Bently Nevada 330905-00-16-05-02-00 Proximity Probe – 3300 NSv Series

Bently Nevada 330905-00-16-05-02-00 — Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330905-00-16-05-02-00 is a 16 mm tip-diameter, 5-metre integral-cable eddy-current proximity transducer belonging to the 3300 NSv (Non-Standard Voltage) product family. Its primary function within a machinery protection loop is to convert the air-gap distance between the probe tip and a conductive target surface into a proportional DC voltage signal, delivering continuous, non-contact measurement of radial shaft vibration, axial position, and differential expansion at update rates that exceed the bandwidth requirements of API 670 fifth-edition monitor systems.

Unlike contact-type displacement sensors, the eddy-current operating principle imposes zero mechanical load on the rotating shaft. The probe tip generates a high-frequency electromagnetic field (nominally 1 MHz carrier); when a conductive target enters this field, induced eddy currents attenuate the oscillator amplitude in direct proportion to the gap distance. The driver/oscillator circuit — housed separately in a 330180-series proximitor — demodulates this amplitude variation and outputs a calibrated DC voltage of −1 VDC to −21 VDC across the 0.25 mm to 2.26 mm linear range, at a sensitivity of 7.87 V/mm (200 mV/mil). This architecture separates the high-temperature probe body from the active electronics, allowing the 330905-00-16-05-02-00 to operate continuously at target surface temperatures up to +177 °C without signal drift attributable to thermal derating of semiconductor junctions.

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Technical Parameters

Hardware Logical Analysis

Electromagnetic Field Geometry and Target Interaction: The 16 mm tip diameter of the 330905-00-16-05-02-00 defines the effective sensing diameter of the generated electromagnetic field. At the nominal gap of 1.27 mm (50 mil), the field penetration depth into a standard AISI 4140 steel target is approximately 0.13 mm — well within the surface layer of any machined journal. This shallow penetration depth means the probe output is insensitive to subsurface metallurgical variations, ensuring measurement repeatability across shaft replacement cycles without field recalibration, provided the replacement shaft meets the same alloy specification.

NSv Architecture and Monitor Compatibility: The NSv (Non-Standard Voltage) designation indicates that this probe is calibrated and matched to the 3300 XL monitor platform’s internal signal conditioning chain, which operates at a −24 VDC supply rail rather than the legacy −18 VDC rail used by earlier 3300 series hardware. The extended supply voltage increases the output swing headroom to −1 VDC / −21 VDC, widening the usable linear range by approximately 12% compared to standard-voltage equivalents. This directly reduces the probability of clipping events during high-amplitude transient vibration — such as rub events or critical speed crossings — where instantaneous displacement can momentarily exceed steady-state alarm setpoints.

EMC Design and Armored Cable Construction: The stainless steel armor braid surrounding the PTFE-insulated coaxial core serves a dual function: mechanical protection against abrasion in confined machinery spaces, and electrostatic shielding against capacitively coupled interference from adjacent power cables. The PTFE dielectric maintains a stable characteristic impedance across the full operating temperature range, preventing impedance mismatch reflections that would introduce measurement error at frequencies above 5 kHz — relevant for blade-pass frequency monitoring on high-speed compressors with 10+ impeller vanes operating above 3,000 RPM.

Integral Cable vs. Extension Cable Architecture: The 330905-00-16-05-02-00 uses a 5-metre integral cable, meaning the probe body and cable form a single, factory-matched assembly. This eliminates the connector junction between probe and extension cable that exists in modular transducer configurations. Each connector junction introduces a small but measurable impedance discontinuity; removing it from the signal path reduces high-frequency signal attenuation and eliminates a potential ingress point for moisture or process fluid contamination — a critical consideration in wet-gas compressor or steam turbine environments where condensate accumulation at connector interfaces is a documented failure mode.

