Bently Nevada 21000-16-10-00-131-04-02 Proximity Probe Housing Assembly – 3300 Series

Bently Nevada 21000-16-10-00-131-04-02 — Eddy-Current Proximity Probe Housing Assembly for Continuous Shaft Displacement Measurement

The Bently Nevada 21000-16-10-00-131-04-02 is a threaded proximity probe housing assembly belonging to the 21000/3300 Proximity Transducer System — a field-proven eddy-current sensing platform engineered for continuous, non-contact measurement of radial shaft vibration, axial position, and differential expansion in critical rotating machinery. This assembly integrates the probe body, integral armored cable, and connector interface into a single mechanically robust unit, eliminating field-assembly variables that introduce measurement uncertainty in high-stakes turbomachinery protection loops.

In a typical API 670-compliant machinery protection architecture, the proximity probe housing assembly occupies the first node of the signal chain: it converts mechanical shaft displacement into a proportional DC voltage via the eddy-current effect, feeding the Proximitor® sensor driver, which in turn delivers a conditioned output to the 3500 Series rack monitor. The dimensional and electrical characteristics of the 21000-16-10-00-131-04-02 are factory-matched to the 3300 XL Proximitor® sensor, ensuring the linear range, sensitivity (nominally 7.87 V/mm at standard gap), and frequency response are within OEM-specified tolerances without field calibration adjustment.

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Technical Parameters

Hardware Logical Analysis

The eddy-current transduction mechanism in the 21000-16-10-00-131-04-02 operates on the principle of electromagnetic induction: a high-frequency oscillating magnetic field (typically 1–2 MHz carrier) is generated by the probe coil. When a conductive target enters the field, eddy currents are induced on the target surface, loading the coil and reducing its effective inductance. The Proximitor® driver circuit detects this impedance shift and converts it to a proportional DC output voltage. The relationship between gap distance and output voltage is linear within the specified range, with a slope of 7.87 V/mm — a value that remains stable across the full operating temperature envelope due to the temperature-compensated coil winding and matched cable impedance.

The 316 stainless steel housing provides both mechanical rigidity and electromagnetic shielding. The coaxial cable construction — with a braided shield bonded to the housing ground — suppresses common-mode noise pickup in environments with high electromagnetic interference (EMI) from variable-frequency drives, bus bars, and high-current motor leads. The shield continuity from probe tip to Proximitor® input is a critical design element: any shield discontinuity introduces a noise floor increase that can mask sub-mil shaft displacement events relevant to early bearing fault detection.

The factory-terminated integral cable eliminates the field-spliced connector joints that are a known failure mode in proximity transducer systems. Connector resistance drift at field-made joints — particularly in high-humidity or oil-mist environments — introduces a DC offset error that shifts the apparent gap reading without triggering a transducer fault alarm. The 21000-16-10-00-131-04-02 mitigates this by delivering a single, factory-qualified signal path from coil to rack input.

The probe tip geometry is optimized for a target diameter-to-probe-diameter ratio consistent with API 670 Annex D requirements, ensuring that shaft curvature does not introduce a nonlinearity error exceeding ±0.5% of full-scale output across the linear range. This is particularly relevant in small-bore compressor shafts where the target radius of curvature approaches the probe face diameter.

System Integration Benefits

• Direct 3300/3500 rack compatibility: Electrical characteristics are factory-matched to the 3300 XL Proximitor® sensor and 3500 Series monitor cards, eliminating the need for sensitivity re-scaling or custom alarm threshold recalculation at commissioning.
• Deterministic signal latency: The eddy-current output is a continuous analog DC signal with no sampling jitter, ensuring that the 3500 rack’s 20 ms voting logic receives a time-coherent input for each protection channel — a prerequisite for SIL 2 loop integrity under IEC 61511.
• Reduced commissioning time: Factory-calibrated sensitivity and pre-terminated cable mean the probe can be installed, gapped, and verified against the Proximitor® output in under 30 minutes using a standard gap-setting tool and a calibrated DC voltmeter.
• Dual-plane vibration measurement support: Two units installed at 90° (X-Y configuration) on a single bearing journal provide the orthogonal displacement data required for orbit plot generation in System 1® software, enabling shaft centerline analysis and bearing wear trending.
• High-temperature process compatibility: The –35°C to +177°C operating range covers steam turbine bearing housings, hot gas expanders, and fired heater fan bearings without requiring probe cooling provisions or derating of the sensitivity specification.
• EMC-hardened signal path: The coaxial shield architecture attenuates conducted and radiated interference to levels below the noise floor of the 3500 monitor’s A/D converter, preserving measurement resolution at the 0.001 mm level required for early-stage rotor instability detection.
• Corrosion-resistant housing for harsh environments: 316 stainless steel construction resists H₂S, chloride-bearing process fluids, and hydrocarbon condensates encountered in refinery and offshore platform installations, maintaining dimensional stability of the thread engagement over multi-year service intervals.
• Traceable manufacturing documentation: Each unit carries a factory serial number linked to production test records, enabling full material traceability for ASME PCC-2 repair documentation and insurance audit requirements at regulated facilities.

Quality Assurance & Global Logistics

Every 21000-16-10-00-131-04-02 unit stocked at siemensplc.com is sourced through authenticated supply channels and subjected to a structured incoming inspection protocol before entering inventory. Physical inspection covers housing thread integrity, cable jacket condition, connector pin alignment, and label authenticity against Bently Nevada OEM documentation. No refurbished, reconditioned, or grey-market units are accepted.

Shipments originate from our warehouse in Xiamen, China — a major export hub with direct access to international express freight networks. Standard dispatch lead time is 1–3 business days from order confirmation. Express air freight via DHL, FedEx, or UPS delivers to most industrial destinations in North America, Europe, the Middle East, and Southeast Asia within 3–7 business days. Sea freight consolidation is available for multi-unit procurement orders. Full export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration (8543.70 / 9031.80) — is provided with every shipment to support customs clearance at destination ports. A 12-month warranty covers manufacturing defects and verified OEM non-conformances from the date of shipment.

Contact Information

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