Bently Nevada 330103-00-05-50-01-00 Proximity Transducer System – 3300 XL Series

Bently Nevada 330103-00-05-50-01-00: Eddy-Current Proximity Transducer System for Critical Rotating Machinery Protection

The Bently Nevada 330103-00-05-50-01-00 is a factory-matched, three-component eddy-current proximity transducer system belonging to the 3300 XL Series. It is engineered for continuous, non-contact measurement of radial shaft vibration and axial position in turbomachinery operating under API 670 protection mandates. The system integrates a 5 mm diameter probe, a 5-metre low-loss coaxial extension cable, and a 3300 XL 8 mm Proximitor driver into a single calibrated assembly. Its buffered DC voltage output interfaces directly with Bently Nevada 3500 Series protection racks, third-party DCS platforms, and portable data collectors without signal conditioning adapters.

In a typical turbomachinery protection loop, this transducer occupies the first measurement node in the signal chain. The probe is threaded into a machined boss on the bearing housing, positioned perpendicular to the shaft journal at a nominal air gap of 1.27 mm (50 mil). As the shaft rotates, any change in the conductive target distance alters the eddy-current loading on the probe coil. The Proximitor driver converts this impedance variation into a calibrated DC voltage ranging from −2 VDC (minimum gap) to −18 VDC (maximum gap), at a scale factor of 7.87 V/mm (200 mV/mil). This analog output is simultaneously available as a buffered channel for the protection rack and as a raw oscillator tap for spectrum analysis via ADRE 408 DSPi or portable vibration analyzers. The DC-to-10,000 Hz frequency response captures sub-synchronous instabilities, synchronous 1× and 2× components, and high-frequency blade-pass events within a single measurement channel, eliminating the need for parallel sensor installations at the same bearing plane.

The 330103-00-05-50-01-00 is the preferred specification for machinery with shaft diameters below 75 mm and bearing housings with restricted radial clearance, where the 5 mm probe body (M8×1.0 thread) provides the necessary geometric fit without compromising the structural integrity of the housing wall. For larger machinery requiring a 14 mm linear range, the 330104 series with an 8 mm probe tip is the appropriate alternative.

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Technical Parameters

Hardware Logical Analysis

The 330103-00-05-50-01-00 operates on a three-node matched-impedance architecture. The probe coil generates a high-frequency oscillator field (nominally 1 MHz carrier) that penetrates the conductive shaft target. Eddy currents induced in the target surface create a back-EMF that loads the probe coil, shifting its resonant impedance. The Proximitor driver continuously measures this impedance shift and demodulates it into a proportional DC voltage. Because the probe, extension cable, and driver are factory-matched as a system, the parasitic capacitance and inductance of the 5-metre cable are pre-compensated in the driver’s oscillator tuning circuit, maintaining the ±1% scale factor accuracy across the full cable run without field trimming.

The probe body is constructed from 316L stainless steel with a PEEK (polyether ether ketone) tip encapsulant, providing chemical resistance to hydrocarbon process fluids, lube oil, and steam condensate. The armored tip design withstands incidental contact with the shaft during slow-roll without fracturing the sensing coil. The M8×1.0 thread allows installation torque to be applied to the body hex, not the tip, preserving coil geometry and calibration integrity after installation.

EMC performance is achieved through the coaxial cable’s double-shield construction: an inner braid shield referenced to the driver’s oscillator ground, and an outer foil shield connected to chassis ground at the driver end only. This single-point grounding topology eliminates ground loop currents that would otherwise appear as low-frequency noise on the output signal. In high-EMI environments such as variable-frequency drive motor rooms or switchgear rooms, the output signal maintains a noise floor below 25 mV peak-to-peak, which corresponds to a position resolution of approximately 3.2 µm — sufficient for detecting early-stage bearing wear before it reaches alarm thresholds.

The Proximitor driver incorporates an internal watchdog circuit that monitors oscillator amplitude. If the probe cable is open-circuited or short-circuited, the driver drives the output to −24 VDC (beyond the normal −18 VDC maximum), which the 3500 rack interprets as a Not-OK condition and triggers a system alert without requiring a separate fault relay. This fail-safe behavior is defined in API 670 Section 5.3 and is a mandatory requirement for machinery protection systems on critical trains.

System Integration Benefits

• Direct 3500 Rack Compatibility: The −2 to −18 VDC output at 200 mV/mil matches the input specification of all 3500 Series I/O modules (3500/42M, 3500/40M, 3500/25) without signal conditioning, reducing wiring complexity and eliminating potential signal degradation points.
• Dual-Output Architecture: The buffered voltage output and raw oscillator tap are simultaneously available, allowing the protection rack and a portable ADRE data collector to operate in parallel without signal loading effects on either channel.
• API 670 Drop-In Replacement: The 330103-00-05-50-01-00 is dimensionally and electrically identical to previous 3300 XL installations, enabling direct replacement without modifying bearing housing bosses, cable trays, or rack configuration files.
• Deterministic Frequency Response: The flat DC-to-10 kHz bandwidth ensures that all vibration components relevant to machinery diagnostics — including sub-synchronous oil whirl (typically 0.3–0.48×), synchronous 1×, and blade-pass frequencies up to 10× on high-speed compressors — are captured within a single channel with no phase distortion below 5 kHz.
• ATEX Zone 0 Approval: The Ex ia IIC T6 intrinsic safety rating permits installation in the most hazardous classified areas, including the interior of gas-blanketed compressor casings, without requiring purged or pressurized enclosures for the probe assembly.
• Fail-Safe Not-OK Output: The driver’s watchdog-driven fault output (−24 VDC on cable fault) integrates with the 3500 rack’s Not-OK logic to generate a system-level alert, providing diagnostic transparency at the rack level without additional field wiring.
• Wide Thermal Operating Range: The probe’s −35 °C to +177 °C rating covers cryogenic LNG service at the cold end and high-temperature steam turbine bearing housings at the hot end, making this a single-specification solution across diverse process industries.
• Matched-System Calibration Traceability: Each probe, cable, and driver set is serialized and calibrated together at the factory. The calibration certificate documents the actual measured scale factor, linearity error, and temperature coefficient for the specific serial number combination, supporting ISO 9001 calibration record requirements.

Quality Assurance & Global Logistics

Every Bently Nevada 330103-00-05-50-01-00 unit offered through siemensplc.com is sourced from verified distribution channels with full traceability documentation. Prior to dispatch, each system undergoes a structured incoming inspection protocol: visual examination of probe tip and cable connectors, dimensional verification of the M8×1.0 thread and tip standoff, and functional verification of the Proximitor output voltage at three gap positions (25 mil, 50 mil, 75 mil) against the OEM calibration certificate. Units that deviate more than ±2% from the documented scale factor are quarantined and returned to the supplier.

Packaging follows ESD-safe and moisture-barrier standards: the probe assembly is individually bagged with desiccant, the cable is coiled to a minimum bend radius of 50 mm to prevent coaxial dielectric deformation, and the Proximitor driver is packed in anti-static foam within the original OEM carton where available. Each shipment includes a commercial invoice, packing list, and certificate of origin issued from Xiamen, China.

Logistics are handled via DHL Express and FedEx International Priority from our Xiamen warehouse. Standard transit times are 3–5 business days to Europe and North America, 2–3 business days to Southeast Asia and the Middle East. For urgent plant shutdowns requiring same-day dispatch, contact us before 14:00 CST to confirm stock availability and expedited booking. Export documentation for customs clearance — including HS code classification, ECCN determination, and end-user declaration where required — is prepared by our in-house trade compliance team.

Contact Information

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