Bently Nevada 330104-00-02-10-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-02-10-02-00 — 8 mm Eddy Current Proximity Probe in the 3300 XL Transducer System

The 330104-00-02-10-02-00 is an 8 mm eddy current proximity probe manufactured by Bently Nevada (a Baker Hughes business) and is the primary sensing element within the 3300 XL Proximity Transducer System. In a machinery protection architecture, this probe occupies the first stage of a three-component signal chain: it generates a high-frequency electromagnetic field, detects the impedance perturbation caused by a conductive target surface, and passes that raw RF signal downstream to a matched proximitor for demodulation into a calibrated DC voltage. The output of that chain feeds directly into API 670-compliant monitoring racks — including the Bently Nevada 3500 series — where it drives alarm, trip, and condition-monitoring logic for rotating machinery assets.

This specific part number encodes a defined mechanical and electrical configuration: 8 mm probe tip diameter, 2.0 m integral cable, standard armored construction, and factory calibration for a nominal scale factor of 7.87 V/mm (200 mV/mil). The probe is designed for continuous, non-contact operation in environments where bearing journal orbits, shaft axial position, differential expansion, and rotor eccentricity must be measured without introducing any mechanical loading on the observed shaft. Non-contact measurement eliminates wear as a failure mode for the sensor itself, making this probe suitable for indefinite service life under normal operating conditions.

Deployment environments include steam turbines, gas turbines, centrifugal and axial compressors, large pumps, gearboxes, and hydro turbines — any rotating asset where API 670 machinery protection is specified or where continuous vibration surveillance is required by insurance, regulatory, or OEM maintenance standards. The probe’s rated operating temperature of –35 °C to +177 °C covers hot-section bearing-proximity installations and cold-climate outdoor machinery without derating.

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Technical Parameters

Hardware Logical Analysis

The eddy current sensing mechanism in the 330104-00-02-10-02-00 operates on the principle of mutual inductance perturbation. The probe coil, embedded in the tip assembly and potted in a chemically resistant compound, is driven by the proximitor’s oscillator at a fixed frequency — typically in the range of 500 kHz to 2 MHz depending on the 3300 XL system variant. When the probe tip is positioned within its linear range of a conductive target, eddy currents are induced in the target surface. These eddy currents generate a counter-magnetic field that reduces the effective inductance of the probe coil. The proximitor’s demodulator circuit measures this inductance change as a voltage shift, producing the calibrated output signal.

EMC Design: The armored cable construction provides a continuous Faraday shield from the probe body to the proximitor input, suppressing capacitively coupled interference from adjacent high-voltage cables, variable-frequency drives, and ignition systems common in turbomachinery enclosures. The coaxial signal path maintains a controlled characteristic impedance, preventing reflections that would introduce measurement error at high shaft rotational frequencies. The probe body itself is constructed from 316 stainless steel, which is non-magnetic and does not perturb the eddy current field, ensuring that the probe housing does not contribute to measurement offset.

Thermal Stability: The probe coil winding uses a temperature-compensated wire alloy, and the potting compound has a coefficient of thermal expansion matched to the coil former material. This minimizes thermally induced dimensional changes in the coil geometry that would otherwise shift the scale factor across the operating temperature range. The result is a scale factor drift specification that remains within the ±0.5% tolerance band from –35 °C to +177 °C without field recalibration.

Target Material Sensitivity: The eddy current field penetration depth (skin depth) is a function of target material conductivity and permeability. The 3300 XL system is factory calibrated against AISI 4140 steel per API 670 Annex D. When the target material deviates from this reference — for example, when monitoring titanium impellers or Inconel shafts — a material correction factor must be applied. The proximitor’s calibration curve is specific to the probe-cable-proximitor system length; mixing components from different system length configurations introduces a systematic scale factor error that cannot be corrected by gap adjustment alone.

Redundancy Architecture Compatibility: In dual-voting or 2-of-3 protection architectures, multiple 330104-00-02-10-02-00 probes are mounted at 90° intervals around the shaft journal. Each probe feeds an independent proximitor and monitor channel. The monitor’s voting logic compares the three channel outputs; a single probe failure or signal dropout triggers a maintenance alert without initiating a spurious trip, preserving plant availability while maintaining protection integrity. This probe’s consistent scale factor across units — ensured by individual factory calibration — is a prerequisite for accurate voting logic operation.

