21000-28-05-00-061-03-02 | Bently Nevada | Proximity Probe HousingAssemblies

Technical Overview

The Bently Nevada 21000-28-05-00-061-03-02 is a proximity probe housing assembly designed for integration into the Bently Nevada 3500 Machinery Protection System (MPS). It mechanically secures and electrically interfaces a 3300 or 3300 XL series proximity probe to the 3500 rack-mounted monitor modules. The assembly processes high-frequency eddy-current signals, maintains cable shielding integrity, and routes low-noise analog voltage outputs (−2 VDC to −18 VDC) directly to the 3500 system’s input terminals. It protects the backplane bus by isolating probe cabling from electromagnetic interference (EMI) through continuous 360° shield termination and grounded stainless-steel housing. This component does not process logic or communicate on digital buses—it serves strictly as a passive, calibrated mechanical and electrical interface between rotating machinery and the 3500 system architecture.

Detailed Specifications

Operational Capabilities

This housing assembly operates in high-vibration, high-EMI environments where signal fidelity is non-negotiable. In Oil & Gas, it mounts on compressor trains in offshore platforms—maintaining signal stability under 15 g RMS vibration per API 670. In Power Generation, it supports turbine monitoring in nuclear and combined-cycle plants, certified to G3 conformal coating (IPC-CC-830B) for humidity and salt fog resistance. In Aerospace test stands, it enables repeatable shaft displacement measurements during engine qualification runs at ambient temperatures up to 85 °C. No SIL rating applies: this is a passive mechanical interface, not a safety instrumented function. Hot-swap support is not applicable—installation occurs during system commissioning or maintenance outage.

Technical FAQ

Q1: Does the 21000-28-05-00-061-03-02 support legacy 3300 probes (pre-2005) and newer 3300 XL models?

Yes. The housing uses standard ½–20 UNF-2A threads and accepts both 3300 Series (e.g., 330104–00–00–00) and 3300 XL Series (e.g., 330780–00–00–00) probes. Cable exit orientation and sealing compression match Bently Nevada’s published dimensional drawings for all 3300-family probes. No adapter or modification required.

Q2: How do I ensure correct gap voltage calibration when installing this housing on a new bearing housing?

Verify probe extension cable length matches the system’s configured “cable compensation” setting in the 3500 rack (e.g., 0.5 m, 1.5 m, 5.0 m). Use only Bently Nevada-certified cables (e.g., 330130–00–00–00). Confirm housing depth per drawing 21000-28-05-00-061-03-02 Rev C: nominal thread engagement must be ≥0.250″ to maintain specified thermal expansion coefficient (12.5 µm/m·°C) and gap linearity.

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Meta Description: Genuine Bently Nevada 21000-28-05-00-061-03-02 Proximity Probe Housing Assemblies — in stock, 3300/3300 XL compatible, −40 °C to +85 °C rated.