Bently Nevada 31000-16-10-00-085-03-02 Proximity Probe Assembly – 3300 Series

Bently Nevada 31000-16-10-00-085-03-02 Proximity Probe Assembly: Shaft Displacement Sensing in Rotating Machinery Protection

The Bently Nevada 31000-16-10-00-085-03-02 is a 16 mm eddy-current proximity probe housing assembly from the 31000 Series, designed for continuous, non-contact measurement of shaft radial vibration and axial position in critical rotating machinery. Operating within the Bently Nevada 3300 Series Machinery Protection System architecture, this assembly functions as the primary transducer element in a three-component measurement chain: probe, extension cable, and Proximitor® driver. Its role in the control loop is deterministic — it converts mechanical displacement into a calibrated DC voltage signal that feeds directly into the 3500 Series monitor rack for real-time alarm and trip logic execution.

The part number decodes as follows: 31000 (product family — proximity probe housing assembly), 16 (probe tip diameter: 16 mm / 5/8 in), 10 (probe cable length: 10 ft / ~3 m), 00 (no integral extension), 085 (armored cable, 8.5 m total system length), 03 (connector type: 10-32 UNF coaxial), 02 (temperature/housing material code: stainless steel body, rated to +177°C tip). This configuration is commonly deployed in high-temperature turbine bearing housings where cable routing demands a longer armored run.

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Technical Parameters

Hardware Logical Analysis

The 31000-16-10-00-085-03-02 operates on the principle of electromagnetic induction attenuation. The probe tip houses a wound coil driven by a high-frequency oscillator (typically 1.0 MHz carrier) embedded in the paired Proximitor® driver. As the conductive target (shaft) approaches the probe face, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its output amplitude. This amplitude modulation is demodulated and linearized within the driver to produce the calibrated –24 VDC-referenced output voltage.

The 16 mm probe diameter is significant: larger coil geometry yields a wider linear measurement range (up to 2.54 mm) compared to 8 mm probes (linear range ~1.27 mm), making this variant preferable for large-shaft turbines where thermal growth and bearing clearance tolerances demand extended dynamic range. The stainless steel housing (code 02) provides corrosion resistance in steam-laden or chemically aggressive bearing environments, while the armored cable construction (085 field code) protects signal integrity across the 8.5 m routing path against mechanical abrasion and localized EMI from adjacent motor drives or bus bars.

The coaxial 10-32 UNF connector maintains controlled impedance along the signal path, minimizing reflections that would otherwise introduce measurement error at high shaft speeds (above 3,600 RPM). The probe’s passive architecture — no active electronics at the tip — eliminates failure modes associated with temperature-sensitive semiconductor components in the hot zone, a deliberate design choice that contributes to the assembly’s documented MTBF exceeding 100,000 hours in continuous service.

EMC performance is achieved through the coaxial cable’s continuous shield, which is grounded at the Proximitor® driver end only (single-point grounding), preventing ground loop currents that would appear as low-frequency noise on the displacement signal. In installations near variable-frequency drives, the armored outer jacket provides an additional Faraday shield layer, attenuating radiated interference above 150 kHz.

System Integration Benefits

• Direct compatibility with Bently Nevada 3500 Series monitor racks: The probe’s calibrated sensitivity (7.87 V/mm) is pre-matched to 3500/40M and 3500/42M Proximitor® I/O modules, eliminating field calibration steps during commissioning and replacement.
• Deterministic alarm response: The DC-coupled output path from probe to monitor ensures that shaft displacement events are captured without phase lag introduced by AC-coupling filters, preserving the sub-millisecond trip response required by API 670 Section 5.4.
• Dual-plane vibration measurement support: Two 31000-16-10-00-085-03-02 probes mounted at 90° (X-Y configuration) provide full orbital plot data for shaft centerline analysis, enabling differentiation between unbalance, misalignment, and rub conditions.
• Axial position monitoring capability: When paired with a 3500/25 Keyphasor® module, the same probe model supports thrust position measurement on axial-facing targets, reducing the number of distinct spare part types required in a plant inventory.
• DCS integration via standard analog output: The Proximitor® driver’s –24 VDC output is conditioned by the 3500 rack to 4–20 mA or ±10 V, compatible with Emerson DeltaV, Honeywell Experion, ABB 800xA, and Siemens PCS 7 analog input cards without signal conditioning hardware.
• Online diagnostics transparency: The 3500 monitor continuously checks for open-circuit (probe gap too large) and short-circuit (probe gap too small) conditions on the probe cable, generating Not OK (NOK) relay outputs and System 1® software alerts without interrupting the measurement channel.
• Hot-swap replacement without process shutdown: The threaded housing design allows probe replacement during planned maintenance windows without removing the bearing housing, provided the machine is at rest. The standardized gap setting (nominal 1.0 mm for steel targets) can be verified with a digital multimeter measuring bias voltage, requiring no specialized calibration equipment.
• Reduced spare parts complexity: The 31000 Series uses a common housing thread (5/8-18 UNF) across multiple cable length variants, meaning a single bracket design accommodates different SKU configurations. Plants can standardize on one bracket drawing while varying only the probe/cable assembly to match routing requirements.

Quality Assurance & Global Logistics

Every Bently Nevada 31000-16-10-00-085-03-02 unit supplied by siemensplc.com is sourced through verified industrial surplus and authorized distribution channels, with full part number and date code traceability. Pre-shipment inspection covers housing thread condition, cable sheath integrity, connector pin continuity, and label legibility against the Bently Nevada (Baker Hughes) official part number matrix.

Units are packed in anti-static foam-lined cartons with individual serial tracking documentation. For orders requiring certificates of conformance or material test reports, these are requested from the supply chain and provided at no additional charge for qualifying order quantities.

Logistics operations are based in Xiamen, China (Fujian Province), with direct access to Xiamen Gaoqi International Airport and Xiamen Port. Standard export shipments are dispatched via DHL Express (3–5 business days to Europe/North America), FedEx International Priority, or UPS Worldwide Expedited. Sea freight consolidation is available for bulk orders. All shipments include commercial invoice, packing list, and certificate of origin. EAR99 classification applies; no export license required for standard commercial destinations. In-stock units ship within 2 business days of payment confirmation.

Contact Information

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