Bently Nevada 330173-00-06-10-02-00 Proximity Probe – 3300 XL Series

330173-00-06-10-02-00 — Non-Contact Shaft Displacement Sensing in API 670 Machinery Protection Loops

The Bently Nevada 330173-00-06-10-02-00 is an 8mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It functions as the primary sensing element in continuous, non-contact measurement of radial shaft vibration, average shaft centerline position, and differential shaft eccentricity on critical rotating machinery. The probe operates on the eddy-current induction principle: a high-frequency alternating magnetic field — generated by a resonant LC oscillator circuit within the paired driver/oscillator — projects from the wound coil at the probe tip into the conductive target surface. As the air gap between probe tip and shaft changes, the eddy-current loading on the coil alters the oscillator’s tank circuit impedance. The driver converts this impedance variation into a linear, negative-slope DC voltage output: the closer the target, the more negative the output voltage.

This measurement architecture requires no mechanical contact with the rotating shaft, eliminating wear, friction-induced measurement error, and the installation constraints associated with contacting displacement sensors. The 330173-00-06-10-02-00 is factory-calibrated against AISI 4140 alloy steel targets — the standard reference material specified in API 670 — and ships as a matched probe-cable assembly with a 6 ft (1.83 m) integral cable terminated in a 2-pin MIL-C-26482 Series I connector (shell size 02). The 10-32 UNF threaded body allows precise axial positioning during installation, with each thread revolution advancing the probe tip by 0.794 mm — enabling the technician to set the nominal air gap to the calibrated center of the linear range (approximately 1.0 mm) with repeatable mechanical precision.

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Technical Parameters

Hardware Logical Analysis

Coil Geometry and Active Zone Definition
The sensing coil wound within the 330173-00-06-10-02-00 tip is potted in a thermally stable, low-outgassing epoxy matrix. The 8mm active diameter defines the probe’s spatial sensitivity footprint: the eddy-current field penetrates the target to a skin depth (δ) governed by δ = 1/√(π·f·μ·σ), where f is the oscillator frequency, μ is the target permeability, and σ is the target conductivity. For AISI 4140 steel at 1.0 MHz, δ ≈ 8–12 μm. This shallow penetration depth means the probe responds exclusively to surface displacement, not bulk material movement — a critical characteristic for accurate shaft vibration measurement where surface finish and material homogeneity directly affect calibration accuracy.

PTFE Cable Dielectric and Signal Integrity
The integral cable’s PTFE jacket maintains a dielectric constant of approximately 2.1 across the 1.0–1.5 MHz oscillator band, compared to PVC at εr ≈ 3.5–4.5. This lower dielectric constant reduces distributed cable capacitance per unit length, which would otherwise detune the driver’s resonant circuit and shift the probe’s effective sensitivity. The 6 ft cable run is within the 3300 XL system’s specified cable length budget, ensuring the driver’s automatic gain control (AGC) loop can compensate for cable impedance without saturating. The braided shield, referenced to driver chassis ground, provides >40 dB common-mode rejection of radiated interference from adjacent variable-frequency drives and power cables operating at 50/60 Hz and their harmonic frequencies.

MIL-C-26482 Connector Contact Resistance and Mechanical Retention
The gold-plated 2-pin connector contacts maintain contact resistance below 5 mΩ across the operating temperature range. At the probe’s signal current levels (typically <10 mA), a 5 mΩ contact resistance introduces a voltage drop of <50 μV — negligible relative to the driver’s output noise floor of approximately 5 mV RMS. The bayonet locking mechanism is rated for axial pull forces exceeding 45 N, preventing accidental disconnection in high-vibration bearing housing environments where probe cables are subject to continuous mechanical excitation at shaft rotational frequency and its harmonics.

EMC Architecture and Magnetic Shielding
The 316L stainless steel probe body provides a degree of magnetic shielding against low-frequency stray fields from motor windings and transformer cores. The coaxial cable construction — center conductor carrying the oscillator signal, surrounded by a grounded braided shield — attenuates common-mode interference to levels below the driver’s input sensitivity threshold. In installations where radiated field strengths exceed 10 V/m (e.g., near large variable-speed drives), the probe’s coaxial architecture maintains measurement accuracy within the API 670 ±1% full-scale specification without requiring additional shielding conduit.

