Bently Nevada 330876-02-10-00-00 Proximity Probe – 3300 XL Series

Bently Nevada 330876-02-10-00-00 — 8 mm Eddy-Current Proximity Probe for Continuous Shaft Displacement Monitoring

The Bently Nevada 330876-02-10-00-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. Within a rotating-machinery protection loop, this probe functions as the primary sensing element responsible for converting mechanical shaft displacement into a proportional DC voltage signal. Its output feeds directly into a Proximitor sensor — typically the 330180 Series — which conditions the raw impedance change into a calibrated ±24 VDC signal chain compatible with Bently Nevada 3500 and 3300 monitoring racks.

The probe operates on the eddy-current (inductive) principle: a high-frequency oscillator (nominally 1.0 MHz) drives a coil wound inside the probe tip. When a conductive target surface enters the electromagnetic field, eddy currents are induced on the target, loading the oscillator circuit and reducing coil impedance. The Proximitor converts this impedance change into a linear voltage output across the calibrated gap range of 0.25 mm to 2.25 mm. The 330876-02-10-00-00 variant ships with a 2.0 m integral cable, eliminating one field-wiring junction and reducing signal path resistance — a measurable factor in installations where cable runs approach the system’s maximum allowable loop resistance.

In turbomachinery protection architectures governed by API 670 (5th Edition), this probe is deployed in radial vibration measurement planes, typically installed at 90° X–Y orientation around the bearing journal. The 8 mm tip diameter provides a linear measurement range adequate for most industrial shaft diameters from 25 mm upward, with sensitivity traceable to the OEM-specified 7.87 V/mm (200 mV/mil) at the calibrated gap midpoint of 1.27 mm.

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Technical Parameters

Hardware Logical Analysis

The 330876-02-10-00-00 embodies several hardware design decisions that distinguish it from generic eddy-current sensors in the industrial market.

Coil Geometry and Field Uniformity. The 8 mm tip diameter is not arbitrary — it defines the electromagnetic field diameter and, consequently, the minimum target surface area required for a valid measurement. Bently Nevada’s coil winding geometry is optimized to produce a field that remains orthogonal to the target surface across the full 2.0 mm linear range, suppressing cosine-error artifacts that appear in probes with non-planar field distributions. This is particularly relevant in applications where shaft runout causes the probe-to-shaft angle to vary dynamically.

EMC Design and Shielding Architecture. The integral cable uses a triaxial construction: the center conductor carries the oscillator signal, the inner shield is driven at the same potential as the center conductor (guard drive), and the outer shield is grounded. This guard-drive topology eliminates capacitive leakage between the signal conductor and ground across the cable length, maintaining measurement accuracy even when the 2.0 m cable is routed through conduit shared with power wiring. The result is a cable-induced phase error below 0.5° at 1.0 MHz — a specification that generic coaxial cables cannot meet.

Thermal Stability and Compensation. The probe’s ferrite core and coil assembly are selected for low temperature coefficient of inductance (TCI). Over the operating range of −35 °C to +177 °C, the scale factor drift is maintained within ±1% of the nominal 7.87 V/mm. This is achieved through matched-material construction: the housing, coil former, and potting compound are selected to have compatible thermal expansion coefficients, preventing mechanical stress on the coil geometry at temperature extremes.

Integral Cable Advantage. The 330876-02-10-00-00 variant’s 2.0 m integral cable eliminates the field-installed connector junction between probe and extension cable. Each connector junction introduces a potential impedance discontinuity and a corrosion failure point. In high-humidity or H₂S-bearing environments (common in petrochemical plants), connector corrosion is a documented failure mode. The integral design reduces this risk by removing one junction from the signal path entirely.

Stainless Steel Housing and Chemical Resistance. The 316 stainless steel housing provides resistance to chloride-induced pitting corrosion — a requirement in offshore and coastal installations where salt-laden air contacts probe bodies. The IP67 rating confirms the probe body withstands temporary immersion, relevant during turbine washing cycles where water ingress into the bearing housing is possible.

