Bently Nevada 330904-00-14-10-02-05/CN Proximity Probe – 3300 NSv

Bently Nevada 330904-00-14-10-02-05/CN — 14 mm Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330904-00-14-10-02-05/CN is a factory-original eddy-current proximity probe belonging to the 3300 NSv Series — a platform engineered specifically for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion on turbines, compressors, and large rotating machinery. This particular variant features a 14 mm probe tip diameter, a 1.0 m integral probe cable, and is configured for a total system cable length of 5 m when paired with the appropriate 330130-series extension cable. The /CN suffix designates the connector style and regional compliance variant.

In a machinery protection architecture governed by API 670 (5th Edition), the proximity probe is the primary sensing element in the measurement chain. Its output — a DC-biased, AC-modulated voltage proportional to the gap between the probe tip and the conductive target shaft — feeds directly into the Proximitor sensor (driver), which conditions the signal before transmission to the 3500-series monitor rack. The integrity of this measurement chain determines whether a protection system can reliably discriminate between normal operational vibration and a developing fault condition such as oil whirl, rub, or bearing degradation. Selecting a probe with verified sensitivity tolerance and stable thermal characteristics is therefore not a procurement preference — it is a system safety requirement.

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Technical Parameters

Hardware Logical Analysis

The 330904-00-14-10-02-05/CN operates on the principle of high-frequency eddy-current induction. The probe tip houses a wound coil driven by an oscillator circuit within the paired Proximitor sensor at approximately 1.0 MHz. When the conductive shaft surface enters the probe’s electromagnetic field, eddy currents are induced in the target, loading the oscillator and producing a measurable change in coil impedance. This impedance shift is demodulated into a linear DC voltage output proportional to the probe-to-shaft gap.

EMC Design: The coaxial cable construction — with the signal conductor surrounded by a continuous braided shield — provides inherent rejection of common-mode electromagnetic interference. In industrial environments where variable-frequency drives, high-current bus bars, and switching power supplies generate broadband EMI, this shielded architecture maintains signal integrity without requiring additional filtering at the monitor input. The shield is grounded at the Proximitor end only, preventing ground-loop currents that would otherwise introduce low-frequency noise into the measurement.

Thermal Stability: The 3300 NSv probe body is constructed from 316 stainless steel with a PTFE-jacketed cable, providing chemical resistance and dimensional stability across the full −35 °C to +177 °C operating envelope. The coil winding uses a thermally compensated formulation that maintains sensitivity within ±1% across the rated temperature range — a critical parameter for axial position measurements where thermal growth of the shaft must be distinguished from actual displacement.

Mechanical Integration: The 14 mm tip diameter is the standard size specified in API 670 for radial vibration probes on machines with shaft diameters above approximately 75 mm. The reverse-mount connector orientation of the /CN variant allows installation in confined bearing housing geometries where a forward-exit cable would conflict with adjacent pipework or structural members. The probe body thread (M14 × 1.5 or 1/2-20 UNF depending on bracket specification) engages standard API 670 probe holders without modification.

System Integration Benefits

• Direct compatibility with 3500-series monitor racks: The 330904 probe is factory-calibrated to the 3300 NSv Proximitor sensor (e.g., 330180-91-00), ensuring the complete measurement chain meets the ±1% full-scale accuracy specification required for API 670 alarm and trip setpoint validation.
• Deterministic signal latency: The analog output architecture eliminates digitization latency at the probe level. The monitor rack samples the conditioned voltage at its own deterministic scan rate (typically 10 kHz per channel on 3500/40M), preserving the temporal resolution needed to detect sub-synchronous instabilities such as oil whirl at frequencies below running speed.
• Plug-and-play replacement without recalibration: Because the 330904 is manufactured to a defined sensitivity tolerance (7.87 V/mm ± 5%), a replacement probe can be installed without re-entering calibration constants in the monitor — reducing mean time to repair (MTTR) during planned or forced outages.
• Hazardous area deployment: With ATEX / IECEx certification (zone classification per datasheet), the probe can be installed in gas-turbine enclosures and other classified areas when used with the appropriate 3300 RAM safety barrier, without requiring additional intrinsic safety isolators in the signal path.
• Diagnostic transparency via gap voltage monitoring: The DC bias voltage at mid-gap (nominally −10 VDC) is continuously available at the Proximitor output. Monitor channels configured to alarm on gap voltage deviation provide early warning of probe fouling, cable damage, or mechanical contact — faults that would otherwise be invisible until a vibration alarm occurs.
• Reduced wiring complexity: The 5 m total cable system (1 m probe + 4 m extension) covers the majority of standard bearing-housing-to-junction-box distances in turbomachinery installations, eliminating the need for intermediate splices that introduce impedance discontinuities and potential moisture ingress points.
• Long-term spare parts availability: The 3300 NSv series remains the active standard for Bently Nevada machinery protection systems. Stocking the 330904-00-14-10-02-05/CN as a critical spare ensures availability for emergency replacement without dependency on lead times from the OEM distribution network.
• Cross-platform monitor compatibility: While optimized for the 3500-series, the probe’s output characteristics are compatible with third-party monitors that accept standard eddy-current probe inputs (−24 VDC supply, 200 mV/mil sensitivity), providing flexibility in hybrid protection system architectures.

Quality Assurance & Global Logistics

Every Bently Nevada 330904-00-14-10-02-05/CN unit dispatched from our Xiamen, China facility is sourced through verified supply channels and undergoes a structured pre-shipment inspection: physical label and serial number authentication against factory reference data, connector and cable jacket integrity check, and output sensitivity verification using calibrated bench equipment traceable to national standards. Units that do not meet factory tolerance specifications are quarantined and not offered for sale.

Packaging follows anti-static and moisture-barrier protocols. Each shipment includes a packing list, commercial invoice with HS code 9031.80 declaration, and a 12-month warranty certificate. For customers requiring a Certificate of Conformance or original manufacturer documentation, these are provided where available from our supply chain records.

Logistics from Xiamen operate via DHL Express, FedEx International Priority, and UPS Worldwide Express. In-stock units are dispatched within 1 business day of payment confirmation. Transit times to major industrial hubs: Southeast Asia 2–3 days, Europe 3–5 days, North America 4–6 days, Middle East 3–5 days. Expedited same-day dispatch is available for plant shutdown emergencies — contact us directly via WhatsApp for urgent coordination.

Contact Information

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