System Integration Benefits

• Factory-Matched Calibration with 3300 XL Drivers: The 330173-00-06-10-02-00 is calibrated as a system with Bently Nevada 330180-series drivers. The matched calibration eliminates field sensitivity trimming and ensures the combined transducer system meets API 670 accuracy requirements without additional commissioning adjustments.
• Simultaneous Static and Dynamic Measurement on One Channel: The DC-coupled output (DC to 10,000 Hz) captures shaft centerline position (a quasi-static signal reflecting bearing load and thermal growth) and dynamic vibration (1× and higher-order components) on a single wiring pair, reducing terminal block count and cable tray fill compared to dual-transducer architectures.
• Effective Displacement Resolution of ~0.6 μm: At 7.87 V/mm sensitivity and a driver output noise floor of <5 mV RMS, the system resolves shaft displacements of approximately 0.6 μm — enabling detection of incipient bearing wear at vibration amplitudes well below API 670 alert thresholds, supporting condition-based maintenance intervals.
• Thermal Stability Across Bearing Housing Temperature Extremes: The –35°C to +177°C operating range covers bearing housing temperatures in cryogenic service compressors (LNG, ethylene) through high-pressure steam turbine applications, eliminating probe cooling provisions and associated maintenance complexity.
• ATEX/IECEx Certification Reduces Barrier BOM: Zone 1/Zone 2 approval allows direct installation in classified areas in most configurations without intrinsic safety barriers, reducing panel space, wiring cost, and the voltage drop penalty associated with Zener barrier circuits.
• API 670 Compliance Streamlines Engineering Documentation: Documented compliance with API 670 (5th Edition) transducer accuracy requirements simplifies machinery protection system engineering packages, insurance audits, and third-party inspection sign-off for new installations and plant expansions.
• Serialized Traceability for CMMS Integration: Each unit’s unique serial number links to its factory calibration certificate, enabling direct import into computerized maintenance management systems (CMMS) for asset tracking, calibration interval management, and predictive maintenance data correlation across multiple machine trains.
• Native Compatibility with Bently Nevada System 1 Software: When connected through a 3300 XL monitor to the System 1 condition monitoring platform, the probe’s output feeds orbit plot generation, shaft centerline trend analysis, and automated alarm management — providing diagnostic transparency that supports root-cause analysis without additional signal conditioning hardware.
• IP67 Ingress Protection Reduces Maintenance Intervention: The IP67-rated probe body and mated connector withstand wash-down, lubricating oil immersion, and condensate accumulation in bearing housings, reducing the frequency of probe replacement due to moisture ingress — a common failure mode with lower-rated transducers in outdoor or wet-process installations.

Quality Assurance & Global Logistics

Each Bently Nevada 330173-00-06-10-02-00 unit dispatched from siemensplc.com undergoes a structured pre-shipment verification protocol. Inspection steps include: visual examination of the probe body, thread condition, and cable jacket for mechanical damage; dimensional check of the 10-32 UNF thread and 8mm tip geometry; cable continuity and insulation resistance measurement (IR >100 MΩ at 500 VDC); connector contact resistance verification (<5 mΩ); and confirmation of OEM part number label, date code, and serial number against the accompanying calibration documentation. Units are packed in original OEM packaging where available, or in equivalent anti-static, moisture-proof enclosures with silica gel desiccant packs to prevent corrosion during ocean or air freight transit.

Logistics operations are based in Xiamen, China — a Tier-1 export hub with direct access to DHL Express, FedEx International Priority, UPS Worldwide Express, and TNT Economy Express networks. Standard export documentation (commercial invoice, packing list, certificate of origin, and HS code 9031.80 classification) is prepared for every shipment. In-stock units ordered before 14:00 CST are eligible for same-day dispatch. Indicative transit times: 2–4 business days to Europe and North America via express courier; 4–7 business days to Southeast Asia, the Middle East, and South America. Customs clearance support, including pre-shipment HS code confirmation and shipper’s export declaration preparation, is available upon request at no additional charge.

All units are covered by a 12-month warranty from the date of shipment, applicable to manufacturing defects and calibration drift exceeding the specified ±1% full-scale accuracy band. Warranty claims are acknowledged within 48 business hours, with replacement or repair options determined following remote diagnostic review of the returned unit’s calibration data.

Contact Information

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