Bently Nevada 330103-02-12-05-02-CN Proximity Probe – 3300 XL Series

Bently Nevada 330103-02-12-05-02-CN — 8mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The 330103-02-12-05-02-CN is a non-contact eddy-current proximity probe manufactured by Bently Nevada (a Baker Hughes company) as part of the 3300 XL 8mm Proximity Transducer System. Within a machinery protection loop, this probe serves as the primary sensing element responsible for converting mechanical displacement — shaft radial vibration, axial position, and eccentricity — into a proportional DC voltage signal. The output is consumed downstream by Bently Nevada 3500 Series monitor racks, third-party DCS inputs, or condition monitoring platforms such as System 1.

The probe operates on the eddy-current principle: a high-frequency oscillator (typically 1.0 MHz) drives a coil wound at the probe tip, generating an electromagnetic field. When a conductive target (AISI 4140 steel, standard) enters the field, eddy currents are induced on the target surface, loading the oscillator circuit. The driver/proximitor converts this impedance change into a linear DC voltage output at a calibrated scale factor of 7.87 V/mm (200 mV/mil). The result is a continuous, wear-free measurement with a frequency response flat from DC to 10,000 Hz — sufficient to resolve sub-synchronous instabilities, oil-whirl, and blade-pass events in high-speed rotating machinery.

The -CN suffix designates the Chinese-standard connector configuration, making this variant the preferred choice for installations in Chinese refineries, power plants, and petrochemical facilities where the CN connector is the site standard. Electrically, the probe is identical to the international (−00) variant; only the physical connector body differs.

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Technical Parameters

Hardware Logical Analysis

The 330103-02-12-05-02-CN probe is the passive sensing element in a three-component matched system. Its hardware design reflects several deliberate engineering decisions:

Coil Geometry and Gap Linearity: The 8mm tip diameter is optimized for a linear measurement range of 0.25–2.26 mm. The coil winding geometry is factory-tuned to produce a monotonic, near-linear impedance-vs-gap curve across this window. Deviations from linearity at the extremes of the range are characterized and documented in the calibration data sheet shipped with each unit. The 8mm form factor represents the industry’s most widely deployed size for turbomachinery shaft monitoring, balancing spatial resolution against sensitivity to target surface finish variations.

EMC Design: The probe cable uses a coaxial construction with a continuous shield bonded at the probe body. This architecture suppresses capacitive coupling from adjacent high-voltage cabling — a common interference source in motor control rooms and switchgear environments. The driver’s oscillator operates at ~1.0 MHz, well above the 50/60 Hz power-frequency band and its harmonics, providing inherent rejection of mains-frequency interference without additional filtering. The CN connector’s metal shell provides a 360° shield termination, maintaining shield continuity through the connection point.

Thermal Stability: The probe body is rated to +177°C, covering the majority of steam turbine bearing housing environments. The integral cable insulation uses a fluoropolymer compound selected for low dielectric constant drift over the operating temperature range, which would otherwise introduce a temperature-dependent shift in the effective scale factor. Factory calibration is performed at 25°C; the residual thermal coefficient of scale factor is specified in the product datasheet and is typically <0.5% over the full temperature range.

Target Material Sensitivity: The probe is factory-calibrated against AISI 4140 steel. When the target material differs (e.g., 316 stainless, titanium, or Inconel), the effective scale factor changes due to differences in electrical conductivity and magnetic permeability. Bently Nevada publishes target material correction factors; for critical applications, field calibration against the actual target material is recommended. This is a fundamental characteristic of all eddy-current transducers, not a limitation specific to this model.

Matched System Architecture: The 3300 XL system is designed as a matched set — probe, extension cable, and driver are characterized together. The driver’s internal compensation network is tuned to the specific cable capacitance and probe impedance of the matched system. Substituting a non-matched extension cable or driver will shift the scale factor and gap voltage, potentially outside the monitor’s acceptance window. This design choice trades flexibility for measurement accuracy and system-level traceability.

System Integration Benefits

• Direct 3500 Rack Compatibility: The probe output is accepted natively by Bently Nevada 3500/40M and 3500/42M proximity monitor modules without signal conditioning. The monitor reads gap voltage, dynamic AC vibration amplitude, and DC position simultaneously from a single probe channel.
• API 670 Compliance: The complete 3300 XL system meets API 670 5th Edition requirements for machinery protection instrumentation, satisfying the documentation and performance requirements of most EPC contractors and plant operators in oil & gas and petrochemical sectors.
• DC to 10 kHz Bandwidth: The flat frequency response from DC enables simultaneous measurement of slow-roll eccentricity (quasi-static) and high-frequency vibration events (blade-pass, gear mesh) on a single channel, eliminating the need for separate position and vibration transducers in many applications.
• Non-Contact Operation: Zero mechanical wear on the sensing element. Mean time between replacement is determined by environmental factors (chemical attack, mechanical damage) rather than wear, supporting multi-year continuous operation without scheduled replacement.
• Deterministic Output Impedance: The coaxial cable and matched driver present a defined output impedance to the monitor input. This allows the 3500 rack to perform open-circuit and short-circuit fault detection on the transducer loop, generating a Not-OK (N/OK) relay output within one monitor update cycle (<20 ms) of a cable fault.
• System 1 Integration: The probe’s output, routed through the 3500 rack, is accessible to Bently Nevada System 1 condition monitoring software via the rack’s Ethernet interface. System 1 can trend gap voltage (bearing clearance wear indicator), vibration amplitude, and phase angle over time, supporting predictive maintenance workflows.
• Third-Party DCS Compatibility: The driver output (–24 VDC supply, ±10 VDC signal range) is compatible with standard analog input modules on Siemens S7, ABB 800xA, Emerson DeltaV, and Yokogawa CENTUM DCS platforms. A 4–20 mA transmitter can be inserted between the driver and DCS input if required by the control system architecture.
• Hazardous Area Deployment: ATEX certification (consult current datasheet for specific zone and category) permits installation in Zone 1/Zone 2 classified areas without additional barriers in many configurations, reducing installation cost and complexity in refinery and offshore environments.

Quality Assurance & Global Logistics

Every 330103-02-12-05-02-CN unit supplied by siemensplc.com is sourced through verified distribution channels and undergoes a structured pre-shipment verification process before dispatch from Xiamen, China.

• Authenticity Verification: Units are inspected against Bently Nevada OEM packaging markings, date codes, and part number labeling. Counterfeit detection checks are applied to connector bodies, cable markings, and probe tip geometry.
• Electrical Verification: Each probe is checked for coil continuity, insulation resistance (>100 MΩ at 500 VDC), and cable shield integrity prior to packaging.
• Original Packaging: Units ship in intact OEM packaging with original documentation. Anti-static and moisture-barrier packaging is preserved or replaced with equivalent protection for transit.
• 12-Month Warranty: Coverage against manufacturing defects from date of shipment. Defective units are replaced or credited; field-damaged units are assessed case by case.
• Export Documentation: Commercial invoice, packing list, and certificate of origin are provided as standard. ATEX/CE certificates and calibration data sheets are available on request.
• Logistics: In-stock units ship within 1–3 business days from Xiamen via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. Typical transit times: Southeast Asia 2–4 days; Europe 3–5 days; North America 4–6 days. Freight forwarder handover and sea freight consolidation available for bulk orders.
• Customs Compliance: HS code classification and export control screening are completed prior to shipment. No EAR99 or ECCN restrictions apply to standard proximity probe hardware.

Contact Information

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