Bently Nevada 330905-00-19-10-02-CN Proximity Probe – 3300 NSv

Bently Nevada 330905-00-19-10-02-CN — 8 mm Eddy Current Proximity Probe in the 3300 NSv Transducer Platform

The 330905-00-19-10-02-CN is a factory-configured, non-contacting eddy current proximity probe manufactured by Bently Nevada as part of the 3300 NSv Series transducer platform. It functions as the primary sensing element in a three-component measurement chain — probe, extension cable, and proximitor driver — delivering continuous, high-resolution shaft displacement data to machinery protection and condition monitoring systems. The probe is designed for permanent installation on rotating machinery where API 670 compliance is a contractual or regulatory requirement, including steam turbines, gas turbines, centrifugal compressors, and high-speed pumps operating in petrochemical, power generation, and refinery environments.

The -02 suffix in the part number designates a 5-metre (16.4 ft) integral armored cable, distinguishing it from the shorter -01 variant. This cable length is selected for installations where the probe mounting flange is physically remote from the proximitor driver enclosure, eliminating the need for an intermediate junction. The probe tip diameter is 8 mm (5/16 in), threaded at 3/8-24 UNF for direct installation into standard API 670-compliant probe holders without adapter hardware.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 330905-00-19-10-02-CN is grounded in Faraday’s law of electromagnetic induction. The probe tip houses a precision-wound coil driven by a high-frequency oscillator (typically 1.0 MHz carrier) embedded in the paired proximitor driver. This oscillating field penetrates the surface of the conductive target shaft, inducing circulating eddy currents whose magnitude is an inverse function of the air gap distance. As the gap decreases, eddy current density increases, loading the oscillator circuit and reducing the coil’s effective impedance — a change the proximitor demodulates into a proportional DC voltage output.

The 8 mm tip geometry is a deliberate engineering trade-off: it provides a linear range of 0.25–2.54 mm, which covers the full operational clearance envelope of most journal bearing designs without requiring the larger 11 mm or 25 mm probes used in low-frequency, large-gap applications. The 3/8-24 UNF thread pitch is fine enough to allow sub-millimetre axial positioning adjustments during installation, enabling precise gap setting to the 1.0 mm (40 mil) nominal center-of-range target without special tooling.

The 5 m integral cable is constructed with a low-loss coaxial geometry — a silver-plated center conductor, PTFE dielectric, and braided shield — maintaining signal integrity at the 1 MHz carrier frequency over the full cable run. The cable’s characteristic impedance is matched to the proximitor input, preventing reflections that would introduce measurement error. The armored outer jacket provides mechanical protection against abrasion and crush loads in turbine pedestals and compressor skids where cable routing is constrained.

EMC performance is achieved through the coaxial shield continuity from probe tip to proximitor input, providing a Faraday cage effect that attenuates externally coupled RF interference. The gold-plated coaxial connector at the cable terminus maintains contact resistance below 5 mΩ over the service life, preventing galvanic corrosion-induced signal degradation in humid or chemically aggressive environments. The IP67 rating of the probe body ensures the sensing coil assembly remains sealed against process fluid ingress during wash-down or condensation events, preserving calibration stability without field recalibration.

System Integration Benefits

• Direct API 670 compliance: The 330905-00-19-10-02-CN meets the transducer performance requirements of API Standard 670 (5th Edition), allowing drop-in use in new machinery protection system designs and replacement of legacy probes without re-engineering the monitoring rack configuration.
• Deterministic DC output for real-time control: The –2 VDC to –18 VDC output is a true DC signal with no latency introduced by signal conditioning. DCS analog input cards and Bently Nevada 3500 Series rack monitors receive gap data with sub-millisecond update rates, supporting deterministic alarm and trip logic execution.
• Zero-wear sensing for continuous duty: Non-contacting measurement eliminates probe wear, bearing contamination from sensor debris, and periodic replacement cycles associated with contact-type displacement sensors. Mean time between replacement is governed by environmental factors rather than mechanical fatigue.
• Matched-system calibration traceability: Factory calibration is performed as a matched set — probe, extension cable, and proximitor — ensuring the 7.87 V/mm scale factor is accurate across the full linear range. Substituting unmatched components introduces scale factor error that cannot be corrected by software gain adjustment alone.
• Wide thermal operating envelope: The –35 °C to +177 °C range accommodates both cryogenic service (LNG compressors) and high-temperature turbine bearing housings without probe substitution, reducing spare parts inventory complexity for multi-service plants.
• Broadband frequency response to 10 kHz: The DC–10,000 Hz (–3 dB) bandwidth captures shaft dynamic events including subsynchronous instability (oil whirl/whip), synchronous unbalance, and gear mesh frequencies up to 10× running speed for machines operating at up to 60,000 RPM.
• Diagnostic transparency via orbit and centerline plots: The DC-coupled output preserves both the AC vibration component and the DC position component simultaneously, enabling shaft centerline migration analysis and rotor orbit reconstruction in Bently Nevada System 1 or equivalent condition monitoring software without additional signal processing hardware.
• Interoperability with third-party monitors: The standard voltage output is compatible with any analog input module accepting –18 VDC to –2 VDC signals. Integration with Emerson DeltaV, Honeywell Experion, ABB 800xA, and Yokogawa CENTUM VP DCS platforms requires only standard analog input configuration — no proprietary protocol or driver is needed.

Quality Assurance & Global Logistics

Every unit of the 330905-00-19-10-02-CN supplied through siemensplc.com is sourced from authorized industrial distribution channels with full manufacturing traceability. Prior to dispatch from our Xiamen, China facility, each probe undergoes a structured pre-shipment inspection protocol: physical integrity check of the probe body, tip, and cable armor; connector contact resistance measurement; cable continuity and shield isolation verification; and label authentication against Bently Nevada manufacturing records to confirm part number, date code, and serial number consistency.

Original OEM packaging is preserved wherever available. Factory calibration certificates are available upon request for units requiring documented traceability to NIST-traceable standards. For projects requiring third-party recalibration, we can coordinate with accredited metrology laboratories to provide calibration reports conforming to ISO/IEC 17025.

Logistics from Xiamen are executed via DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with typical transit times of 3–5 business days to major industrial hubs in Southeast Asia, the Middle East, Europe, and the Americas. Full export documentation — commercial invoice, packing list, certificate of origin, and HS code 9031.80.90.90 classification — is prepared for every shipment to facilitate customs clearance without delay. For urgent plant shutdown requirements, same-day dispatch is available for in-stock units confirmed before 14:00 CST.

A 12-month warranty from the date of shipment covers manufacturing defects and calibration conformance. Warranty claims are processed with replacement dispatch within 5 business days upon receipt and inspection of the returned unit.

Contact Information

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