The Bently Nevada 21000-28-05-15-028-04-02, also cataloged as the 21000 Series Proximity Probe Housing, operates as a dedicated mechanical hardware component for secure transducer mounting and environmental protection within rotating machinery turbine monitoring (TSI) platforms.

Suffix Breakdown & Model Matrix

The 21000-28-05-15-028-04-02 follows the standard Bently Nevada probe housing configuration nomenclature:

• 21000: Proximity probe housing series.

• 28: Probe diameter (8 mm).

• 05: Mounting thread specification (e.g., 3/4-14 NPT).

• 15: Extension piece length/configuration.

• 028: Overall housing length (280 mm).

• 04: Conduit fitting type.

• 02: Material and coating option.

Hardware Specifications

Mechanical Mounting and Structural Integrity

This housing assembly provides the rigid interface required for accurate displacement measurement by isolating the probe from structural vibrations. Proper installation is critical to prevent mechanical resonance, which can introduce noise into the vibration monitoring circuit. The housing is designed to maintain a consistent gap setting between the probe tip and the shaft target, ensuring the transducer remains within its linear measurement range. The assembly also serves as a protective conduit for the probe's coaxial cable, shielding it from debris, oil mist, and mechanical impact in harsh industrial environments.

Ordering info

• One (1) 21000-28-05-15-028-04-02 Proximity Probe Housing.

• Mounting nut and O-ring seal kit.

• Technical installation and assembly documentation.

• Note: Confirm the thread compatibility with the machine casing to ensure a pressure-tight seal if required.

Field Installation Guidelines

• Mechanical Interface: Thread the housing into the machine port using appropriate thread sealant (e.g., Teflon tape or pipe compound) to achieve a positive, leak-free seal.

• Alignment: Ensure the housing is installed perpendicular to the shaft centerline; verify that the probe can be fully inserted and adjusted within the housing.

• Cable Routing: Use the integrated conduit fitting to secure the probe's coaxial cable; maintain a gentle bend radius to avoid damaging the cable's internal shielding.

• Grounding: The housing body must establish a low-impedance connection to the machine ground to maintain the shielding integrity of the proximity transducer system.

• Locking: Once the optimal probe gap is established, tighten the jam nuts to secure the housing assembly against vibration-induced loosening.

Frequently Asked Questions

• What is the purpose of the 21000 series housing?

  The 21000 series provides a robust, standardized mechanical interface for mounting proximity probes while protecting the probe body and cable from the machine environment.

• Is the housing compatible with all 8 mm probes?

  The housing is designed specifically for 8 mm probe diameters; verify that your probe thread pitch matches the internal threads of the housing.

• How is the thread seal maintained?

  The housing utilizes standard NPT threads; apply appropriate industrial thread sealant to ensure a pressure-tight seal if the installation is in a pressurized oil cavity.

• Can the housing be used in high-temperature zones?

  Yes. The housing is rated for temperatures up to +177 deg C; ensure the sealant used is also rated for the operating temperature of the machine.

• How is mechanical resonance avoided?

  Proper installation involves threading the housing deeply into the machine casing to minimize "stick-out," reducing the lever arm effect that causes vibration-induced noise.

• Is the housing material resistant to corrosion?

  The stainless steel construction provides high resistance to oxidation and chemical exposure typically found in turbine lubrication systems.

• How do I confirm the housing length is correct for my application?

  The 280 mm length is measured from the mounting flange to the conduit fitting; ensure this fits within the physical space constraints of your machine casing.

• What should I do if the conduit fitting is damaged?

  The conduit fitting is an integral part of the housing assembly; if damaged, the integrity of the cable shielding may be compromised, necessitating an assembly replacement.