The Bently Nevada 21000-34-10-20-058-04-02, 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 configuration parameters:

• 21000: Base housing series

• 34: Mounting thread and material configuration

• 10: Probe orientation style

• 20: Mounting thread size

• 058: Housing length identifier

• 04: Connection interface configuration

• 02: Agency approval and seal variant

Hardware Specifications

TSI Mechanical Monitoring and Signal Integrity

The housing provides the rigid structural support required for accurate eddy-current probe scaling. By maintaining a fixed distance between the probe tip and the target shaft, the assembly ensures the system maintains a stable gap voltage, typically targeting -10 VDC at the linear range center. Proper installation is critical to prevent mechanical resonance from affecting rotor dynamics data. Furthermore, the housing supports effective cross-talk suppression by providing a robust, grounded mounting interface, which minimizes electromagnetic interference and ensures the fidelity of displacement signals during high-speed machine operation.

Ordering Info

• 1 x 21000-34-10-20-058-04-02 Proximity Probe Housing

• 1 x Locking nut assembly

• 1 x O-ring sealing kit

• 1 x Technical installation datasheet

Field Installation Guidelines

• Surface Preparation: Ensure the mounting surface is clean and free of debris to provide a flat, stable base for the housing.

• Thread Engagement: Utilize compatible thread sealant on NPT sections to prevent leakage if the housing enters a pressurized lubrication zone.

• Torque Application: Tighten the locking nut to the specified torque limit to prevent housing rotation during thermal expansion of the machine casing.

• Grounding: Verify that the housing is bonded to the machine case to maintain an effective ground path for the cable shield.

Frequently Asked Questions

• Can this housing be used in high-pressure oil environments? Yes, provided the internal O-ring seal is properly seated and the threads are correctly sealed.

• Is the housing material chemically resistant? The stainless steel construction is designed for compatibility with standard turbine and compressor lubricants.

• How is the probe depth adjusted? Adjust the probe position within the housing bore before tightening the locking nut to secure the gap.

• Can I reuse the housing after removal? Yes, if the threads and sealing surfaces show no signs of mechanical deformation or corrosion.

• Does the housing affect signal frequency? No, the housing is a passive component; however, loose mounting can introduce mechanical noise.

• How do I identify the correct mounting orientation? The housing design dictates the probe angle; verify the orientation matches the machinery monitoring requirements.

• Are the locking nuts replaceable? Standard replacements are available, but ensure the thread pitch matches the 21000 series housing.

• What is the purpose of the conduit interface? The rear thread allows for the connection of flexible metal conduit to protect the probe cable from environmental damage.