Bently Nevada 330103-00-08-10-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330103-00-08-10-02-00 — 8mm Eddy-Current Proximity Transducer for Rotating Machinery Protection

The 330103-00-08-10-02-00 is an 8mm-diameter eddy-current proximity transducer manufactured by Bently Nevada (Baker Hughes) as a core sensing element within the 3300 XL Proximity Transducer System. Its function within a machinery protection control loop is to generate a continuous, non-contacting DC voltage signal proportional to the instantaneous gap between the transducer tip and a conductive target surface — typically the shaft journal of a rotating machine. This signal is the primary input to radial vibration, axial position, and differential expansion measurement channels in API 670-compliant protection systems.

The part number 330103-00-08-10-02-00 encodes the following configuration: 8mm tip diameter, 10mm linear measurement range, 2-metre integral armoured cable, and M10×1 metric thread body. This configuration is the most widely deployed variant in the 3300 XL family, covering the majority of turbomachinery shaft monitoring applications in power generation, upstream and downstream oil and gas, petrochemical processing, and heavy industrial rotating equipment.

Within the three-component eddy-current measurement chain — transducer, extension cable, and proximitor/oscillator-demodulator — the 330103-00-08-10-02-00 is the field-mounted sensing element. It operates in conjunction with a matched 3300 XL 8mm proximitor (such as the 330180-91-00) and a 330130-series extension cable. The proximitor supplies –24 VDC excitation to the transducer’s internal oscillator coil, and the transducer returns a modulated signal whose amplitude is a direct function of target proximity. The proximitor demodulates this signal and outputs a calibrated DC voltage at a scale factor of 7.87 V/mm (200 mV/mil), which feeds directly into 3500 or 3300 series rack monitor input channels for alarm and trip processing.

The transducer’s 10mm linear range and 1.27mm nominal installation gap provide a measurement window that accommodates both normal shaft dynamic motion and the static position shifts associated with thermal growth, bearing wear, and thrust collar displacement. The DC-to-10,000 Hz frequency response captures the full spectrum of vibration phenomena relevant to rotating machinery diagnostics: sub-synchronous instabilities (oil whirl, oil whip), synchronous 1X unbalance response, super-synchronous blade-pass and gear-mesh frequencies, and high-frequency structural resonances.

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

Technical Parameters

Hardware Logical Analysis

The 330103-00-08-10-02-00 transducer body houses a precision-wound sensing coil embedded in a ceramic-filled epoxy tip assembly. The coil forms the inductive element of an LC oscillator circuit whose resonant frequency is nominally 1.0 MHz. When the transducer tip is positioned within the linear range of a conductive target, eddy currents induced in the target surface load the oscillator coil, reducing its effective Q factor and shifting the oscillator amplitude. This amplitude modulation is the raw signal transmitted via the integral cable to the proximitor for demodulation.

The 2-metre integral armoured cable is a coaxial construction with a characteristic impedance matched to the 3300 XL system calibration. The cable shield is bonded to the transducer body at the tip end and to the connector shell at the proximitor end, providing a continuous Faraday shield along the entire signal path. This construction attenuates capacitively coupled interference from adjacent power cables and motor drives — a critical requirement in turbine control panels where 480 VAC motor feeders and 24 VDC instrumentation cables share the same cable tray infrastructure.

The M10×1 metric thread body allows precise axial positioning of the transducer tip relative to the target surface using a locknut-and-jam-nut arrangement. The thread pitch of 1.0 mm per revolution provides fine gap adjustment resolution: one full rotation of the transducer body changes the gap by exactly 1.0 mm, corresponding to a 7.87 V change in output — a relationship that allows field technicians to set the nominal gap voltage of −10.0 VDC (corresponding to 1.27 mm gap) with a calibrated multimeter and no additional tooling.

The ceramic-filled epoxy tip material provides electrical isolation between the sensing coil and the machine casing, preventing ground loop currents from corrupting the measurement signal. The tip material also exhibits a low coefficient of thermal expansion, maintaining dimensional stability across the full −35 °C to +177 °C operating range. This thermal stability is essential in hot-section installations — such as gas turbine bearing housings — where ambient temperatures can cycle between ambient and 150 °C during start-stop sequences, and where dimensional changes in the transducer tip would introduce a temperature-dependent offset error in the gap measurement.