System Integration Benefits

• Zero mechanical loading on the observed shaft — Non-contact measurement principle means the probe exerts no force on the rotating element, eliminating any sensor-induced influence on the vibration signature being measured.
• DC to 10 kHz bandwidth — Captures the full spectrum of rotating machinery events: sub-synchronous instabilities (oil whirl, surge), synchronous 1× and 2× components, blade-pass frequencies, and gear mesh harmonics up to 10,000 Hz without anti-aliasing concerns at typical machinery speeds.
• API 670 drop-in compatibility — The 330104-00-02-10-02-00 is a direct replacement for existing 3300 XL probe installations. No recalibration of the proximitor or monitor is required provided the total system cable length is preserved, reducing planned maintenance downtime to the time required for physical probe replacement only.
• Deterministic signal latency — The analog output of the proximitor is available with a propagation delay determined solely by the demodulator filter bandwidth, typically less than 1 ms. This deterministic latency is essential for machinery protection systems where trip response time is specified in milliseconds.
• Diagnostic transparency via gap voltage monitoring — The DC component of the proximitor output represents the static gap. Monitoring this DC level over time provides a direct, quantitative indicator of bearing wear, shaft centerline migration, and probe mounting drift — without requiring additional instrumentation.
• High-temperature bearing-proximity installation — The +177 °C rating allows probe installation in bearing housings adjacent to steam turbine exhaust ends and gas turbine hot sections where ambient temperatures exceed the capability of standard industrial sensors.
• Chemical resistance in process environments — The 316 SS probe body and armored cable withstand continuous exposure to H₂S, hydrocarbon condensate, lubricating oil, and high-humidity atmospheres without degradation of the probe tip geometry or cable insulation integrity.
• System-level interchangeability within the 3300 XL ecosystem — The probe is fully interchangeable with other 330104-series probes of the same cable length, enabling standardized spare-parts inventory across multiple machine trains and reducing the number of distinct part numbers held in the maintenance storeroom.
• Individual factory calibration traceability — Each probe ships with a calibration certificate traceable to national measurement standards. This documentation satisfies the calibration record requirements of ISO 55001 asset management systems and supports audit readiness without additional field calibration effort.
• Compatibility with System 1 condition monitoring software — The analog output integrates directly with Bently Nevada System 1 Evolution software for trend analysis, alarm management, and machinery diagnostics, enabling predictive maintenance workflows without signal conditioning adapters.

Quality Assurance & Global Logistics

Every 330104-00-02-10-02-00 unit dispatched from our Xiamen, China facility is a genuine Bently Nevada (Baker Hughes) component sourced through verified supply channels. Prior to dispatch, each unit undergoes a multi-point inspection protocol: physical integrity of the probe body and tip, connector geometry verification against OEM dimensional drawings, cable armor continuity check, and label authenticity screening including date code and serial number cross-reference. Units that do not pass all inspection criteria are quarantined and not offered for sale.

Packaging follows anti-static and mechanical protection standards appropriate for precision instrumentation: individual probe assemblies are wrapped in anti-static foam, placed in rigid-wall cartons, and sealed with tamper-evident tape. The original factory label, serial number, and calibration documentation are preserved inside the package. For international shipments, export documentation — including commercial invoice, packing list, and HS code declaration — is prepared in compliance with Chinese customs regulations and the import requirements of the destination country.

Logistics partners include DHL Express, FedEx International Priority, and UPS Worldwide Express, with typical transit times of 3–5 business days to Europe, North America, Southeast Asia, and the Middle East. For time-critical plant shutdowns, same-day dispatch is available for orders confirmed before 14:00 CST. All shipments are fully insured and tracked from dispatch to delivery confirmation.

The 12-month warranty covers manufacturing defects and verifiable performance deviations from the published specification. Warranty claims are processed with a target response time of 48 hours from 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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