Bently Nevada 330103-00-17-10-02-CN Proximity Transducer System – 3300 XL Series

Bently Nevada 330103-00-17-10-02-CN — Eddy-Current Proximity Transducer System in Rotating Machinery Protection Loops

The 330103-00-17-10-02-CN is a factory-assembled, three-component eddy-current proximity transducer system manufactured by Bently Nevada (a Baker Hughes business). It is engineered for continuous, non-contact measurement of radial shaft vibration and axial position displacement in critical rotating machinery — turbines, centrifugal compressors, pumps, and generators — where API 670 machinery protection requirements govern instrumentation selection.

This specific configuration pairs a 5 mm tip-diameter probe body (330103 series) with a 5-metre (16.4 ft) armored extension cable and an -18 mm threaded housing. The CN suffix identifies a China-region or special-order configuration variant. Electrically and mechanically, the assembly is equivalent to the standard -02 cable-length configuration and integrates directly with Bently Nevada 3300 XL monitor input channels without requiring scale-factor recalibration.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-17-10-02-CN operates on a three-node signal chain: probe oscillator → extension cable → Proximitor® oscillator-demodulator driver. Understanding the hardware logic at each node is essential for correct installation and fault isolation.

Probe Oscillator Node: The probe tip houses a flat coil wound on a ferrite core. The coil is driven at a carrier frequency in the range of 500 kHz to 2 MHz (exact frequency is factory-set and matched to the Proximitor driver). When the conductive target shaft enters the electromagnetic field, eddy currents are induced on the shaft surface, loading the coil and reducing its Q-factor. The resulting impedance change is proportional to the air gap distance with a resolution below 1 µm under stable thermal conditions. The 5 mm tip diameter constrains the field penetration depth to approximately 0.5 mm into the target surface — sufficient for steel shafts but requiring recalibration for non-ferrous alloys such as Inconel or titanium.

Extension Cable Signal Integrity: The 5-metre armored cable is a coaxial assembly with a characteristic impedance matched to the probe-driver system. The stainless-steel armor braid provides dual-layer EMC shielding, attenuating external RF interference from variable-frequency drives (VFDs), high-voltage switchgear, and adjacent instrumentation buses. Cable capacitance is factory-trimmed to maintain the system scale factor within ±10% across the full 5-metre run. Field-cutting or splicing the cable invalidates the calibration and is explicitly prohibited by Bently Nevada installation guidelines.

Proximitor® Oscillator-Demodulator: The driver demodulates the carrier signal and outputs a DC voltage linearly proportional to gap distance: –2 VDC at minimum gap (0.25 mm) and –18 VDC at maximum gap (2.25 mm), yielding a 16 V span across a 2 mm linear range. The negative-polarity output convention is a deliberate design choice — a cable open-circuit or probe failure drives the output to –24 VDC (supply rail), which is outside the normal measurement window and triggers a not-OK alarm on 3300 series monitors without requiring additional fault-detection circuitry. This fail-safe architecture is a core element of API 670 compliance.

EMC Design: The system’s differential signal architecture and coaxial cable geometry provide common-mode rejection of ground-loop noise. The probe housing is constructed from 316 stainless steel, which is non-magnetic and does not distort the eddy-current field. The armored cable jacket is bonded to the probe housing ground at one end only (single-point grounding) to prevent shield current loops that would introduce 50/60 Hz noise into the measurement signal.

System Integration Benefits

• Direct 3300 XL Monitor Compatibility: The 330103-00-17-10-02-CN plugs directly into 3300/16 and 3300/20 monitor input channels. No jumper changes, no scale-factor reprogramming — the monitor reads the –2 to –18 VDC output natively and applies pre-configured alarm and danger setpoints immediately.
• API 670 Machinery Protection Compliance: The system meets the full instrumentation specification of API Standard 670 (5th Edition) for radial vibration and axial position measurement on critical rotating equipment, satisfying insurance, regulatory, and OEM warranty requirements.
• Deterministic Real-Time Response: DC-coupled output with a 10 kHz bandwidth ensures that sub-synchronous instabilities (oil whirl at 0.43–0.48× running speed), synchronous unbalance, and super-synchronous blade-pass frequencies are all captured within a single measurement channel without aliasing.
• Keyphasor® Phase Reference Integration: When used as a Keyphasor® transducer (once-per-revolution notch or key detection), the 330103 probe provides the phase reference signal required for synchronous time averaging, orbit plot generation, and rotor balancing calculations in System 1 and other condition monitoring platforms.
• Fail-Safe Not-OK Detection: Open-circuit or short-circuit probe faults drive the output outside the –2 to –18 VDC window, triggering the monitor’s not-OK relay without additional wiring or logic — reducing diagnostic latency from minutes to milliseconds.
• Wide Thermal Operating Envelope: Probe rating to +177 °C accommodates hot-section turbine bearing housings and steam-end bearing pedestals where ambient temperatures routinely exceed the limits of standard industrial sensors.
• Non-Contact Zero-Wear Operation: Absence of mechanical contact between probe and shaft eliminates sensor wear, lubrication requirements, and periodic replacement cycles associated with contact-type displacement sensors, reducing lifecycle maintenance cost.
• Retrofit Drop-In Replacement: Thread geometry (M8 × 1.0), cable length (5 m), and connector type (BNC) match the original 3300 XL installation envelope, enabling direct replacement of end-of-life units without mechanical modification to bearing housings or junction boxes.
• Diagnostic Transparency via Orbit Plots: Dual-plane installation (X–Y, 90° apart) feeds two channels into the 3300 monitor, enabling real-time rotor orbit visualization — a direct graphical representation of shaft centerline motion that distinguishes unbalance, misalignment, rub, and fluid instability by orbit shape alone.
• IP67 Environmental Sealing: The probe and cable assembly withstand wash-down, oil mist, and condensation ingress, maintaining measurement integrity in compressor seal-oil environments and outdoor installations without additional protective enclosures.

Quality Assurance & Global Logistics

Every unit of the 330103-00-17-10-02-CN stocked at siemensplc.com is sourced through verified supply channels with full part-number traceability back to Bently Nevada / Baker Hughes manufacturing records. Pre-shipment inspection covers dimensional verification of thread geometry and cable length, continuity and insulation resistance testing of the coaxial cable assembly, output voltage spot-check at nominal –24 VDC supply, and visual inspection of probe tip, armor jacket, and BNC connector for mechanical damage. Units are dispatched in original OEM packaging or equivalent ESD-safe protective packaging with desiccant and humidity indicator cards.

Logistics operations are based in Xiamen, China — a major southeastern port city with direct air freight connections to Hong Kong, Singapore, Frankfurt, Los Angeles, and Dubai. Standard international shipments reach Southeast Asia within 3–5 business days, Europe within 5–8 business days, and North America within 5–7 business days via DHL Express, FedEx International Priority, or UPS Worldwide Expedited. Expedited same-day dispatch is available for orders confirmed before 14:00 CST. All shipments include commercial invoice, packing list, and certificate of conformance. Export documentation for ATEX-rated variants is prepared in compliance with destination-country import requirements.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed with a target response time of 48 hours. Replacement units are dispatched before return of the defective item for customers with established accounts, minimizing plant downtime.

Contact Information

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