Bently Nevada 31000-28-10-00-026-00-02 Proximity Probe Housing Assembly – 3300 XL Series

Bently Nevada 31000-28-10-00-026-00-02 — Structural Anchor of Eddy-Current Measurement Chains in Turbomachinery Protection

The Bently Nevada 31000-28-10-00-026-00-02 is a factory-configured proximity probe housing assembly engineered for the 3300 XL Proximity Transducer System — Bently Nevada’s precision eddy-current platform deployed across gas turbines, steam turbines, centrifugal compressors, and high-speed rotating machinery in power generation, oil & gas, and petrochemical processing. This part number is not a generic housing; it encodes a specific combination of probe tip diameter (8 mm), integral cable length, thread geometry, and mounting configuration that defines its mechanical and electrical interface within a calibrated transducer chain.

In continuous machinery protection applications, the housing assembly performs a function that is frequently underestimated: it maintains the absolute spatial relationship between the eddy-current probe tip and the rotating target surface. Any deviation in probe-to-target gap — even sub-millimeter — shifts the operating point on the proximitor’s linear output curve, introducing a DC offset error that propagates directly into the vibration and position signals fed to the Bently Nevada 3500 Series Machinery Protection System. The 31000-28-10-00-026-00-02 eliminates this variable by providing OEM-dimensioned thread pitch, locking geometry, and tip-to-shoulder standoff distance that are traceable to the original calibration dataset.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 3300 XL proximity probe operates on the Lenz’s Law induction principle: a high-frequency oscillator (typically 200 kHz carrier) drives the probe coil, generating an alternating magnetic field. When a conductive target enters the field, eddy currents are induced on the target surface, loading the coil and reducing its effective inductance and Q-factor. The proximitor circuit converts this impedance change into a DC voltage output, nominally –200 mV/mil (–7.87 V/mm) for the 8 mm probe configuration.

The housing assembly’s mechanical precision directly governs two critical parameters: linear range and scale factor stability. The 3300 XL 8 mm probe has a published linear range of approximately 0.25 mm to 2.54 mm (10 to 100 mil) gap. The housing’s thread pitch and shoulder geometry position the probe tip at the factory-set nominal gap when installed to the specified torque value, placing the operating point at the center of the linear range — maximizing dynamic headroom for both radial vibration amplitude and DC gap measurement.

From an EMC standpoint, the stainless steel housing body provides a continuous conductive shield around the probe coil assembly, attenuating capacitively coupled interference from adjacent high-voltage cabling and motor drives. The integral cable construction eliminates the connector junction between probe and extension cable at the measurement point — a common source of intermittent signal degradation in high-vibration environments where threaded connectors are subject to fretting corrosion. The cable’s coaxial geometry maintains a controlled characteristic impedance matched to the proximitor input, preventing reflections that would appear as spurious high-frequency noise on the vibration channel.

The locking mechanism on the housing thread is a critical detail for long-term measurement stability. In turbomachinery installations, probe housings are subject to continuous broadband vibration energy. Without a positive locking feature, thread backlash allows the probe to migrate axially over time, producing a slow DC drift in the gap voltage that mimics rotor thermal growth — a diagnostic ambiguity that can mask genuine axial position changes or trigger false alarm conditions on thrust bearing monitors.

System Integration Benefits

• Direct 3500 Series Compatibility: The 31000-28-10-00-026-00-02 interfaces without signal conditioning modification to Bently Nevada 3500/40M, 3500/42M, and 3500/46M monitor modules, preserving the factory scale factor and alarm setpoint calibration stored in the rack configuration.
• Matched-Set Calibration Traceability: As an OEM component, this housing is manufactured to the dimensional tolerances that underpin the published ±1% scale factor accuracy of the 3300 XL system — a specification that aftermarket housings cannot guarantee without independent calibration.
• Deterministic Alarm Response: Maintaining calibrated gap geometry ensures that vibration amplitude alarms (Alert and Danger setpoints) trigger at the correct physical displacement values, supporting API 670 Table 1 alarm level requirements without field recalibration after housing replacement.
• Diagnostic Transparency: Accurate DC gap voltage output enables the 3500 system’s gap OK/not OK diagnostic to function correctly, providing operators with a real-time indication of probe installation integrity rather than a silent measurement failure.
• Reduced Maintenance Cycle Disruption: The repeatable thread-and-lock installation geometry allows maintenance technicians to replace the housing and restore the probe gap to within ±0.05 mm of the original setting without requiring a full system recalibration outage.
• Hazardous Area Deployment: The housing’s sealed construction and OEM certification support installation in Zone 1/Zone 2 hazardous areas when used with appropriate Zener barriers or galvanic isolators, maintaining ATEX/IECEx system compliance.
• Multi-Plane Monitoring Scalability: Standardized housing geometry across the 3300 XL family allows plant engineers to maintain a single spare part number for X-Y radial vibration probe pairs, reducing spare parts inventory complexity in multi-train installations.
• Long-Term Data Baseline Integrity: Consistent probe positioning across maintenance intervals preserves the historical vibration trend database, enabling meaningful comparison of current machinery condition against baseline data collected years earlier — a prerequisite for condition-based maintenance programs.

Quality Assurance & Global Logistics

Every Bently Nevada 31000-28-10-00-026-00-02 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment inspection protocol. Physical inspection covers probe tip surface condition, cable jacket integrity, connector thread engagement, and housing body dimensional check against OEM reference. Units sourced as new or surplus-new are verified against original OEM packaging and part label markings. Refurbished units are tested for coil continuity, insulation resistance, and cable shield integrity before release.

Packaging is engineered for international transit: the probe tip is protected by a machined plastic cap, the cable is coiled to the manufacturer’s minimum bend radius specification, and the assembly is secured in anti-static foam within a double-wall carton. Moisture-barrier desiccant is included for sea freight shipments.

Logistics from Xiamen cover all major global destinations. DHL Express, FedEx International Priority, and UPS Worldwide Express are available for time-critical orders, with typical transit times of 3–5 business days to Europe, North America, and the Middle East. Sea freight consolidation is available for bulk orders. Full export documentation — commercial invoice, packing list, certificate of origin, and material safety data where applicable — is prepared for every shipment. All units carry a 12-month warranty against manufacturing defects from the date of shipment.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.

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