Bently Nevada 330103-00-03-10-01-00 Proximity Probe – 3300 XL 8mm

Bently Nevada 330103-00-03-10-01-00 — 8mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The Bently Nevada 330103-00-03-10-01-00 is an 8mm diameter eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. Within a machinery protection architecture, this probe functions as the primary sensing element responsible for converting mechanical displacement into a proportional DC voltage signal. It operates on the principle of electromagnetic induction: a high-frequency oscillating magnetic field generated at the probe tip induces eddy currents in the conductive target surface (typically a shaft journal), and the resulting impedance change is processed by the paired Proximitor® sensor into a calibrated output. The probe’s 1.0-metre integral cable connects directly to a 330130-series extension cable, which in turn feeds the 330180 or 330181 Proximitor® sensor mounted in a junction box or instrument enclosure. This three-component architecture — probe, extension cable, Proximitor® — forms a complete transducer system whose output is consumed by Bently Nevada 3500-series monitoring racks for real-time vibration, eccentricity, and axial position measurement.

In a typical turbomachinery protection loop, the 330103-00-03-10-01-00 is installed radially at the bearing journal, oriented 90° from a second probe to provide X–Y vibration vectors. The Proximitor® sensor converts the probe’s impedance signal into a –24 VDC-referenced output at 200 mV/mil (7.87 V/mm) sensitivity. This signal is wired to a 3500/40M or 3500/42M monitor card, which applies alert and danger setpoints, executes relay logic, and transmits data to the plant DCS or historian via 4–20 mA or Modbus. The non-contact measurement principle means zero mechanical loading on the shaft, zero wear on the sensing element, and a frequency response flat from DC to well above the running speed harmonics of most industrial rotating equipment.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-03-10-01-00 probe body is machined from 316 stainless steel, providing corrosion resistance in environments exposed to lube oil, process gas condensate, and steam. The probe tip geometry is precision-ground to maintain a consistent electromagnetic field profile across the full linear range. Dimensional tolerance on the tip diameter is held to ±0.05 mm, which directly governs the uniformity of the eddy-current field and, consequently, the linearity error of the output signal.

The integral coaxial cable uses a low-loss dielectric with a characteristic impedance matched to the 330130 extension cable, ensuring that signal attenuation across the combined cable run remains within the system’s calibration envelope. The reverse SMA connector at the cable terminus provides a positive-locking, vibration-resistant interface that maintains contact integrity under the mechanical shock and vibration levels typical of turbomachinery bearing housings — environments where connector fretting is a documented failure mode in lower-grade sensors.

EMC performance is achieved through the coaxial cable shield, which provides continuous 360° coverage from the probe body to the Proximitor® sensor input. This shielding architecture attenuates capacitively coupled interference from adjacent high-voltage cables and variable-frequency drives, which are common noise sources in compressor and turbine control rooms. The probe’s oscillator frequency (nominally 1.0 MHz for the 8mm series) is selected to maximize sensitivity to the target material’s conductivity while minimizing susceptibility to external RF fields in the industrial frequency bands.

The M10 × 1.0 thread allows precise gap adjustment during installation. The standard installed gap for the 330103-00-03-10-01-00 is 1.27 mm (50 mil), corresponding to a Proximitor® output of approximately –10.5 VDC at the midpoint of the linear range. This midpoint bias ensures that the full dynamic range of shaft vibration — both positive and negative displacement excursions — can be captured without clipping at the output limits of –1 VDC or –21 VDC.

System Integration Benefits

• Deterministic signal latency: The eddy-current transducer chain from probe tip to Proximitor® output introduces less than 100 µs of signal delay, ensuring that the 3500-series monitor receives displacement data within the same shaft revolution cycle in which it occurs — critical for overspeed and high-vibration trip logic.
• Zero-wear sensing element: Non-contact operation eliminates the mechanical degradation that affects contact-type sensors, maintaining calibration accuracy over multi-year continuous operation without scheduled replacement intervals.
• Direct drop-in compatibility: The 330103-00-03-10-01-00 is dimensionally and electrically interchangeable with all other 3300 XL 8mm probes, allowing replacement without recalibration of the Proximitor® sensor or reconfiguration of the 3500-series monitor card.
• Dual-plane vibration coverage: Two probes installed at 90° provide orthogonal X–Y displacement vectors, enabling orbit plot generation in the 3500 system — a diagnostic tool that distinguishes unbalance, misalignment, rub, and fluid instability by shaft orbit shape.
• Axial position measurement capability: When installed in the thrust bearing plane, the same probe model measures rotor axial position with the same 7.87 V/mm sensitivity, providing thrust load monitoring without a separate sensor family.
• Broad temperature envelope: The –35°C to +177°C probe tip rating covers cryogenic compressor applications at the low end and steam turbine bearing housings at the high end, eliminating the need for application-specific sensor variants.
• Diagnostic transparency via gap voltage: The DC component of the Proximitor® output represents the static probe-to-shaft gap. Trending this value over time reveals shaft centerline migration caused by bearing wear, providing advance warning of bearing failure before vibration amplitude increases.
• API 670 compliance: The transducer system meets the performance requirements of API Standard 670 (Machinery Protection Systems), ensuring acceptance by EPC contractors and plant inspection authorities without additional qualification testing.

Quality Assurance & Global Logistics

Every 330103-00-03-10-01-00 unit dispatched from our Xiamen, China facility is sourced through verified supply channels with full traceability documentation. Prior to shipment, each probe undergoes a four-stage inspection protocol: label and date-code authentication, connector and cable integrity check, housing dimensional verification, and packaging seal inspection. Units are stored in a climate-controlled warehouse to prevent moisture ingress and electrostatic damage to the coaxial connector.

Shipments are dispatched via DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with typical transit times of 3–5 business days to Europe, North America, and Southeast Asia. Full export documentation — commercial invoice, packing list, certificate of origin, and HS Code 9031.80 declaration — is prepared for every international order. Expedited processing is available for plant emergency requirements. A 12-month warranty covers manufacturing defects and verified supply-chain authenticity from the date of shipment.

Contact Information

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