Bently Nevada 330105-02-12-10-05-05 Proximity Transducer – 3300 XL Series

Bently Nevada 330105-02-12-10-05-05: Eddy-Current Proximity Transducer for Rotating Machinery Protection

The 330105-02-12-10-05-05 is an 8mm eddy-current proximity transducer within the Bently Nevada 3300 XL Proximity Transducer System — a platform that has established itself as the de facto standard for non-contact shaft displacement measurement in API 670-compliant machinery protection architectures. This transducer functions as the primary sensing element in radial vibration, axial position, and differential expansion measurement channels, converting mechanical shaft motion into a proportional DC voltage signal with a nominal sensitivity of −7.87 V/mm (−200 mV/mil) when paired with the corresponding 3300 XL Proximitor® sensor.

In a rotating machinery protection loop, the transducer is the first link in a signal chain that terminates at a safety-rated monitor rack. Any degradation in probe performance — whether from tip damage, cable impedance drift, or connector corrosion — propagates directly into measurement uncertainty at the monitor level. The 330105-02-12-10-05-05 addresses this by combining a precision-wound coil assembly inside a stainless steel probe body with a fully shielded, armored cable configuration defined by its suffix: -02 (2-meter probe cable), -12 (12-foot extension cable), -10 (10-foot armored extension), -05 (standard connector), -05 (standard Proximitor® connector). This suffix-encoded configuration eliminates field ambiguity and ensures the assembled transducer system meets the electrical length requirements for the 3300 XL signal conditioning chain.

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

Technical Parameters

Hardware Logical Analysis

The 330105-02-12-10-05-05 operates on the principle of electromagnetic induction: the probe coil, driven by a high-frequency oscillator within the Proximitor® sensor (typically 1.0 MHz carrier), generates an alternating magnetic field at the probe tip. When a conductive target enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a measurable change in coil impedance. The Proximitor® demodulates this impedance change into a DC output voltage proportional to the gap between probe tip and target surface.

The 8mm probe diameter of the 330105 series is a deliberate engineering choice. Compared to 5mm probes, the larger coil area produces a wider linear measurement range (0.25–2.25 mm vs. 0.5–1.5 mm for 5mm probes) and a more uniform field distribution, reducing sensitivity to minor shaft surface irregularities such as machining marks or minor runout. This is critical in high-speed turbomachinery where shaft surface finish directly affects measurement noise floor.

The armored extension cable in the -12-10 suffix configuration provides two layers of electromagnetic shielding: an inner braid shield bonded to the probe cable shield at the junction box, and an outer stainless steel armor that provides mechanical protection against abrasion and crush loads in cable tray installations. The shield is grounded at the Proximitor® end only (single-point grounding), preventing ground loop currents that would appear as low-frequency noise on the output signal. This architecture maintains a cable system impedance within the ±5% tolerance required by the 3300 XL system for accurate sensitivity calibration.

EMC performance is achieved through the combination of coaxial cable geometry, single-point shield grounding, and the Proximitor®’s internal filtering. The probe assembly itself has no active electronics — all signal conditioning occurs in the Proximitor® sensor — which means the probe is inherently immune to conducted EMI on the supply rail. Radiated immunity is governed by the shielding effectiveness of the cable assembly, which exceeds 60 dB attenuation at frequencies above 1 MHz per IEC 61000-4-3 test conditions.

System Integration Benefits

• Direct API 670 Channel Compliance: The 330105-02-12-10-05-05 satisfies the transducer requirements of API 670 Chapter 5 for radial vibration and axial position channels without additional signal conditioning or calibration adapters.
• Deterministic Signal Latency: The passive probe architecture introduces zero processing delay. Signal propagation from shaft motion to Proximitor® output is limited only by cable propagation velocity, keeping total loop latency below 100 µs — well within the response time budget of 3500 Series monitor racks.
• Plug-Compatible with 3500 Series Monitors: Output voltage range (−2 to −18 VDC) and sensitivity (−200 mV/mil) are factory-matched to the input specifications of 3500/40M and 3500/42M monitor modules, enabling direct replacement without monitor reconfiguration.
• Diagnostic Transparency via Gap Voltage: The DC bias voltage at the Proximitor® output provides a continuous, real-time indicator of probe-to-shaft gap. Operators can verify correct installation gap (typically −10 VDC ± 1 V at nominal 1.0 mm gap) without removing the probe from service.
• Suffix-Encoded Configuration Traceability: The full part number encodes all physical configuration parameters, enabling maintenance teams to verify correct replacement parts from documentation alone — reducing the risk of mismatched cable lengths that would shift system sensitivity outside calibration tolerance.
• Wide Target Material Compatibility: Validated for use with AISI 4140 steel, 304 and 316 stainless steel, and Inconel 718 — covering the shaft materials used in the majority of industrial turbomachinery without requiring sensitivity correction factors.
• High-Temperature Probe Rating: The 316 SS probe body and high-temperature cable insulation support continuous operation at up to 177°C, accommodating installations in hot bearing housings and high-ambient-temperature turbine pedestals without derating.
• Redundancy Architecture Support: The standardized probe footprint and connector interface allow dual-probe redundant installations (XY radial vibration pairs) with consistent mechanical spacing, supporting 2oo3 voting logic in safety-instrumented machinery protection systems.

Quality Assurance & Global Logistics

Every 330105-02-12-10-05-05 unit supplied through siemensplc.com is sourced from verified Bently Nevada (Baker Hughes) authorized distribution channels. Bently Nevada’s manufacturing process for the 3300 XL transducer series includes 100% electrical testing of probe coil impedance, cable continuity, and shield integrity prior to shipment from the factory. Each unit ships with original Bently Nevada packaging, part number labeling, and a factory test certificate traceable to the production batch.

Our procurement team in Xiamen, China maintains direct relationships with authorized distributors across Asia-Pacific, enabling access to both current-production and end-of-life 3300 XL series components. Xiamen’s position as a major export hub provides access to daily DHL Express, FedEx International Priority, and UPS Worldwide Express services, with typical transit times of 3–5 business days to Europe, 2–4 days to Southeast Asia, and 4–7 days to North America. For time-critical plant shutdowns, same-day dispatch is available for in-stock items when orders are confirmed before 14:00 CST.

Export documentation — commercial invoice, packing list, certificate of conformance, and HS code classification (HS 9031.80) — is prepared as standard for all international shipments. Letter of Credit (L/C), Telegraphic Transfer (T/T), and other standard B2B payment instruments are accepted. All units carry a 12-month warranty against manufacturing defects from the date of shipment.

Contact Information

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