Bently Nevada 31000-16-05-00-063-03-02 Proximity Probe Assembly – 3300 XL Series

Bently Nevada 31000-16-05-00-063-03-02 — Eddy-Current Proximity Probe Assembly for Rotating Machinery Protection

The Bently Nevada 31000-16-05-00-063-03-02 is an 8 mm eddy-current proximity probe housing assembly belonging to the 3300 XL measurement system. It provides continuous, non-contact displacement sensing of rotating shafts in turbomachinery, compressors, and critical process equipment. The part number encodes a complete mechanical and electrical specification: 16 mm probe body diameter, 5 m integral cable, armored jacket, M10×1.0 mounting thread, and MIL-C-5015 bayonet connector — each digit eliminating field ambiguity during procurement and installation.

In a machinery protection loop, this probe operates as the primary sensing element. It converts the gap distance between its tip and the target shaft surface into a proportional DC voltage, typically –10 VDC at the nominal 1.0 mm (40 mil) operating gap. That analog signal feeds directly into a Bently Nevada Proximitor® driver (e.g., 330180-91-00), which conditions and transmits the measurement to a 3500-series monitor rack for alarm and trip processing. The mechanical precision of the housing — thread pitch, tip recess depth, and locknut geometry — determines whether the probe operates within its linear range and whether the system meets API 670 calibration tolerances.

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Technical Parameters

Hardware Logical Analysis

The eddy-current measurement principle relies on the interaction between a high-frequency oscillating magnetic field — generated by the probe coil at approximately 1 MHz — and the conductive target surface. As the gap changes, the induced eddy currents alter the coil impedance, and the Proximitor® driver converts that impedance shift into a calibrated DC voltage. The 31000-16-05-00-063-03-02 housing is machined to hold the coil assembly at a fixed recess depth relative to the probe tip face, ensuring the electromagnetic field geometry matches the factory calibration curve without field adjustment.

The 316L stainless steel body provides two simultaneous functions: structural rigidity under the torque loads applied during installation (typically 20–25 N·m on the M10 locknut) and electromagnetic transparency, since austenitic stainless steel is non-ferromagnetic and does not distort the probe field pattern. The armored cable jacket — a corrugated stainless-steel conduit over a fluoropolymer-insulated twisted pair — attenuates mechanical vibration transmitted from the machine casing to the cable, reducing microphonic noise that would otherwise appear as false displacement signal at shaft rotational frequency harmonics.

The MIL-C-5015 bayonet connector at the cable terminus provides a positive locking mechanism rated for 500 mating cycles, with gold-plated contacts that maintain contact resistance below 10 mΩ across the operating temperature range. This matters because the Proximitor® driver circuit is sensitive to cable impedance: a 1 Ω increase in loop resistance shifts the output by approximately 0.13 V, which at 7.87 V/mm scale factor corresponds to a 16.5 µm position error — detectable in high-precision axial position monitoring applications.

EMC performance is achieved through the coaxial cable geometry (shield grounded at the driver end only, per Bently Nevada wiring practice) and the armored outer jacket, which provides a Faraday shield against capacitively coupled interference from adjacent power cables. In installations near variable-frequency drives (VFDs) or high-current bus bars, this shielding architecture maintains signal integrity without requiring additional conduit separation beyond API 670 §6.3 minimum spacing requirements.

System Integration Benefits

• Drop-in OEM Compatibility: Dimensionally and electrically identical to the original factory specification. No re-calibration of the paired 3300 XL Proximitor® or 3500-series monitor is required upon replacement, preserving existing alarm and trip setpoints.
• Full Part-Number Traceability: Each suffix digit encodes a specific mechanical or electrical attribute. Procurement teams can verify the correct configuration from the part number alone, eliminating the risk of installing a mismatched probe-cable-connector combination.
• API 670 Compliance: Accepted by EPC contractors and end-users operating under API 670 machinery protection requirements. Simplifies FAT and SAT documentation for new installations and replacement projects.
• Broad Temperature Qualification: The –40 °C to +177 °C range covers both cryogenic compressor bearing pedestals and hot-section steam turbine applications without requiring a separate high-temperature variant.
• IP67 Sealing: Protects the probe body and cable entry from process fluid ingress in wet gas, lube oil mist, and washdown environments, reducing unplanned maintenance intervals.
• 316L SS Chemical Resistance: Withstands H₂S, chloride-bearing process streams, and hydrocarbon condensates common in upstream oil and gas and petrochemical service, extending service life beyond carbon steel alternatives.
• Deterministic Signal Latency: The passive probe-cable-driver architecture introduces no digital processing delay. The analog output tracks shaft displacement in real time, with a frequency response flat to 10 kHz — sufficient to resolve blade-pass frequencies in most industrial turbomachinery.
• Diagnostic Transparency: The –10 VDC nominal gap voltage provides a direct, measurable reference for field verification. Technicians can confirm correct installation gap with a standard DVM without specialized test equipment, reducing commissioning time.

Quality Assurance & Global Logistics

Every unit of the Bently Nevada 31000-16-05-00-063-03-02 supplied through siemensplc.com is sourced from verified industrial distribution channels with documented supply chain traceability. Pre-shipment inspection includes dimensional verification of thread pitch and probe tip recess depth, continuity and insulation resistance testing on the integral cable (IR >100 MΩ at 500 VDC), connector mating force and locking engagement check, and visual inspection of the armored jacket for kinks or crush damage. A Certificate of Conformance (CoC) is available upon request for regulated industries and EPC project documentation packages.

Shipments originate from Xiamen, China, with same-day or next-business-day dispatch for in-stock orders. Export documentation — commercial invoice, packing list, and HS code declaration — is prepared to DHL, FedEx, and UPS international standards. Transit times to major industrial hubs: Southeast Asia 2–4 days, Europe 3–5 days, North America 4–6 days. For project orders requiring consolidated shipment or third-party inspection, contact the sales team for a tailored logistics plan.

Contact Information

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