× running speed harmonics, blade-pass frequencies, gear mesh frequencies, and subsynchronous instability modes (oil whirl, oil whip) in fluid-film bearing machines.
• Direct DCS/SIS integration: The –1 to –21 VDC output is compatible with standard 4–20 mA transmitter input cards via the 3500/20 I/O module, enabling direct integration with Siemens PCS 7, Honeywell Experion, ABB 800xA, and other DCS platforms without signal conditioning.
• Diagnostic transparency: The DC gap voltage is continuously readable at the proximitor output connector, allowing field technicians to verify probe gap, cable continuity, and proximitor health with a standard digital multimeter — no specialized diagnostic equipment required.
• ATEX-rated for hazardous areas: The probe carries ATEX certification for use in Zone 1/Zone 2 classified areas, enabling installation in compressor seal gas systems, turbine lube oil enclosures, and other potentially explosive atmospheres without additional intrinsic safety barriers at the probe level.
• Long-term measurement stability: The non-contact eddy current principle produces no mechanical hysteresis, no zero-point drift from contact wear, and no sensitivity degradation from particulate contamination on the probe tip (provided the tip-to-shaft gap is maintained). Field experience across the 3300 XL installed base documents mean time between failures (MTBF) exceeding 100,000 operating hours in clean, properly gapped installations.

Quality Assurance & Global Logistics

Every 330103-00-10-10-02-CN unit supplied through siemensplc.com is sourced from verified Bently Nevada (Baker Hughes) authorized distribution channels. Each unit is inspected prior to dispatch:

• Visual inspection of probe tip, PEEK encapsulant, housing threads, and CN connector for mechanical damage
• Coaxial cable continuity and shield integrity check
• Part number label and date code verification against procurement documentation
• OEM or equivalent anti-static protective packaging confirmed intact

A 12-month warranty covers manufacturing defects from the date of shipment. Certificate of conformance is provided with every order; NIST-traceable calibration documentation is available upon request.

Shipments originate from our warehouse in Xiamen, China. Standard orders ship within 1–3 business days via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. Full export documentation — commercial invoice, packing list, certificate of origin — is prepared for all international consignments. Customs HS code 9031.80 applies. For urgent plant shutdown requirements, same-day dispatch is available for in-stock units confirmed before 14:00 CST.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.