Bently Nevada 330903-00-16-10-02-05/CN Proximity Probe – 3300 NSv Series

Bently Nevada 330903-00-16-10-02-05/CN — 5 mm Eddy-Current Proximity Probe in the 3300 NSv Transducer System

The 330903-00-16-10-02-05/CN is a 5 mm tip-diameter, eddy-current proximity probe manufactured by Bently Nevada (Baker Hughes) as part of the 3300 NSv (Non-Standard Voltage) Proximity Transducer System. With a 16-inch (406 mm) integral armored cable, this probe is engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in rotating machinery operating under API 670 machinery protection requirements. The /CN suffix designates the China-manufactured variant, produced to the same dimensional and electrical tolerances as the global standard model.

In a typical machinery protection loop, the 330903-00-16-10-02-05/CN occupies the first stage of the signal chain: the probe tip generates a high-frequency oscillating magnetic field (typically 1.0 MHz carrier), which induces eddy currents in the conductive target shaft. The resulting impedance change in the probe coil is converted by the matched 3300 NSv Proximitor driver into a DC voltage proportional to the probe-to-shaft gap. This DC output is then conditioned, filtered, and processed by the monitoring rack — whether a Bently Nevada 3300, 3500, or System 1 platform — to produce vibration amplitude, phase, and position data with sub-micron resolution.

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Technical Parameters

Hardware Logical Analysis

The 330903-00-16-10-02-05/CN operates on the eddy-current (inductive) sensing principle. The probe coil, embedded in the 5 mm tip housing, is driven by a high-frequency oscillator inside the matched Proximitor. When the probe tip approaches a conductive target, the oscillating magnetic field penetrates the shaft surface and induces circulating eddy currents. These currents create a counter-magnetic field that loads the probe coil, reducing oscillator amplitude in direct proportion to the gap distance. The Proximitor demodulates this amplitude-modulated signal and outputs a calibrated DC voltage at 200 mV/mil sensitivity.

EMC and Noise Immunity: The NSv (Non-Standard Voltage) architecture uses a supply rail of −24 VDC rather than the conventional −18 VDC, which extends the output swing to −2 VDC / −18 VDC. This wider dynamic range improves signal-to-noise ratio in electrically noisy plant environments — particularly relevant in variable-frequency drive (VFD) installations where common-mode interference on cable shields is a persistent concern. The stainless-steel armor (code 10) provides mechanical protection and acts as a secondary EMI shield over the coaxial signal conductor.

Coaxial Signal Path Integrity: The 16-inch integral cable is factory-terminated and impedance-matched to the probe coil. Any field modification of cable length — splicing, re-termination — will alter the coil-cable resonant circuit and shift the sensitivity calibration. The system is therefore designed as a three-component matched set: probe + extension cable + Proximitor. The extension cable (330130-xx-xx) compensates for the additional capacitance introduced by longer field runs, maintaining the 200 mV/mil calibration across total cable lengths up to the system-rated maximum.

Thermal Stability: The probe tip housing is constructed from non-magnetic stainless steel, which exhibits low thermal expansion and minimal permeability variation across the −35 °C to +177 °C operating envelope. This ensures that gap voltage drift due to thermal cycling remains within the system’s calibration tolerance, a critical requirement for axial position monitoring on steam turbines where bearing temperatures can approach 150 °C during sustained operation.

Target Material Dependency: Eddy-current sensitivity is a function of target conductivity and permeability. The 330903 series is factory-calibrated against AISI 4140 steel (the API 670 reference material). For shafts machined from alternative alloys — titanium, Inconel, or duplex stainless — a field calibration correction factor must be applied. Bently Nevada publishes material correction tables in the system datasheet; failure to apply these corrections introduces a systematic measurement offset that cannot be compensated by the monitoring rack.

System Integration Benefits

• API 670 Compliance: The 330903-00-16-10-02-05/CN is designed to meet the transducer performance requirements of API Standard 670 (5th Edition), enabling direct use in machinery protection systems for turbines, compressors, and pumps without additional qualification testing.
• Deterministic DC Output: The Proximitor converts the high-frequency carrier to a low-impedance DC voltage output, eliminating frequency-dependent signal conditioning in the monitoring rack and ensuring deterministic latency from gap change to rack alarm — typically under 1 ms for the 3500 platform.
• Non-Contact Measurement: Zero mechanical contact with the rotating shaft eliminates wear, eliminates probe-induced shaft loading, and allows continuous measurement at shaft surface speeds exceeding 200 m/s without signal degradation.
• Sub-Micron Resolution: At 200 mV/mil (7.87 V/mm) sensitivity and with a 3500 rack A/D resolution of 16 bits over a ±10 V input range, the effective gap resolution is approximately 0.3 µm — sufficient to detect early-stage bearing wear before vibration amplitude thresholds are reached.
• Diagnostic Transparency: The DC gap voltage is directly readable at the Proximitor output connector, allowing field technicians to verify probe installation gap (target: −10.0 VDC ± 0.5 V) without energizing the full monitoring rack — a significant advantage during commissioning and maintenance windows.
• Broad Platform Compatibility: The 3300 NSv signal standard is accepted by Bently Nevada 3300, 3500, and System 1 monitoring platforms, as well as third-party racks that support the NSv input specification, protecting the investment in transducer infrastructure across platform upgrades.
• Hazardous Area Suitability: ATEX certification (zone ratings per datasheet) permits installation in Zone 1 and Zone 2 classified areas, covering the majority of oil & gas and petrochemical machinery installations without requiring intrinsically safe barriers in the signal loop.
• Reduced Commissioning Time: Factory calibration at 200 mV/mil eliminates the need for field sensitivity verification on standard AISI 4140 targets. The technician sets the physical gap to achieve −10.0 VDC output and the system is ready for rack configuration — a process that typically takes under 15 minutes per measurement point.

Quality Assurance & Global Logistics

Every 330903-00-16-10-02-05/CN unit supplied by siemensplc.com is sourced through verified distribution channels with full traceability documentation. Incoming inspection covers visual integrity of the probe tip housing, armor continuity, connector pin condition, and coaxial impedance verification. Units are stored in ESD-safe packaging in a climate-controlled warehouse in Xiamen, China, maintaining component integrity prior to shipment.

Shipment from Xiamen reaches major industrial hubs with the following typical transit times: Southeast Asia 2–4 business days (DHL/FedEx express); Europe 3–5 business days; North America 3–6 business days; Middle East and South Asia 3–5 business days. All shipments include commercial invoice, packing list, and Certificate of Conformance (CoC). Test reports and original Bently Nevada documentation are available upon request. The 12-month warranty covers manufacturing defects under normal operating conditions; warranty claims are processed with replacement dispatch within 5 business days of fault confirmation.

Bulk procurement and OEM/MRO standing orders are supported with scheduled release and consignment stocking arrangements. Contact the sales team for volume pricing and lead-time commitments.

Contact Information

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