Bently Nevada 330102-00-28-10-02-05 Proximity Probe – 3300 XL Series

Bently Nevada 330102-00-28-10-02-05 — 8 mm Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330102-00-28-10-02-05 is a factory-calibrated, 8 mm diameter eddy-current proximity probe belonging to the 3300 XL Series — the platform that defines the API 670 machinery protection standard in rotating equipment industries worldwide. This probe functions as the primary sensing element in a three-component measurement loop (probe → extension cable → Proximitor® driver), converting rotor-to-probe gap distance into a proportional DC voltage signal with a nominal scale factor of 7.87 V/mm (200 mV/mil). The output is consumed directly by 3500 Series monitors for real-time shaft radial vibration, axial position, and differential expansion measurement.

Unlike general-purpose inductive sensors, the 330102-00-28-10-02-05 is engineered specifically for the mechanical and electromagnetic environment of high-speed rotating machinery. Its integral coaxial cable construction eliminates field-assembled connectors — statistically the highest-failure-rate component in proximity measurement loops — and its hermetically sealed tip assembly maintains calibration integrity at continuous operating temperatures up to 177 °C (350 °F), covering the thermal envelope of most steam turbine bearing housings without auxiliary cooling.

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Technical Parameters

Hardware Logical Analysis

The 330102-00-28-10-02-05 operates on the eddy-current (electromagnetic induction) principle. The probe tip houses a flat coil wound on a ferrite core, driven by a high-frequency oscillator (typically 1.0 MHz) embedded in the paired Proximitor® driver. When the conductive target (rotor shaft) enters the probe’s electromagnetic field, eddy currents are induced on the shaft surface, loading the oscillator circuit and reducing its output amplitude. The Proximitor® demodulates this amplitude change into a DC voltage proportional to the air gap — a fundamentally passive, contact-free measurement with no mechanical wear mechanism.

EMC Design: The coaxial cable geometry provides inherent common-mode noise rejection. The shield is grounded at the Proximitor® end only (single-point grounding), preventing ground-loop currents that would appear as low-frequency noise on the output signal. The probe body’s 316 SS housing acts as a Faraday shield against radiated RF interference from variable-frequency drives and high-voltage switchgear commonly co-located in turbine halls.

Thermal Stability: The ferrite core material is selected for low temperature coefficient of permeability across the –35 °C to +177 °C range. Scale factor drift is specified at less than ±0.5% over the full thermal envelope, which translates to a gap measurement error of less than ±12.7 µm at full-scale — well within the ±25 µm alarm setpoint resolution required by API 670 for radial vibration channels.

Integral Cable Advantage: The 1.0 m integral cable is factory-matched to the probe coil and Proximitor® driver as a calibrated system. Field-assembled connectors introduce impedance discontinuities that shift the effective scale factor by 1–3%, requiring field recalibration. The integral design eliminates this variable entirely, preserving factory calibration accuracy from installation through the service life of the probe.

Target Material Sensitivity: Eddy-current depth of penetration (skin depth) is a function of target conductivity and permeability. For non-standard target materials (e.g., 316 SS, Inconel 718, titanium alloys), a correction factor must be applied to the nominal 7.87 V/mm scale factor. Bently Nevada publishes material correction curves in document 141536-01; the 330102-00-28-10-02-05 is compatible with this correction methodology without hardware modification.

System Integration Benefits

• API 670 Compliance Out of the Box: The probe meets all dimensional, electrical, and performance requirements of API 670 (5th Edition) for radial vibration and axial position channels, eliminating the need for project-specific deviation documentation during HAZOP and SIL reviews.
• Backward Compatibility with 3300 Series: The 3300 XL probe is electrically and mechanically interchangeable with the legacy 3300 Series, allowing direct replacement in existing installations without rewiring, reconfiguration of the Proximitor® driver, or monitor recalibration — critical for minimizing planned outage duration.
• DC-to-10 kHz Flat Response: The –3 dB bandwidth of 10 kHz captures shaft dynamic events from slow-roll runout (sub-1 Hz) through high-order gear-mesh harmonics and blade-pass frequencies in a single measurement channel, eliminating the need for parallel sensor architectures on most machinery trains.
• Deterministic Output Latency: The eddy-current measurement chain introduces no digital processing latency. The Proximitor® output is an analog DC signal available within microseconds of gap change, enabling the 3500 monitor to execute protection trips within its specified 20 ms response time — a requirement for overspeed and high-vibration protection on steam turbines.
• Diagnostic Transparency via Gap Voltage: The DC component of the Proximitor® output provides a continuous, real-time indication of probe-to-shaft gap. Operators can verify probe installation gap (target: –10.0 VDC / 1.27 mm) and detect probe fouling, shaft bow, or mounting bracket looseness without removing the probe from service.
• Hazardous Area Deployment: ATEX and IECEx certification (Zone 1, Group IIC) allows installation in the bearing housings of gas turbines and compressors operating in classified areas without additional intrinsic safety barriers, simplifying the loop BOM and reducing installed cost.
• Scalable Redundancy Architecture: Two 330102-00-28-10-02-05 probes mounted at 90° (X–Y configuration) per bearing journal provide full orbit analysis capability. The 3500/42M monitor accepts both channels simultaneously, computing shaft centerline position and orbit shape for advanced diagnostic trending without additional hardware.
• Long-Term Calibration Stability: The absence of moving parts, fluid-filled chambers, or consumable elements means the probe’s scale factor remains within specification for the full machinery overhaul interval (typically 4–8 years for gas turbines), reducing calibration maintenance costs compared to piezoelectric or velocity-type sensors.

Quality Assurance & Global Logistics

Every Bently Nevada 330102-00-28-10-02-05 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification protocol:

• Dimensional Verification: Probe tip diameter, thread pitch (M10×1.0 standard), and cable length are measured against OEM engineering drawings.
• Electrical Continuity: Center conductor and shield continuity are verified; insulation resistance between conductor and shield is tested at 500 VDC (minimum 100 MΩ).
• Scale Factor Check: Gap voltage output is verified at three reference gaps (0.5 mm, 1.27 mm, 2.0 mm) using a calibrated non-ferrous gap-setting fixture. Results are logged against the unit serial number.
• Authenticity Screening: Label typography, connector geometry, and cable jacket markings are cross-referenced against current OEM production standards. Lots from unverified channels are quarantined pending traceability documentation review.
• Packaging: Units are individually sealed in anti-static polyethylene bags with silica gel desiccant, placed in foam-lined cartons rated for ISTA 2A transit testing.

Logistics from Xiamen covers all major global destinations: DHL Express (1–3 business days to Europe/North America), FedEx International Priority, and sea freight for bulk orders. Export documentation — including commercial invoice, packing list, certificate of origin, and ECCN classification — is prepared in-house. Typical in-stock order processing time is same business day for orders placed before 15:00 CST.

Contact Information

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