Bently Nevada 330103-00-07-50-02-00 Proximity Transducer – 3300 XL Series

Bently Nevada 330103-00-07-50-02-00 — 8 mm Eddy-Current Proximity Transducer System in Rotating Machinery Protection

The Bently Nevada 330103-00-07-50-02-00 is a complete eddy-current proximity transducer system belonging to the 3300 XL 8 mm product family. It is engineered for continuous, non-contact measurement of radial shaft vibration, axial position, differential expansion, and eccentricity in high-speed rotating machinery operating under API 670 machinery protection requirements. The system ships as a matched, factory-calibrated assembly consisting of a probe, an armored extension cable, and a 3300 XL Proximitor® sensor with integral intrinsic-safety barrier — eliminating the field-calibration burden that accompanies unmatched component sets.

In a typical turbomachinery protection loop, this transducer occupies the first link in the signal chain: it converts the physical gap between probe tip and shaft surface into a DC-biased voltage that a Bently Nevada 3300 or 3500 series monitor then conditions, compares against alarm setpoints, and forwards to the plant DCS or safety instrumented system. Because the output is a continuous analog voltage rather than a sampled digital word, the monitor can detect sub-millisecond transient events — blade-pass excitation, oil-whirl onset, rub contact — without the latency penalty inherent in fieldbus-based sensor architectures.

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Technical Parameters

Hardware Logical Analysis

Eddy-Current Transduction Principle. The probe coil, driven by a high-frequency oscillator inside the Proximitor (typically 1.0 MHz carrier), generates an alternating magnetic field that penetrates the conductive shaft surface. As the gap changes, the reflected impedance of the coil shifts, modulating the oscillator amplitude. The Proximitor demodulates this amplitude-modulated signal and outputs a proportional DC voltage. Because the carrier frequency is three orders of magnitude above the mechanical vibration frequencies of interest (0 – 10,000 Hz), the demodulated output faithfully tracks shaft motion without aliasing artifacts.

Matched-System Calibration Architecture. The 330103-00-07-50-02-00 is supplied as a matched set: probe, extension cable, and Proximitor are characterized together at the factory against a reference AISI 4140 steel target. The resulting scale factor of 200 mV/mil is laser-engraved on the Proximitor housing and documented in the accompanying calibration data sheet. This matched approach eliminates the ±5 % sensitivity error that accumulates when probes and drivers from different production lots are combined in the field.

Intrinsic-Safety Barrier Integration (Driver Code -02). The -02 driver variant incorporates a galvanic isolation barrier compliant with ATEX II 1G and FM Class I, Division 1 requirements. The barrier limits the energy that can be delivered to the probe in the event of a fault, preventing ignition of flammable atmospheres in Zone 0/1 installations. The barrier is integrated into the Proximitor housing rather than installed as a separate DIN-rail device, reducing wiring complexity and eliminating the impedance mismatch that external barriers can introduce into the coaxial signal path.

EMC Design. The armored extension cable uses a double-shield construction — an inner foil shield bonded to the coaxial center conductor and an outer braided shield connected to the Proximitor chassis ground. This arrangement provides greater than 60 dB of common-mode rejection against variable-frequency drive (VFD) switching noise and high-voltage ignition interference common in petrochemical environments. The Proximitor enclosure is die-cast aluminum with conductive gaskets, achieving radiated emission compliance per EN 61000-4-3 at 10 V/m field strength.

Cable Impedance Matching. The 7.62 m probe cable and 15.24 m extension cable are manufactured to a controlled characteristic impedance of 95 Ω ± 5 %. Deviations beyond this tolerance alter the resonant frequency of the probe-cable-driver circuit, shifting the linear range and scale factor. Bently Nevada’s matched-set approach guarantees that the total cable assembly impedance falls within the Proximitor’s compensation range, preserving the 200 mV/mil specification across the full operating temperature envelope.

System Integration Benefits

• Direct monitor compatibility: Plug-and-play with Bently Nevada 3300/16, 3300/20, 3500/42M, and 3500/40M monitors. No jumper changes or software scaling adjustments required when replacing a like-for-like unit.
• Deterministic analog output: The continuous DC voltage output eliminates the scan-cycle latency of digital fieldbus sensors. The monitor receives a real-time signal that reflects shaft position at every microsecond, enabling sub-cycle trip response times well below the 1 ms threshold required by API 670 Section 5.
• Intrinsic-safety compliance without external barriers: The integrated -02 barrier reduces panel wiring by eliminating one DIN-rail barrier per channel, freeing approximately 22.5 mm of rail space per measurement point in a 3500 rack installation.
• Wide operating temperature margin: The probe’s −35 °C to +121 °C rating accommodates both arctic-climate outdoor installations and high-temperature bearing housings on steam turbines operating at inlet temperatures above 500 °C, where bearing metal temperatures at the probe mounting boss typically remain below 110 °C.
• Diagnostic transparency via System 1: When connected to a Bently Nevada 3500 rack interfaced with System 1 Evolution software, the transducer’s gap voltage is logged continuously. A drift in the static gap voltage — without a corresponding change in vibration amplitude — indicates shaft centerline migration, bearing wear, or thermal growth, enabling condition-based maintenance decisions before a protective trip occurs.
• Non-contact measurement eliminates wear: Unlike accelerometers mounted on bearing housings, the eddy-current probe measures shaft motion directly with zero mechanical contact. There is no wear mechanism, no coupling grease degradation, and no resonance frequency that limits the upper measurement bandwidth.
• Consistent scale factor across shaft materials: The 200 mV/mil scale factor is characterized for AISI 4140/4340 low-alloy steel. For non-ferrous shafts (titanium, Inconel, stainless), the Proximitor’s internal compensation network can be adjusted using Bently Nevada’s material correction factors, maintaining measurement accuracy without replacing the probe assembly.
• Redundancy-ready architecture: Two 330103-00-07-50-02-00 probes can be mounted 90° apart on the same shaft journal to provide X-Y vibration vector data. The 3500/42M monitor processes both channels simultaneously, enabling orbit plot generation and forward/reverse precession analysis — data that a single-axis measurement cannot provide.

Quality Assurance & Global Logistics

Every unit of the 330103-00-07-50-02-00 stocked at siemensplc.com is sourced through verified supply channels with full traceability to Bently Nevada (Baker Hughes) manufacturing. Each shipment is accompanied by a Certificate of Conformance (CoC) documenting the part number, serial number, manufacturing date code, and applicable approval markings. Anti-counterfeit verification is performed on receipt: holographic labels, connector plating condition, and housing casting quality are inspected against OEM reference samples before the unit enters our inventory.

Our warehouse is located in Xiamen, China — a major international port city with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. In-stock units are dispatched within 24 hours of order confirmation via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, depending on destination and customer preference. Typical transit times are 3 – 5 business days to Europe and North America, 2 – 3 business days to Southeast Asia and the Middle East. For critical plant shutdowns requiring same-day dispatch, contact our team before 14:00 CST to confirm cut-off eligibility.

Export documentation — commercial invoice, packing list, and HS code classification — is prepared in compliance with Chinese customs regulations and the import requirements of the destination country. ATEX and FM certification documents are included with every shipment to facilitate customs clearance in regulated markets. All units carry a 12-month warranty from the date of shipment, covering manufacturing defects under normal operating conditions.

Contact Information

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