Bently Nevada 330171-00-12-10-02-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330171-00-12-10-02-CN — Eddy-Current Proximity Transducer System for Critical Rotating Machinery Protection

The 330171-00-12-10-02-CN is a factory-assembled 3300 XL Proximitor® Transducer System manufactured by Bently Nevada (a Baker Hughes company). It integrates a 25 mm eddy-current probe, a 12-inch (305 mm) armoured probe cable, a 10-metre extension cable, and a Proximitor® signal conditioning module into a single, pre-matched assembly. The system delivers a DC-coupled, voltage-proportional output that represents the instantaneous gap between the probe tip and the observed conductive target surface — typically a rotating shaft journal or thrust collar. This output is consumed directly by 3300 or 3500 Series monitor racks to generate vibration, position, and eccentricity measurements in compliance with API 670 machinery protection requirements.

The CN suffix designates the China-market configuration: documentation is supplied in both English and Simplified Chinese, compliance paperwork aligns with GB/T standards, and the connector assembly (position 5 = 02) uses a MIL-spec coaxial termination compatible with standard Chinese plant cabling practice. The assembly is factory-calibrated as a matched set; probe, extension cable, and Proximitor® bear the same serial-number group and must not be interchanged with components from other assemblies without recalibration.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 3300 XL Proximitor® operates on the principle of high-frequency eddy-current induction. The probe coil, driven by the Proximitor® oscillator at approximately 1.0 MHz, generates an alternating electromagnetic field that penetrates the target surface. As the conductive target approaches the probe tip, eddy currents induced in the target surface load the oscillator circuit, reducing its amplitude. The Proximitor® demodulates this amplitude-modulated carrier and outputs a DC voltage linearly proportional to the probe-to-target gap across the calibrated measurement range.

EMC Design: The coaxial cable construction — with a continuous braided shield bonded at both the probe body and the Proximitor® input — provides greater than 60 dB of common-mode rejection against plant-frequency interference (50/60 Hz) and variable-frequency drive (VFD) switching noise up to 20 kHz. The Proximitor® housing is die-cast aluminium with an internal copper foil liner, achieving an additional 20 dB of shielding effectiveness at frequencies above 100 kHz. This is critical in petrochemical environments where high-power motor drives and welding equipment operate in close proximity to measurement cabling.

Matched-Set Calibration: The probe, extension cable, and Proximitor® are calibrated as a matched set at the factory. The extension cable’s distributed capacitance and inductance are characterised and compensated within the Proximitor® oscillator tuning network. Substituting any single component from a different serial-number group introduces a scale factor error that can exceed ±5%, which is outside the ±1% accuracy specification and will cause false alarm or missed-trip conditions in a protection system.

Intrinsic Safety Architecture: The Proximitor® incorporates internal current-limiting resistors and zener barrier diodes at the supply and output terminals. These passive components limit the maximum energy deliverable to the probe circuit under fault conditions to below the ignition threshold for Group IIC gases (hydrogen, acetylene), satisfying the requirements for Ex ia classification without an external safety barrier in most installations. The barrier parameters are documented in the ATEX certificate and must be verified against the installation’s entity parameters during SIL assessment.

Backward Compatibility: The 3300 XL output signal (−24 VDC supply, 200 mV/mil scale factor) is electrically identical to the legacy 3300 Series specification. Existing 3300/16, 3500/40, and 3500/42 monitor modules accept the 3300 XL Proximitor® without firmware changes, provided the monitor’s gap voltage setpoints and scale factor configuration are verified after installation.

System Integration Benefits

• API 670 Fifth Edition Compliance: The 330171-00-12-10-02-CN satisfies the transducer performance requirements of API 670 for radial vibration, axial position, and differential expansion measurements, enabling direct use in machinery protection systems without additional qualification testing.
• Deterministic DC-Coupled Output: The DC-coupled voltage output eliminates the phase shift and amplitude roll-off associated with AC-coupled transducers at low shaft speeds (below 600 RPM), ensuring accurate eccentricity and slow-roll runout measurements during turbine start-up and coast-down.
• 10 kHz Flat Frequency Response: The −3 dB bandwidth of 10,000 Hz captures sub-synchronous instabilities (oil whirl at 0.43–0.48×), synchronous (1×), and high-order harmonics (up to ~16× at 3,600 RPM) within a single measurement channel, reducing the number of transducers required per bearing.
• Rack-Level Diagnostic Transparency: When paired with a 3500 Series monitor, the Proximitor® gap voltage is continuously monitored by the rack’s OK circuit. A gap voltage outside the −2 V to −18 V window triggers a NOT OK relay, providing automatic transducer fault detection without operator intervention.
• SIL Loop Compatibility: The intrinsically safe entity parameters (Ui, Ii, Pi, Ci, Li) are documented and certified, enabling the transducer to be incorporated into SIL 1 or SIL 2 safety instrumented functions when paired with a certified safety monitor module and a formal PFD calculation.
• Hazardous Area Zone 0/1 Deployment: ATEX Ex ia IIC T6 Ga certification permits installation of the probe in the most demanding hazardous zones without conduit seals or purged enclosures, simplifying installation in compressor seal areas and turbine bearing pedestals.
• Minimal DCS Integration Overhead: The 4–20 mA or voltage output from the 3500 monitor rack interfaces directly with standard DCS analogue input cards. No signal conditioning module or protocol converter is required between the Bently Nevada rack and Siemens, Emerson, or Yokogawa DCS platforms.
• Reduced Commissioning Time via Pre-Matched Assembly: Factory calibration of the probe-cable-Proximitor® set eliminates field calibration of scale factor and gap voltage, reducing commissioning time per measurement point by approximately 45 minutes compared to individually sourced components.
• Long-Term Spare Parts Availability: The 3300 XL platform has been in continuous production since the mid-1990s. Bently Nevada maintains backward compatibility across monitor generations, protecting the capital investment in existing monitor racks when transducers require replacement.

Quality Assurance & Global Logistics

Every 330171-00-12-10-02-CN unit supplied through siemensplc.com is sourced from verified distribution channels and undergoes a structured incoming inspection protocol before dispatch:

• Physical Integrity Check: Probe tip, cable armour, connector threads, and Proximitor® housing are inspected for mechanical damage, corrosion, and label legibility.
• Electrical Verification: Probe coil DC resistance and Proximitor® quiescent current draw are measured and compared against Bently Nevada factory acceptance criteria.
• Serial Number Traceability: The matched-set serial numbers on probe, extension cable, and Proximitor® are cross-referenced to confirm assembly integrity and screened against known counterfeit part databases.
• Anti-Static Packaging: Units are packed in ESD-protective bags with silica gel desiccant and a humidity indicator card, then placed in double-wall corrugated cartons rated for international air freight handling.
• Documentation Package: Each shipment includes a Certificate of Conformance (CoC), packing list, and — for CN-variant units — Chinese-language compliance documentation aligned with GB/T 17626 EMC standards.

Logistics are managed from our warehouse in Xiamen, China. Standard international air freight transit times are 3–7 business days to Southeast Asia, the Middle East, and Europe; 5–10 business days to North and South America. DHL, FedEx, and UPS express services are available. Export documentation (commercial invoice, packing list, HS code 9031.80) is prepared for customs clearance in the destination country. For urgent plant shutdowns, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST.

Contact Information

📧 Email: [email protected]
📱 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com
📍 Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.