Bently Nevada 330905-00-10-10-02-CN Proximity Probe – 3300 NSv

330905-00-10-10-02-CN — Eddy-Current Proximity Probe in Rotating Machinery Protection Architecture

The Bently Nevada 330905-00-10-10-02-CN is a 5 mm eddy-current proximity probe belonging to the 3300 NSv (Non-Standard Voltage) series. It is designed for continuous, non-contact measurement of shaft radial displacement and vibration on rotating machinery operating in demanding industrial environments. The probe forms the field-sensing element of a three-component measurement chain — probe, extension cable, and Proximitor® sensor — and is fully compatible with Bently Nevada 3500 and 3300 rack-based machinery protection systems.

Unlike general-purpose inductive sensors, the 330905-00-10-10-02-CN is factory-calibrated against AISI 4140 steel targets and delivers a nominal scale factor of 7.87 V/mm (200 mV/mil), providing the signal linearity required for API 670-compliant machinery protection. The CN connector suffix designates a China-regional termination format, simplifying spare-parts logistics for domestic OEM machine builders and plant maintenance teams.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 330905-00-10-10-02-CN is based on the impedance change induced in a coil when a conductive target enters its electromagnetic field. The probe tip houses a precision-wound coil driven by a high-frequency oscillator within the paired Proximitor® sensor. As shaft-to-probe gap varies, eddy currents generated in the target surface alter the coil’s effective impedance; the Proximitor® demodulates this change into a DC voltage proportional to gap distance.

EMC Design: The stainless steel housing provides a Faraday-shield effect around the coil assembly, attenuating capacitively coupled interference from adjacent high-voltage cabling common in turbine control panels. The PTFE-insulated armored cable maintains signal integrity across the 1 m run to the extension cable junction, where the highest risk of ground-loop injection exists in field installations.

NSv Signal Architecture: The 3300 NSv series uses a non-standard supply voltage rail compared to the legacy 3300 XL family. This architecture allows the Proximitor® sensor to operate at a lower quiescent current, reducing self-heating in enclosed junction boxes and improving long-term zero-drift stability — a measurable advantage in continuous online monitoring applications where recalibration intervals are measured in years, not months.

5 mm Tip Geometry: The reduced tip diameter (versus the 8 mm standard) narrows the effective sensing field diameter, which decreases sensitivity to shaft surface finish irregularities and runout artifacts at the probe mounting radius. In journal bearing pedestals with limited radial clearance, the 5 mm tip can be installed without machining the bearing cap, preserving OEM structural integrity.

Integral Cable Termination: Factory-terminated cables eliminate the field-splice connector that is the single most common failure point in proximity probe installations. The armored jacket provides mechanical protection against abrasion in turbine enclosures where thermal cycling causes relative movement between cable and structure. The CN connector at the extension cable junction is rated for repeated mate/demate cycles without measurable contact resistance increase, supporting planned maintenance intervals.

System Integration Benefits

• API 670 Drop-in Compatibility: The 330905-00-10-10-02-CN meets the probe specification requirements of API 670 (5th Edition) for radial vibration and position measurement, allowing direct substitution in existing machinery protection system designs without engineering re-review.
• Deterministic Signal Latency: The eddy-current measurement chain introduces no mechanical hysteresis. Signal propagation from shaft displacement to Proximitor® output is governed by the oscillator frequency (typically 1 MHz range), yielding sub-millisecond response — essential for overspeed and high-vibration trip logic in turbine protection racks.
• Dual-Function Measurement: A single probe installation simultaneously provides radial vibration (AC component) and average shaft centerline position (DC component), eliminating the need for separate displacement transducers and reducing penetration count through bearing housing walls.
• Shaft Orbit Reconstruction: Two probes mounted 90° apart on the same bearing plane provide the X-Y displacement data required for shaft orbit plots in Bently Nevada System 1 software, enabling bearing wear trending and rotor dynamic diagnostics without additional hardware.
• Diagnostic Transparency: The Proximitor® sensor outputs a continuous DC voltage even at rest, allowing maintenance personnel to verify probe gap and cable continuity with a standard voltmeter before machine startup — a zero-cost pre-commissioning check that eliminates a common source of false trips.
• Hazardous Area Deployment: ATEX-rated configurations within the 3300 NSv family allow installation in Zone 1 and Zone 2 classified areas without additional intrinsic safety barriers, simplifying the Ex documentation package for ATEX-regulated facilities.
• Thermal Stability Across Process Extremes: The –35 °C to +177 °C operating range covers steam turbine bearing housing temperatures in both cold-climate startup conditions and high-load steady-state operation, without requiring probe removal or recalibration at seasonal temperature extremes.
• Reduced Spare-Parts Complexity: The CN connector format is standardized across the 3300 NSv probe family, meaning a single connector type covers multiple probe lengths and tip diameters — reducing the number of unique spare connector SKUs held in plant stores.
• 3500 Rack Backward Compatibility: When paired with the correct 3300 NSv Proximitor® sensor, the probe integrates with Bently Nevada 3500/40M and 3500/42M monitor cards without firmware modification, protecting existing rack infrastructure investments during plant upgrades.
• Traceable Calibration Data: Each probe ships with factory calibration documentation referencing the AISI 4140 standard target, providing the baseline data required for ISO 17025-aligned calibration management programs.

Quality Assurance & Global Logistics

Every 330905-00-10-10-02-CN unit offered through siemensplc.com is sourced through verified industrial distribution channels and handled under strict incoming inspection protocols at our Xiamen, China facility. Pre-shipment checks include visual inspection of the probe tip and connector, cable continuity verification, and confirmation of original manufacturer packaging integrity.

Units are stored in ESD-safe, climate-controlled warehousing to prevent moisture ingress into the cable assembly — a known degradation mechanism for PTFE-insulated proximity probe cables in humid storage environments. Batch traceability documentation is available upon request for customers operating under ISO 9001 or IATF 16949 quality management systems.

Shipments from Xiamen reach major industrial hubs via DHL Express, FedEx International Priority, and SF International, with typical transit times of 3–5 business days to Southeast Asia, 5–7 days to Europe, and 5–8 days to North America. Export documentation including commercial invoice, packing list, and HS code declaration (HS 9031.80) is prepared for each shipment. For project orders requiring consolidated freight or third-party inspection, contact our logistics team before order placement.

All products carry a 12-month warranty from the date of shipment, covering manufacturing defects under normal operating conditions. Warranty claims are processed with replacement unit dispatch within 5 business days of defect confirmation.

Contact Information

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