Bently Nevada 330905-00-14-10-02-CN Proximity Probe – 3300 NSv Series

Bently Nevada 330905-00-14-10-02-CN: 8mm Eddy Current Proximity Probe in the 3300 NSv Measurement Chain

The 330905-00-14-10-02-CN is an 8mm eddy current proximity probe manufactured by Bently Nevada, configured for the 3300 NSv (Non-Standard Voltage) platform. It functions as the primary transduction element in a three-component measurement chain — probe, extension cable, and Proximitor — used to deliver continuous, non-contact shaft displacement and vibration data to machinery protection and condition monitoring systems. This specific configuration carries a 1.4 m integral armored probe cable and a 1.0 m extension cable (suffix -02), with the -CN designation indicating a China-market variant with localized documentation and cable termination standards.

In rotating machinery protection, the proximity probe is the first link in the signal chain. Its physical gap to the shaft surface is transduced into a DC voltage by the Proximitor, which then feeds the monitor rack. Any degradation in probe linearity, housing integrity, or cable impedance directly corrupts the vibration amplitude and phase data used by the protection system to make trip decisions. The 330905-00-14-10-02-CN is factory-calibrated as a matched set with its extension cable and Proximitor, ensuring the scale factor of 7.87 V/mm (200 mV/mil) is maintained across the full linear range of 0.25 mm to 2.54 mm without field adjustment.

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Technical Parameters

Hardware Logical Analysis

The eddy current sensing principle relies on the interaction between a high-frequency oscillator field (typically 1–2 MHz) generated at the probe tip coil and the conductive target surface. As the gap between probe tip and shaft changes, the eddy current losses in the target alter the oscillator’s impedance, which the Proximitor demodulates into a proportional DC voltage. The 330905-00-14-10-02-CN is wound and potted to maintain coil inductance stability across its rated temperature range of –40 °C to +177 °C — a critical parameter in turbine bearing housings where thermal gradients between cold start and full-load operation can exceed 150 °C within a single shift.

The NSv (Non-Standard Voltage) designation distinguishes this probe from the standard Sv variant. The NSv architecture extends the output voltage swing to –1 VDC to –21 VDC, compared to the Sv range of –2 VDC to –18 VDC. This wider dynamic range is specifically engineered for large-gap applications — such as axial position measurement on thrust bearings with high float — where the standard voltage range would clip at maximum displacement. The NSv Proximitor provides the matched excitation and demodulation circuitry; mixing NSv probes with Sv Proximitors produces a systematic scale factor error that cannot be corrected in the monitor configuration and will result in non-compliant API 670 channel performance.

The 316 stainless steel housing provides resistance to chloride-induced pitting and hydrogen sulfide stress corrosion cracking, both of which are present in refinery and gas processing environments. The armored coaxial cable uses a stainless steel braid over a PTFE-insulated center conductor, maintaining characteristic impedance within ±2% across the rated temperature range. Impedance deviation in the cable directly shifts the Proximitor’s demodulation reference and introduces a static offset error in the gap measurement — a failure mode that is difficult to detect without a full system calibration check.

EMC performance is achieved through the coaxial cable geometry itself: the braid acts as a Faraday shield, attenuating radiated interference from adjacent motor drives, welding equipment, and high-current bus bars. The probe tip is electrically isolated from the machine casing through the mounting thread, preventing ground loop currents from modulating the measurement signal — a common source of 50/60 Hz noise in poorly grounded installations.

System Integration Benefits

• Drop-in OEM Replacement: Electrically and mechanically equivalent to the standard 330905-00-14-10-02-00; no re-wiring, re-configuration, or Proximitor recalibration required for existing 3300 XL installations.
• Factory-Matched Scale Factor: Probe, extension cable, and Proximitor are calibrated as a set at the factory. The 7.87 V/mm scale factor is verified across the full linear range before shipment, eliminating the need for field calibration and reducing commissioning time.
• API 670 Compliance: The measurement chain meets the radial vibration and axial position channel requirements of API Standard 670 (5th Edition), supporting use in machinery protection systems on critical rotating equipment in oil, gas, and petrochemical service.
• Wide Frequency Bandwidth (DC to 10 kHz): Captures subsynchronous instabilities (oil whirl, surge), synchronous 1× and 2× components, and high-frequency blade-pass or gear-mesh events within a single channel — no additional signal conditioning required for most turbomachinery applications.
• Deterministic Signal Latency: The analog output voltage from the Proximitor is available with no digital processing delay, making it suitable for hardwired trip logic where response time is governed by the monitor’s relay output, not a software scan cycle.
• Thermal Stability for Hot-Section Mounting: Rated to +177 °C at the probe tip, the 330905-00-14-10-02-CN can be mounted in bearing housings adjacent to steam turbine exhaust ends and gas turbine compressor casings without thermal derating of the measurement accuracy.
• Diagnostic Transparency: The DC bias voltage at the Proximitor output provides a continuous, real-time indication of the static gap. A shift in bias voltage between maintenance intervals indicates shaft centerline migration, bearing wear, or probe fouling — all detectable without removing the probe from service.
• Reduced Spare Parts Complexity: The -CN variant is electrically identical to the global standard part. Procurement teams can maintain a single spare pool for both China-domestic and export-configured machines, reducing inventory carrying cost and obsolescence risk.

Quality Assurance & Global Logistics

Every 330905-00-14-10-02-CN unit offered through siemensplc.com is sourced from authorized industrial distribution channels or verified surplus stock with full traceability documentation. Prior to dispatch from our Xiamen, China facility, each probe undergoes a pre-shipment inspection covering housing integrity, connector condition, cable armor continuity, and label/serialization verification against Bently Nevada production records where applicable. Original OEM packaging is preserved wherever available. A Certificate of Conformance (CoC) and commercial invoice are included with every shipment as standard; test reports and material traceability documentation are available upon request for critical-service or SIL-rated applications.

Xiamen’s port infrastructure supports direct air freight to major industrial hubs including Houston, Rotterdam, Singapore, and Dubai with transit times of 3–5 business days for standard air cargo. DHL Express and FedEx International Priority services are available for urgent requirements, with same-day dispatch for orders confirmed before 14:00 CST. Sea freight consolidation is available for multi-unit orders where lead time permits. All export documentation — including HS code classification, commercial invoice, and packing list — is prepared in compliance with Chinese customs regulations and the import requirements of the destination country.

Contact Information

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