Bently Nevada 21000-16-10-15-119-03-02 Proximity Probe Housing – 3300 XL Series

Bently Nevada 21000-16-10-15-119-03-02 – Precision Housing Assembly for 3300 XL Eddy Current Proximity Systems

The 21000-16-10-15-119-03-02 is a factory-configured proximity probe housing assembly manufactured by Bently Nevada (Baker Hughes) for integration within the 3300 XL Proximity Transducer System. Its function is singular and non-negotiable: to maintain the mechanical and geometric integrity of the eddy current probe installation at the point of measurement — the air gap between probe tip and rotating shaft. In turbomachinery protection architectures, this gap is the physical origin of every vibration and position data point fed into the protection rack. Any deviation in housing alignment, thread engagement, or sealing integrity directly corrupts the transducer output and, by extension, the machinery protection decision logic.

This part number encodes a specific configuration: probe body diameter (16 mm class), cable length designation (10 ft / ~3 m), thread form and pitch (15 series), connector type (119), and housing material/finish variant (03-02). Each segment of the part number is a dimensional or material constraint — substituting an adjacent part number without engineering verification is not a valid field practice. The 21000 series housing assemblies are designed exclusively for the 3300 XL 8 mm eddy current probe family and are incompatible with the earlier 3300 5 mm or the 3300 NSv series without adapter hardware.

Deployed across gas turbines, centrifugal compressors, steam turbines, and large motor-driven rotating equipment in oil & gas, power generation, and petrochemical facilities, this housing assembly is a maintenance-critical spare. Its replacement is typically triggered by thread damage, housing corrosion, seal failure, or scheduled overhaul intervals. Because the 3300 XL system is a continuous, online monitoring platform — not a periodic measurement tool — housing integrity must be maintained without interruption to the protection function.

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Technical Parameters

Hardware Logical Analysis

The eddy current proximity transducer system operates on a straightforward electromagnetic principle: a high-frequency oscillator (typically 1.0 MHz for the 3300 XL driver) drives an RF signal through the probe coil, generating an alternating magnetic field at the probe tip. When a conductive target — the shaft — enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing the signal amplitude. The Proximitor sensor converts this amplitude change into a DC voltage output, linearly proportional to the probe-to-target gap over the calibrated range (typically 0.25 mm to 2.25 mm for 8 mm probes).

The housing assembly’s mechanical role in this signal chain is more critical than it appears. The probe tip must be positioned at a precise standoff distance from the shaft surface — typically set at the midpoint of the linear range, approximately 1.0–1.27 mm (40–50 mil) for standard 8 mm probes. The housing provides the threaded bore and locknut interface that holds this gap setting against continuous vibration, thermal cycling, and process pressure differentials. Thread engagement depth and pitch accuracy directly determine whether the gap setting drifts over time. The 21000 series housing uses a fine-pitch thread form that minimizes axial movement per degree of rotation, providing stable gap retention under dynamic loading.

EMC performance is addressed through the coaxial cable architecture and the housing’s conductive body. The shield of the coaxial extension cable is terminated at the housing connector, providing a continuous ground reference from the Proximitor sensor back to the probe body. This shielding architecture attenuates common-mode noise pickup along the cable run — a significant concern in switchgear rooms and motor control centers where high-frequency switching transients are present. The housing body itself, being conductive stainless steel, acts as a Faraday enclosure for the probe coil assembly, reducing capacitive coupling from adjacent conductors.

Thermal expansion management is embedded in the housing geometry. The stainless steel body has a coefficient of thermal expansion (CTE) closely matched to the probe body material, minimizing differential expansion that would otherwise shift the probe tip position relative to the housing face. In high-temperature applications — steam turbine bearing housings operating above 120 °C — this CTE matching is the primary mechanism preventing gap drift between cold startup and full operating temperature.

System Integration Benefits

• Direct API 670 Compliance Path: The 21000-16-10-15-119-03-02 is an OEM-specified component within the 3300 XL system, which is independently certified for API 670 machinery protection applications. Using the correct housing part number preserves the system’s compliance status without requiring re-certification of the transducer chain.
• Zero-Recalibration Replacement: Because the housing geometry is dimensionally identical to the original installation, replacing a failed housing with the same part number does not require re-gapping the probe or recalibrating the Proximitor sensor — provided the probe and extension cable are undamaged. This reduces planned maintenance downtime to the mechanical replacement interval only.
• Deterministic Signal Latency: The 3300 XL system, when properly housed, delivers a transducer response time of less than 1 ms for gap changes within the linear range. The housing’s rigid mechanical interface ensures the probe tip position is stable to within ±0.01 mm under normal vibration loading, preserving the system’s ability to detect shaft events at frequencies up to 10 kHz.
• Diagnostic Transparency via Gap Voltage: The DC output of the Proximitor sensor provides a continuous, real-time indication of the probe-to-target gap. A housing that maintains gap stability allows the 3500 rack’s gap alarm channels to function as a housing integrity monitor — a gap voltage outside the normal operating band indicates housing movement, probe damage, or target surface anomaly, all distinguishable by the direction and rate of the gap shift.
• Compatibility with Bently Nevada System 1 Software: The transducer chain anchored by this housing feeds data into System 1 condition monitoring software via the 3500 rack. Stable housing geometry ensures that System 1’s trend analysis and alarm setpoint logic operates on physically meaningful data, not measurement artifacts introduced by housing instability.
• Multi-Plane Monitoring Support: A single rotating machine may have 8–16 proximity probe installations across radial and axial measurement planes. The 21000 series housing is available in multiple configurations to cover all measurement planes, allowing a single spare part strategy to cover the entire machine train when the correct part numbers are stocked.
• Reduced Spare Parts Inventory Complexity: The 21000 series part numbering system is fully documented in Bently Nevada’s technical manuals, allowing maintenance engineers to cross-reference installed part numbers directly from the machine’s instrumentation drawings. This eliminates ambiguity in spare parts procurement and reduces the risk of ordering an incompatible housing variant.
• Long-Term OEM Supply Chain: Bently Nevada (Baker Hughes) maintains production of the 3300 XL system components as a long-lifecycle industrial product line. The 21000 series housing assemblies are available through authorized distributors and specialist industrial automation suppliers, ensuring supply continuity for plants with 20–30 year equipment lifecycles.

Quality Assurance & Global Logistics

Every unit of the Bently Nevada 21000-16-10-15-119-03-02 supplied through siemensplc.com is sourced as genuine OEM product — manufactured by Bently Nevada (Baker Hughes) to the original production specification. We do not supply rebranded, counterfeit, or dimensionally modified housings. Each unit is inspected prior to shipment for thread integrity, connector condition, cable jacket continuity, and housing body surface condition. Units showing evidence of prior installation, thread damage, or connector corrosion are rejected and not offered for sale.

Packaging follows anti-static and moisture-barrier protocols appropriate for precision instrumentation. Each housing assembly is individually bagged, cushioned, and labeled with the full part number and serial number (where available) for traceability. Export documentation — commercial invoice, packing list, and certificate of origin — is prepared for every international shipment. Additional documentation including material certificates and test records is available upon request for regulated industries.

Logistics operations are based in Xiamen, China, with established freight forwarding relationships covering DHL Express, FedEx International Priority, and sea freight consolidation for bulk orders. Typical transit times to Southeast Asia are 3–5 business days by air; to Europe and North America, 5–8 business days by express courier. For time-critical plant shutdowns, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST. All shipments are tracked end-to-end, with tracking numbers provided within 24 hours of dispatch.

Contact Information

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