Bently Nevada 330106-05-30-90-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330106-05-30-90-02-05 — 5 mm Eddy-Current Proximity Probe for Turbomachinery Protection Systems

The Bently Nevada 330106-05-30-90-02-05 is a 5 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. Within a machinery protection loop, this probe functions as the primary sensing element: it generates a high-frequency oscillating electromagnetic field at its tip, and any conductive target entering that field induces eddy currents that attenuate the oscillation amplitude. The driver/conditioner downstream converts this attenuation into a calibrated DC voltage output — nominally 200 mV/mil (7.87 V/mm) — which the monitor interprets as a displacement measurement with sub-micron resolution.

The -05-30-90-02-05 suffix encodes the probe’s physical configuration: 5 mm tip diameter, 30-inch integral armored cable, 90° angled connector body, metric M10 × 1 thread, and standard sensitivity range. This configuration is selected for installations where radial access is constrained — the 90° connector routes the cable parallel to the shaft centerline, reducing the minimum clearance envelope required at the probe mounting boss.

In a complete 3300 XL transducer chain, this probe pairs with a 330130-series extension cable and a 3300 XL NSv Proximitor® Sensor (330180-X1-05). The total system cable length — integral plus extension — must match the driver’s factory-calibrated range. Substituting extension cables of incorrect characteristic impedance or capacitance per unit length will shift the linear range and introduce a static gap error that cannot be corrected by monitor scaling alone.

Applications span the full spectrum of rotating machinery: radial shaft vibration per API 670, axial thrust position, differential expansion on large steam turbines, eccentricity monitoring during slow-roll, and keyphasor phase reference. The probe’s 0–10,000 Hz frequency response covers all sub-synchronous, synchronous, and harmonic components relevant to machinery diagnostics up to 600,000 RPM equivalent shaft speed.

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Technical Parameters

Hardware Logical Analysis

The 330106-05-30-90-02-05 probe coil is wound on a ferrite core and encapsulated in a thermally stable epoxy compound within the 316 SS housing. The coil geometry is precision-controlled to maintain a consistent field depth-to-diameter ratio, which directly governs the slope of the sensitivity curve across the linear range. Deviation in coil geometry — even at the sub-millimeter level — produces a non-linear sensitivity error that manifests as a false DC offset at the monitor input.

The 30-inch armored integral cable uses a coaxial construction with a defined capacitance per unit length (typically 28–32 pF/ft). This capacitance, combined with the driver’s internal oscillator frequency (nominally 1 MHz for 5 mm probes), determines the resonant tuning of the transducer circuit. The 90° connector body incorporates a hermetically sealed interface that maintains the cable’s characteristic impedance through the bend radius, preventing reflections that would appear as noise on the output signal.

EMC Design: The armored cable braid provides a continuous Faraday shield from probe tip to driver input, attenuating radiated interference from adjacent VFDs, bus bars, and high-voltage switchgear. The shield is grounded at the driver end only (single-point grounding) to prevent ground loop currents from superimposing 50/60 Hz noise on the displacement signal. In installations with severe conducted EMI, the 3300 XL system’s differential input architecture at the driver stage provides an additional 40 dB common-mode rejection ratio (CMRR).

Thermal Stability: The epoxy encapsulant has a coefficient of thermal expansion (CTE) matched to the ferrite core material, limiting sensitivity drift to less than ±0.5% across the full −35°C to +177°C operating range. This is critical in steam turbine applications where probe body temperatures can cycle between ambient and 150°C+ during start-stop sequences.

Mechanical Robustness: The M10 × 1 thread and locknut arrangement provides a defined torque-to-preload relationship, preventing probe migration under vibration. The 316 SS housing resists corrosion from condensate, lube oil, and process gas atmospheres encountered in petrochemical and power generation environments.

System Integration Benefits

• API 670 Compliance Out-of-Box: The 330106-05-30-90-02-05 meets API 670 5th Edition requirements for radial vibration and axial position transducers without additional field calibration, provided the matched extension cable and driver are used.
• Deterministic Real-Time Response: The eddy-current measurement principle is inherently passive at the probe — no active electronics in the sensing element — eliminating firmware latency. The driver output updates continuously at the oscillator frequency, giving the monitor a true analog signal with no sampling jitter.
• Diagnostic Transparency: The DC gap voltage output provides a direct, unambiguous indication of probe-to-shaft clearance. Technicians can verify probe installation gap with a standard voltmeter without powering up the full monitor system.
• Non-Contact Measurement: Zero mechanical wear on the sensing element over the service life of the machine. Unlike contact-type sensors, there is no tribological degradation that would shift the calibration baseline over time.
• Wide Frequency Bandwidth: The 0–10,000 Hz flat response captures all relevant vibration orders for machines operating up to 600,000 CPM, including sub-synchronous instabilities (oil whirl, surge) and high-order blade-pass frequencies.
• Hazardous Area Certification: ATEX and FM dual certification allows deployment in Zone 1/Class I Div 1 environments without additional barriers when used with the certified 3300 XL driver, reducing BOM complexity in offshore and refinery installations.
• Matched System Calibration: Factory calibration as a probe-cable-driver set ensures ±1% sensitivity accuracy across the linear range. This eliminates the field calibration step that would otherwise require a precision gap-setting fixture and reference voltmeter.
• Backward Compatibility with 3500 MPS: The analog output of the 3300 XL driver is fully compatible with the Bently Nevada 3500 Series Machinery Protection System input cards, protecting existing monitor infrastructure investments when replacing probes on legacy installations.
• Compact 5 mm Tip for Tight Installations: The 5 mm tip diameter requires a smaller shaft target area than 8 mm probes, enabling installation on smaller shaft diameters (minimum ~25 mm) and in confined bearing housings where 8 mm probes cannot be accommodated.
• 90° Connector for Radial Cable Routing: The angled connector body reduces the axial protrusion of the cable exit, allowing the probe to be installed in bearing housings with limited axial clearance without bending the integral cable beyond its minimum bend radius.

Quality Assurance & Global Logistics

Every Bently Nevada 330106-05-30-90-02-05 unit supplied by siemensplc.com is sourced through verified industrial supply channels with full documentation traceability. Prior to dispatch from our Xiamen, China facility, each probe undergoes a physical integrity inspection covering housing condition, connector pin alignment, cable armor continuity, and label legibility. Units are shipped in original OEM packaging where available, with anti-static inner wrap and rigid outer carton to prevent transit damage.

A Certificate of Conformance (CoC) is available upon request for each shipment, confirming part number, quantity, and supply chain origin. For projects requiring API 670 documentation packages, we can provide manufacturer test reports and material certifications on request.

Shipping from Xiamen, China: We dispatch via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard transit times are 3–5 business days to Europe and North America, 2–4 days to Southeast Asia and the Middle East. Sea freight consolidation is available for bulk orders. Export documentation — commercial invoice, packing list, and HS code declaration — is prepared in compliance with Chinese customs regulations and destination country import requirements.

Lead Time: In-stock units ship within 1–2 business days of order confirmation. For sourced orders, typical lead time is 2–4 weeks. Contact us for current stock status before placing time-critical orders.

Warranty: 12-month warranty against manufacturing defects from date of shipment. Warranty claims are processed with return material authorization (RMA); replacement units are dispatched 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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