System Integration Benefits

• Direct API 670 Compliance: The 330905-00-16-05-02-00 meets the transducer performance requirements of API Standard 670 (5th Edition) for radial vibration and axial position measurement, enabling straightforward compliance documentation for new machinery installations and insurance audits without additional field calibration.
• Plug-Compatible with 3300 XL Monitor Cards: The probe interfaces directly with Bently Nevada 3300 XL 16mm Proximity Transducer Monitor cards (e.g., 3300/16-xx-xx-xx-xx-xx) without adapter hardware, preserving the factory-calibrated sensitivity coefficient stored in the monitor’s non-volatile memory.
• Deterministic Latency in Protection Loops: The DC-to-10,000 Hz flat frequency response ensures that the transducer does not introduce phase lag or amplitude attenuation within the protection system’s voting logic bandwidth, maintaining the sub-millisecond trip response time required for overspeed and high-vibration shutdown functions.
• Reduced Maintenance Interval: Non-contact measurement eliminates bearing-load contribution from the sensor itself. In high-speed applications above 10,000 RPM, contact-type sensors impose measurable dynamic loads; the eddy-current principle removes this variable entirely, extending the interval between scheduled transducer inspections from quarterly to annual in most API 670 maintenance programs.
• Hazardous Area Certification Coverage: Simultaneous ATEX, IECEx, FM, and CSA certifications allow a single part number to be deployed across North American (NEC), European (ATEX), and international (IECEx) hazardous area classifications without sourcing a region-specific variant, simplifying global spare-parts inventory management.
• Diagnostic Transparency via DC Bias Monitoring: The −24 VDC supply and the resulting DC output voltage allow the 3300 XL monitor to perform continuous gap voltage monitoring. A gap voltage outside the −10 VDC ± 2 VDC nominal window triggers a Not OK (NOK) alert, providing real-time diagnostic visibility into probe-to-shaft gap drift caused by bearing wear, thermal growth, or probe mounting looseness — without requiring a separate diagnostic instrument.
• Thermal Stability Across Turbine Casing Gradients: The 316 stainless steel probe body and PTFE cable insulation maintain dimensional and electrical stability across the −35 °C to +177 °C operating envelope. In steam turbine applications where casing temperatures vary by 80–120 °C between cold startup and full-load operation, this thermal stability prevents sensitivity drift that would otherwise require temperature-compensated correction factors in the monitor configuration.
• Drop-In Replacement for Legacy 3300 Installations: The mechanical thread form, tip diameter, and cable connector are dimensionally identical to earlier 3300 series proximity probes, allowing direct replacement in existing probe holders and conduit runs without machining modifications to the machinery casing or bearing housing.

Quality Assurance & Global Logistics

Every 330905-00-16-05-02-00 unit dispatched from our Xiamen, China facility is a factory-original Bently Nevada component sourced through documented industrial supply channels. Prior to shipment, each unit undergoes physical label verification (part number, date code, and serial number cross-check), cable continuity measurement, and coaxial impedance spot-check to confirm the assembly has not been subjected to mechanical damage during transit from the original manufacturing facility.

Packaging conforms to IEC 60068-2 transport vibration and shock requirements: the probe tip is protected by a machined plastic cap, the cable is coiled to a minimum bend radius of 50 mm, and the assembly is sealed in an anti-static bag within a rigid foam-lined carton. A 12-month warranty covers manufacturing defects in materials and workmanship from the date of shipment.

From Xiamen, we maintain established air-freight lanes to major industrial hubs: Shanghai Pudong, Hong Kong, Singapore Changi, Dubai, Frankfurt, Houston, and Rotterdam. Standard in-stock orders ship within 2 business days. Expedited same-day dispatch is available for orders confirmed before 14:00 CST. All shipments include a commercial invoice, packing list, and certificate of conformance upon request. Export classification and customs documentation for CN8 / HTS codes are prepared in-house, reducing clearance delays at destination ports.

Contact Information

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