The Bently Nevada 21000-27-05-40-026-03-02, also cataloged as the 21000 Proximity Probe Housing, operates as a dedicated hardware component for the mechanical positioning and environmental protection of eddy-current transducers within rotating machinery monitoring systems.

Model Suffix Breakdown

The part number defines specific mechanical and physical configuration parameters:

• 21000: Base housing series

• 27: Material and thread configuration

• 05: Probe orientation style

• 40: Mounting thread size

• 026: Housing length identifier

• 03: Connection interface type

• 02: Agency compliance and seal configuration

Hardware Specifications

TSI Mechanical Monitoring and Signal Integrity

The structural integrity of this housing assembly is critical for maintaining accurate eddy-current probe scaling. By securing the probe in a fixed orientation relative to the shaft, the housing ensures that gap voltage validation remains stable, targeting the standard -10 VDC at the linear range center. Proper installation prevents mechanical noise from contaminating the vibration signals. Furthermore, the housing configuration supports cross-talk suppression by providing a robust, grounded mounting point, which is essential for preserving signal-to-noise ratios in demanding rotor dynamics monitoring applications.

Ordering Info

• 1 x 21000-27-05-40-026-03-02 Proximity Probe Housing

• 1 x Locking nut assembly

• 1 x Environmental seal kit

• 1 x Technical installation manual

Field Installation Guidelines

• Thread Preparation: Clean all mounting threads and apply industrial-grade sealant to prevent leakage if installed in a pressurized lubrication zone.

• Torque Limits: Apply firm pressure to the locking nut to ensure the probe remains stationary during operation; do not exceed structural torque limits.

• Grounding Path: Verify electrical continuity between the housing and the machine casing if an auxiliary ground path is required for shielding.

• Alignment: Ensure the probe tip is centered within the bore to prevent contact with the target during high-speed shaft thermal expansion.

Frequently Asked Questions

• Can this housing be installed in any orientation? Yes, provided the probe tip remains within the linear sensing range of the target shaft.

• Is the housing thread compatible with all probes? The thread must match the specific probe model; verify the compatibility of the probe series before insertion.

• How is the O-ring used? The seal is positioned to prevent environmental contaminants or machine fluids from entering the monitoring area.

• Can I reuse the housing? Yes, provided the threads are free of galling and the sealing surfaces are undamaged after removal.

• Does this housing impact frequency response? No, it acts as a passive mount; however, poor installation that leads to mechanical resonance can degrade signal quality.

• What is the chemical compatibility of the housing? Stainless steel construction is compatible with most standard petroleum-based lubricating oils and greases.

• How do I prevent housing rotation? Use the locking nut to secure the housing body against the machine casing boss.

• Is the housing depth adjustable? The total length is fixed; probe depth is adjusted by moving the probe within the housing bore before locking.