IP67 sealing is achieved through a dual-seal arrangement: a fluorosilicone O-ring at the cable entry point and a hermetic epoxy encapsulation of the coil assembly within the tip body. Fluorosilicone retains its sealing properties across the full operating temperature range and resists degradation from turbine lube oil, synthetic lubricants (PAO, PAG), and process gas condensates — the primary fluid exposure environments in turbomachinery bearing housings.

System Integration Benefits

• Direct API 670 compliance without supplementary hardware: The 330103-00-08-10-02-00, when installed with a matched 3300 XL proximitor and extension cable, constitutes a complete API 670 Fifth Edition-compliant measurement channel. No additional signal conditioning, isolation barriers, or impedance matching networks are required between the transducer output and the 3500 rack monitor input.
• Deterministic measurement latency: The eddy-current sensing principle produces a continuous analog output with no sampling delay. The DC-to-10 kHz frequency response ensures that the monitor receives a real-time representation of shaft position at every point in the measurement cycle, supporting the sub-millisecond trip response times required by API 670 for critical machinery protection.
• Zero mechanical wear and maintenance-free operation: Non-contacting measurement eliminates all tribological wear mechanisms. The transducer has no moving parts, no contact surfaces, and no consumable elements. In continuous-duty installations — such as baseload power generation turbines operating 8,000+ hours per year — the transducer requires no scheduled maintenance beyond periodic gap voltage verification during planned outages.
• Simultaneous static and dynamic measurement from a single channel: The DC-coupled output carries both the static gap voltage (shaft centerline position) and the dynamic AC component (vibration amplitude and phase). A single transducer channel therefore provides axial position, radial vibration amplitude, 1X vector, and DC gap data simultaneously — reducing the total transducer count required per bearing journal compared to AC-coupled sensor technologies.
• Target material traceability for calibration integrity: The standard calibration target material (AISI 4140 steel) is specified in the part number configuration. When the installed shaft material matches the calibration target, the 7.87 V/mm scale factor is accurate to ±1% across the full linear range without field recalibration. This eliminates the calibration uncertainty that arises when non-standard target materials are used without applying the documented correction factors from Bently Nevada TN-13.
• Plug-compatible replacement for existing 3300 XL installations: The 330103-00-08-10-02-00 is dimensionally and electrically identical to all previous 3300 XL 8mm transducer variants with the same cable length and thread configuration. Replacement requires only gap re-verification — no monitor reconfiguration, no scale factor adjustment, and no software parameter changes in the 3500 rack.
• Wide operating temperature range for hot-section and cryogenic applications: The −35 °C to +177 °C operating range covers both cryogenic pump installations (LNG, liquid nitrogen service) and high-temperature bearing housing environments in gas turbines and steam turbines. A single transducer variant serves both application extremes, simplifying spare parts inventory management.
• Integral cable eliminates field-assembly error sources: The 2-metre armoured cable is factory-assembled and tested as a matched unit with the transducer coil. Field-assembled cable connections — a known source of impedance mismatch, moisture ingress, and intermittent contact faults — are eliminated. The integral assembly also ensures that the total cable system length presented to the proximitor is within the calibrated range without requiring field measurement or documentation of cable lengths.

Quality Assurance & Global Logistics

Each 330103-00-08-10-02-00 unit dispatched from our Xiamen, China facility is sourced through verified supply channels: authorized Baker Hughes / Bently Nevada distribution partners, decommissioned OEM-maintained assets with traceable service histories, and ISO 9001-certified repair and refurbishment facilities. Every unit undergoes a structured pre-shipment inspection protocol covering part number and date code marking verification, cable assembly continuity and shield integrity testing, tip dimensional inspection against OEM reference drawings, connector mechanical condition assessment, and visual screening against known counterfeit indicators specific to the 3300 XL transducer family.

Units are individually packaged in IEC 61340-compliant ESD-safe anti-static bags with desiccant, placed in foam-lined double-wall corrugated cartons, and stored in a climate-controlled warehouse prior to dispatch. Full export documentation — commercial invoice, packing list, HS code 9026.80 classification, and certificate of origin — is prepared as standard for every international shipment. Preferred express carriers include DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with typical door-to-door transit times of 3–5 business days to Europe, North America, the Middle East, and Southeast Asia. A 12-month warranty against defects in materials and workmanship is provided from the invoice date. Certificate of conformance and pre-shipment inspection report are available upon request for regulated industries, EPC project documentation packages, and asset management records.

Contact Information

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