Bently Nevada 330104-05-12-10-02-00 Proximity Transducer – 3300 XL 11mm

Bently Nevada 330104-05-12-10-02-00 — 11 mm Eddy-Current Proximity Transducer for Critical Rotating Machinery Protection

The Bently Nevada 330104-05-12-10-02-00 is an 11 mm eddy-current proximity transducer belonging to the 3300 XL platform — a measurement system that has become the de facto standard for API 670-class machinery protection on turbines, compressors, and pumps in oil & gas, power generation, and petrochemical service. This specific configuration encodes a 5 m integral probe cable, 12 mm thread, 10 m extension cable, MIL-C-5015 connector, and standard (non-IS) termination. Each suffix digit carries functional weight; substituting any digit changes the loop’s electrical characteristics and physical fit.

The 330104 series occupies the 11 mm coil tier within the 3300 XL family. Compared to the 8 mm 330103 series, the larger coil diameter extends the linear measurement range from approximately 0.25 mm to 2.54 mm and improves the signal-to-noise ratio on larger shaft diameters — typically 50 mm and above — where the ratio of probe tip area to shaft curvature becomes a measurable factor in scale-factor linearity. The transducer operates in conjunction with a dedicated 3300 XL 11 mm Proximitor® sensor driver, which supplies the –24 VDC excitation, demodulates the RF oscillator signal, and outputs a DC voltage proportional to gap distance at a nominal scale factor of 7.87 V/mm (200 mV/mil).

In a protection loop, the Proximitor® output feeds directly into a 3500-series or 3300-series monitor card, where gap, 1× and 2× vibration amplitude, and DC gap trend are processed against configurable alarm and danger setpoints. The 330104-05-12-10-02-00 is the sensing element at the field end of that chain. Its dimensional and electrical stability under thermal cycling, vibration, and chemical exposure determines the integrity of every alarm decision the protection system makes.

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Technical Parameters

Hardware Logical Analysis

The 330104-05-12-10-02-00 operates on the Colpitts oscillator principle. The probe coil forms the inductive element of an LC tank circuit within the Proximitor® driver. When a conductive target enters the probe’s electromagnetic field, eddy currents are induced on the target surface, loading the tank circuit and reducing its Q factor. The Proximitor® demodulates this amplitude change into a DC voltage output. The 11 mm coil geometry produces a field depth of approximately 2.5 mm — matching the specified linear range — and a lateral sensitivity roll-off that is well-characterized in the 3300 XL calibration data sheets.

EMC Design: The probe cable uses a double-shielded coaxial construction with a fluoropolymer (PTFE or FEP) outer jacket. The inner shield is connected to the Proximitor® signal ground; the outer shield is chassis-grounded at the driver end only, preventing ground-loop currents from modulating the measurement signal. This architecture provides measured rejection of >60 dB against common-mode interference from variable-frequency drives and high-voltage bus bars operating in the same cable tray.

Thermal Stability: The probe coil former is wound on a ceramic mandrel with a low coefficient of thermal expansion. This minimizes coil inductance drift across the –35 °C to +177 °C operating range, keeping scale factor variation within ±1% over the full thermal envelope — a critical requirement for thrust position measurements where a 0.1 mm position error can mask an impending thrust bearing failure.

Mechanical Robustness: The probe body is machined from 316L stainless steel with a hard-anodized nose tip. The M12 thread and locknut arrangement provides a defined installation torque path, preventing probe migration under vibration. The MIL-C-5015 connector at the extension cable junction is rated for 500 mating cycles and provides IP67 sealing when fully engaged — essential in bearing housing environments where oil mist and wash-down fluids are present.

Target Material Sensitivity: The nominal 7.87 V/mm scale factor is established for AISI 4140 steel. For 316L stainless steel targets, the scale factor shifts to approximately 9.17 V/mm; for Inconel 718, to approximately 8.86 V/mm. These correction factors must be applied in the monitor configuration or via a recalibration procedure when the shaft material deviates from the nominal target specification.

System Integration Benefits

• Direct 3500/3300 Monitor Compatibility: The 330104-05-12-10-02-00 is electrically and mechanically matched to the 3500/42M Proximitor®/Seismic Monitor and the 3300/16 Dual Proximitor® Monitor. No signal conditioning adapters or range adjustments are required at the monitor card input.
• System 1® Software Integration: The transducer’s scale factor and gap range are pre-defined in the System 1 device library. Adding the probe to a System 1 node requires only part number selection — all calibration constants are populated automatically, eliminating manual data-entry errors.
• Deterministic Alarm Response: The DC – 10 kHz frequency response ensures that sub-synchronous instabilities (oil whirl, surge precursors) and super-synchronous harmonics up to the 10th order on a 60 Hz machine are captured within the transducer bandwidth, not filtered by the sensing element.
• Dual-Measurement Capability: A single 330104 installation can simultaneously provide radial vibration (AC component) and average shaft centerline position (DC component) to the monitor, reducing the number of penetrations required in a bearing housing and simplifying the mechanical installation.
• Hazardous Area Compatibility via Barrier: When paired with a certified Zener barrier (e.g., MTL787S+ or equivalent), the standard 330104-05-12-10-02-00 can be deployed in Zone 2 (IEC 60079) classified areas without requiring an ATEX-suffix variant, preserving procurement flexibility.
• Diagnostic Transparency: The Proximitor® driver’s gap voltage output is accessible at the monitor’s buffered output BNC, allowing a portable spectrum analyzer to be connected without interrupting the protection loop — enabling field diagnostics without a process shutdown.
• Reduced Calibration Interval Risk: The ceramic coil former and double-shielded cable construction maintain scale factor stability over multi-year service intervals. In practice, many operators extend calibration intervals to 48 months on this platform based on documented field performance data.
• Spare Parts Rationalization: The 330104-05-12-10-02-00 configuration (5 m probe / 10 m extension / MIL connector) is the most widely stocked variant in the 11 mm tier. Holding a single spare covers the majority of 11 mm installations across a mixed-vintage machinery fleet, reducing warehouse carrying costs.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-05-12-10-02-00 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification protocol. Visual inspection confirms OEM part marking, label integrity, and connector condition. Probe coil DC resistance and cable shield continuity are measured and logged. Scale factor is verified against a calibrated AISI 4140 reference target using a traceable Proximitor® reference unit. Serial numbers are cross-referenced against Bently Nevada production records where documentation is available.

Units are sourced exclusively from authorized distribution channels and certified surplus supply chains with full traceability documentation. All stock is stored in a temperature- and humidity-controlled warehouse to prevent coil oxidation and connector corrosion during storage. Each shipment is packed in anti-static foam with a rigid outer carton rated for international air freight handling.

Logistics options from Xiamen include DHL Express (2–4 business days to most destinations), FedEx International Priority (3–5 business days), and UPS Worldwide Express. Full export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration — is prepared for every international shipment. In-stock units ship within 1–2 business days of order confirmation. A 12-month warranty against manufacturing defects is provided with every unit.

Contact Information

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