Bently Nevada 330905-00-16-10-02-00 Proximity Probe – 3300 NSv Series

Bently Nevada 330905-00-16-10-02-00 — Eddy-Current Proximity Probe in the 3300 NSv Transducer System

The 330905-00-16-10-02-00 is a factory-new, 8 mm eddy-current proximity probe manufactured by Bently Nevada (a Baker Hughes business) within the 3300 NSv Proximity Transducer System platform. Its primary function in a rotating-machinery protection loop is to convert the physical air gap between the probe tip and a conductive target shaft into a proportional DC voltage signal — without any mechanical contact, without wear, and without signal drift attributable to friction or hysteresis. The probe operates as the field-sensing element of a three-component measurement chain: probe → extension cable → driver/oscillator. Each component is factory-matched to maintain the 7.87 V/mm (200 mV/mil) sensitivity specification across the full measurement range.

In a typical API 670 machinery protection architecture, this probe is mounted radially in a bearing pedestal bracket at 90° X/Y orientation to capture shaft orbital motion. The DC output feeds directly into a Bently Nevada 3500-series monitor card — such as the 3500/40M or 3500/42M — where gap voltage is converted to displacement in µm or mil, compared against alarm and danger setpoints, and logged for trend analysis. The 330905-00-16-10-02-00 is also used in axial thrust position measurement when mounted against a thrust collar, and in eccentricity measurement during slow-roll runout acquisition at startup.

The part number structure encodes the probe’s physical configuration: position 3 (“16”) specifies a 16-inch (406 mm) probe body length, position 4 (“10”) specifies the armored cable jacket type, and positions 5–6 (“02-00”) define the connector and termination style. This configuration is the most widely specified variant for steam turbine and centrifugal compressor applications where the bearing pedestal depth requires a longer probe body to reach the shaft surface from the bracket mounting face.

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Technical Parameters

Hardware Logical Analysis

The 330905-00-16-10-02-00 operates on the principle of electromagnetic induction at radio frequency. The probe tip contains a flat coil wound on a ferrite core. The driver/oscillator energizes this coil at approximately 1 MHz, generating an alternating magnetic field that extends axially from the tip face. When a conductive target enters this field, eddy currents are induced on the target surface, loading the coil and reducing its effective inductance and Q-factor. The driver circuit — a Colpitts-type oscillator with a demodulation stage — converts this impedance change into a DC output voltage that is linear with gap distance across the 0–2.0 mm measurement range.

EMC Design: The armored cable jacket on the 330905-00-16-10-02-00 serves a dual function: mechanical protection against abrasion in bearing pedestals, and RF shielding of the coaxial signal path. The shield is grounded at the driver end only (single-point grounding) to prevent ground-loop currents from injecting common-mode noise into the measurement signal. In high-EMI environments — such as variable-frequency drive (VFD) motor rooms or switchgear-adjacent installations — this single-point shield topology maintains signal integrity without requiring additional ferrite chokes or isolation transformers.

Thermal Stability: The probe body is rated to +177 °C, which covers the bearing pedestal temperatures encountered in most steam turbine hot-section applications. The ferrite core material is selected for low temperature coefficient of permeability, keeping sensitivity drift below 0.05% per °C across the operating range. This is critical in applications where the probe gap is used to calculate absolute shaft position (thrust measurement) rather than relative vibration — any sensitivity drift would translate directly into a position measurement error.

Mechanical Mounting Tolerance: The 16-inch body length of this variant is specified for installations where the bearing pedestal bracket face is set back from the shaft centerline by more than 300 mm. The extended body allows the probe tip to reach the shaft surface while the connector end remains accessible for cable routing and maintenance. The probe body threads are M10×1.0 (standard NSv), compatible with all Bently Nevada bracket assemblies and third-party API 670 mounting hardware machined to the same thread specification.

System Integration Benefits

• Zero-recalibration replacement: The 330905-00-16-10-02-00 is factory-calibrated to the 3300 NSv system sensitivity standard. Replacing a failed probe of the same part number requires no monitor recalibration — the new probe’s sensitivity is within the monitor’s accepted tolerance band by design.
• Deterministic signal latency: The eddy-current measurement chain introduces no sampling delay beyond the driver’s demodulation filter time constant (typically <1 ms). This ensures that the monitor receives a real-time gap signal with deterministic latency, which is essential for machinery protection systems where trip response time is specified in milliseconds.
• Diagnostic transparency via gap DC level: The DC output voltage at the monitor input provides a continuous, readable indication of the static probe gap. Technicians can verify correct installation gap (typically 1.0 mm / −10.0 VDC for 3300 NSv) with a standard multimeter at the driver output terminals, without requiring a laptop or configuration tool.
• API 670 system compliance: Using a factory-matched 330905-00-16-10-02-00 within a 3300 NSv system maintains the complete transducer system’s API 670 compliance. Substituting non-matched probes can invalidate the system’s sensitivity specification and the associated machinery protection setpoints.
• Broad monitor compatibility: The probe is electrically compatible with the full 3500-series monitor card range — 3500/40M (radial vibration), 3500/42M (proximitor/seismic), 3500/45 (position), and 3500/46M (hydro) — without any hardware modification or jumper change at the monitor card.
• Reduced installation downtime: The MIL-spec connector mates and locks in a single quarter-turn motion. Combined with the standard M10×1.0 probe body thread, a trained technician can complete a probe replacement — including gap setting and signal verification — within 30 minutes on a prepared bracket.
• Long-term data continuity: Because the replacement probe’s sensitivity matches the original within ±1%, historical vibration trend data recorded before the replacement remains directly comparable to post-replacement data. There is no step-change in the recorded signal that would require a trend baseline reset in the condition monitoring database.
• Hazardous area suitability: The 3300 NSv system carries ATEX certification at the system level. Using a genuine 330905-00-16-10-02-00 as the probe component preserves the system’s ATEX classification. This is a compliance requirement in petrochemical and offshore installations where the probe is located in a classified zone.

Quality Assurance & Global Logistics

Every 330905-00-16-10-02-00 unit supplied by siemensplc.com is sourced through verified Bently Nevada / Baker Hughes authorized distribution channels or documented OEM-surplus inventory with full chain-of-custody records. Units are not modified, relabeled, or remanufactured. The original Bently Nevada factory label — carrying the part number, serial number, and date code — is present on every unit shipped.

Pre-shipment verification covers four checkpoints: (1) physical inspection of the probe tip, cable jacket, connector pins, and factory label against Bently Nevada reference standards; (2) gap-vs-voltage linearity bench test using a calibrated AISI 4140 target disc and reference oscillator, confirming output sensitivity within ±1% of 7.87 V/mm; (3) packaging integrity check confirming original Bently Nevada packaging and holographic seal; (4) documentation review confirming factory test certificate availability for the specific serial number.

Stock is held in Xiamen, China. Orders confirmed before 14:00 CST are dispatched same day. International express shipment is via DHL Express, FedEx International Priority, or UPS Worldwide — typical transit time is 2–5 business days to most destinations in Asia, Europe, the Middle East, and the Americas. Export documentation — commercial invoice, packing list, certificate of origin, and MSDS — is prepared for every shipment. Preferred Incoterms: EXW Xiamen, FOB Xiamen, or CIF destination. Volume pricing is available for orders of 5 units or more. A 12-month warranty covers manufacturing defects from the date of shipment; units that fail incoming inspection at the customer’s facility may be returned within 7 days of receipt for replacement or full refund.

Contact Information

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