System Integration Benefits

• Direct API 670 Compliance: The probe meets API 670 5th Edition transducer requirements without additional field calibration, allowing immediate integration into new or replacement machinery protection systems with documented traceability.
• Deterministic Signal Latency: The eddy-current sensing principle produces a continuous analog output with no sampling delay. Combined with the 3500 monitor rack’s 20 ms alarm response time, the system achieves deterministic protection response — critical for high-speed turbomachinery where shaft excursions can reach dangerous amplitudes within 50–100 ms.
• Drop-in Replacement Compatibility: The 330876-02-10-00-00 is dimensionally and electrically identical to previous 3300 XL 8 mm probe variants. No Proximitor recalibration is required when replacing a failed probe of the same series, reducing planned maintenance downtime to the physical swap time only.
• Diagnostic Transparency via DC Gap Voltage: The probe’s DC output voltage at the Proximitor terminal provides a continuous, real-time indication of the average probe-to-shaft gap. Operators can trend this value over time to detect bearing wear (decreasing gap) or shaft bow (oscillating gap offset), enabling condition-based maintenance decisions without additional instrumentation.
• Dual-Plane X–Y Vibration Resolution: When installed in orthogonal pairs, two 330876-02-10-00-00 probes provide the vector data required to plot shaft orbit — the Lissajous figure of shaft centerline motion. Orbit analysis distinguishes between unbalance, misalignment, oil whirl, and rub conditions, each of which produces a characteristic orbit shape that scalar vibration amplitude alone cannot differentiate.
• Compatibility with 3500 Rack Diagnostics: The 3500 monitor rack performs continuous self-diagnostics on the transducer loop, including gap voltage out-of-range detection, open-circuit and short-circuit alarms, and not-OK relay actuation. The 330876-02-10-00-00’s calibrated impedance characteristics ensure these diagnostic thresholds function as designed without false trips.
• Low Maintenance Burden: Non-contact sensing eliminates mechanical wear. The probe has no moving parts, no consumable elements, and no lubrication requirements. Mean time between failures (MTBF) for installed 3300 XL probes in clean industrial environments exceeds 100,000 hours under normal operating conditions.
• Scalable to Redundant Architectures: In 2oo3 (two-out-of-three) voting protection systems, three probes per measurement plane are installed. The 330876-02-10-00-00’s consistent scale factor across units — held to ±1% at factory calibration — ensures that the voting logic operates on signals with matched sensitivity, preventing systematic bias in the majority-vote output.

Quality Assurance & Global Logistics

Every Bently Nevada 330876-02-10-00-00 unit supplied by siemensplc.com is sourced from verified distribution channels carrying original manufacturer documentation. Units are not remanufactured, relabeled, or modified. Serial numbers are recorded at intake and cross-referenced against shipment documentation to confirm provenance.

Pre-shipment inspection covers physical integrity of the probe housing, cable jacket, and connector; verification of the part number label and date code; and dimensional check of the tip geometry. Where bench test equipment is available, sensitivity is spot-checked against a calibrated AISI 4140 target at the nominal 1.27 mm gap to confirm output within ±2% of 7.87 V/mm before dispatch.

Shipments originate from Xiamen, China — a major southeastern port city with direct access to DHL Express, FedEx International Priority, and UPS Worldwide networks. Standard export lead time for in-stock units is 1–2 business days from order confirmation. Expedited same-day dispatch is available for orders confirmed before 14:00 CST. Bulk orders (5+ units) qualify for sea freight consolidation with competitive freight rates to European, Middle Eastern, and Southeast Asian destinations.

Export documentation includes commercial invoice, packing list with individual serial numbers, and certificate of origin. HS Code 9031.80 applies to this product class. No ITAR or EAR export restrictions apply. A 12-month warranty against manufacturing defects is provided from the date of shipment, with warranty claims processed via return merchandise authorization (RMA) issued within 48 hours of claim submission.

Contact Information

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