Bently Nevada 330103-02-12-10-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330103-02-12-10-02-00 — Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330103-02-12-10-02-00 is a 5 mm tip-diameter, non-contact eddy-current proximity probe with an integrated 2-metre (80-inch) armored extension cable, factory-calibrated to a nominal sensitivity of 200 mV/mil (7.87 V/mm). It belongs to the 3300 XL platform — Baker Hughes Bently Nevada’s established standard for shaft radial vibration, axial position, and differential expansion measurement in API 670-compliant machinery protection systems.

Within a control loop, this probe functions as the primary transducer in a three-component eddy-current chain: the probe tip generates a high-frequency electromagnetic field (nominally 1.0 MHz oscillation frequency); changes in the conductive target gap modulate the coil impedance; the integrated extension cable transmits the modulated RF signal to the companion 3300 XL proximitor driver, which demodulates it into a DC voltage output ranging from –1 VDC (near gap) to –21 VDC (far gap). This analog signal feeds directly into monitor cards, DCS analog input modules, or safety instrumented system (SIS) input channels without additional signal conditioning, preserving measurement latency well below 1 ms — a requirement for machinery trip logic in turbine protection applications.

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Technical Parameters

Hardware Logical Analysis

Oscillator Frequency Locking and Impedance Modulation
The 3300 XL probe tip houses a precision-wound coil embedded in a ferrite-loaded epoxy former. The coil forms part of an LC tank circuit within the proximitor driver, oscillating at approximately 1.0 MHz. When a conductive target enters the electromagnetic field, eddy currents are induced on the target surface, extracting energy from the tank circuit and reducing coil Q-factor. The resulting impedance shift is proportional to the gap distance with high linearity across the 0.25–2.25 mm range. The 5 mm tip geometry is optimized for shaft diameters between 50 mm and 100 mm; for smaller shafts, the curved target surface introduces a geometric correction factor that must be applied during system commissioning.

Armored Cable Signal Integrity
The 2-metre integrated cable is a coaxial assembly with a characteristic impedance of 50 Ω, terminated at the SMA connector. The stainless-steel armor braid provides both mechanical protection and a continuous EMC shield, attenuating externally coupled interference from variable-frequency drives (VFDs), high-current bus bars, and RF transmitters common in industrial environments. Cable capacitance is factory-trimmed to match the proximitor driver’s input impedance, ensuring the calibrated sensitivity of 200 mV/mil is maintained without field adjustment. Substituting a non-matched cable — even of the same physical length — will shift the effective sensitivity and invalidate the factory calibration.

EMC Design and Grounding Architecture
The probe body is constructed from 316L stainless steel, providing a continuous conductive enclosure that acts as a Faraday shield for the coil assembly. The shield is grounded at a single point — the proximitor driver chassis — to prevent ground-loop currents from introducing common-mode noise into the measurement signal. In installations near high-power switchgear, the armored cable should be routed in a dedicated conduit separated by at least 300 mm from power cables rated above 480 VAC, consistent with API 670 Annex D wiring guidelines. The probe’s IP67 rating ensures the coil assembly remains isolated from conductive fluids, preventing leakage paths that would alter the effective coil impedance and corrupt gap readings.

Thermal Stability and Drift Characteristics
The coil former material and winding geometry are selected to minimize the temperature coefficient of inductance across the –35 °C to +177 °C operating range. Bently Nevada specifies a sensitivity drift of less than ±0.5% full-scale over the full temperature range for standard AISI 4140 targets, which translates to a maximum gap error of approximately 10 µm at the extremes of the linear range — acceptable for API 670 alarm and trip setpoint tolerances, which are typically set at ±25 µm from the baseline.

System Integration Benefits

• Zero-latency analog output: The –1 to –21 VDC gap-proportional signal is available continuously with no scan-cycle delay, enabling machinery protection trip logic to respond within one shaft revolution at any operating speed.
• Direct DCS/SIS compatibility: The output voltage range is compatible with standard ±10 V or 0–20 mA analog input cards after a simple signal conditioner; no proprietary interface module is required for integration into third-party control systems.
• Drop-in field replacement: The 330103-02-12-10-02-00 is fully interchangeable with any other 3300 XL 5 mm / 2 m probe within the same platform without re-ranging the proximitor driver, reducing planned maintenance downtime to under 15 minutes per probe point.
• Dual-measurement capability: A single probe installation can simultaneously provide radial vibration (AC component, 10 Hz – 10 kHz) and average shaft centerline position (DC component) to the monitor card, eliminating the need for separate transducers for each measurement function.
• Diagnostic transparency: The DC gap voltage is continuously readable at the proximitor output terminals, allowing maintenance technicians to verify probe-to-shaft gap without interrupting machine operation — a critical capability for online bearing wear trending.
• API 670 alarm/trip setpoint integrity: Factory calibration traceability ensures that alarm and trip setpoints configured in the monitor card correspond to actual shaft displacement values within the ±0.5% full-scale accuracy specification, supporting regulatory compliance documentation.
• Hazardous area deployment: ATEX certification (zone classification per product datasheet) permits installation in Zone 1 and Zone 2 classified areas without additional intrinsic safety barriers when paired with the appropriate certified proximitor driver.
• Long-term measurement stability: The non-contact sensing principle eliminates mechanical wear at the measurement point; probe service life in clean industrial environments routinely exceeds 10 years without recalibration, reducing lifecycle cost per measurement point compared to contact-type displacement sensors.

Quality Assurance & Global Logistics

Every 330103-02-12-10-02-00 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment inspection protocol: tip coil continuity and insulation resistance are verified; cable armor integrity and SMA connector torque are checked; serial number and date code are cross-referenced against Baker Hughes Bently Nevada factory documentation where available. New-in-box stock is supplied in original OEM packaging with factory calibration data. Surplus and refurbished units are inspected, cleaned, and function-tested against the 200 mV/mil sensitivity specification before dispatch.

Shipments are consolidated and dispatched from Xiamen via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, with typical transit times of 3–5 business days to Europe and North America, and 2–4 business days to Southeast Asia. All shipments include a commercial invoice, packing list, and inspection report. Calibration certificates, material test reports, and OEM datasheets are available on request and can be included in the shipment documentation package for regulatory or insurance purposes.

Export classification: EAR99 (no U.S. export license required for most destinations). Customers in regions subject to trade controls should contact us prior to ordering to confirm compliance requirements. A 12-month warranty covers defects in materials and workmanship from the dispatch date; warranty claims are processed with a target replacement or credit resolution within 5 business days of confirmed defect verification.

Contact Information

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