The Bently Nevada 21000-28-05-00-061-03-02 (21000-28-05-00-061-03-02 Proximity Probe Housing Assemblies) operates as a dedicated hardware component for mechanical transducer protection and gap-setting adjustment within Turbine Supervisory Instrumentation (TSI) platforms.

Suffix Breakdown & Model Matrix

• 21000: Standard proximity probe housing series.

• 28: 8 mm probe compatibility.

• 05: 3/4-14 NPT machine mounting thread.

• 00: Standard configuration (no intermediate extension).

• 061: 61 mm total housing assembly length.

• 03: 1/2-14 NPT conduit interface.

• 02: High-temperature/chemical resistant material specification.

Hardware Specifications

Mechanical TSI Integration

The 21000 series housing provides the physical foundation for accurate eddy-current probe scaling. By ensuring a rigid, low-deflection interface between the machine casing and the transducer, the housing eliminates signal noise caused by mechanical resonance. This assembly is engineered to maintain the probe's calibrated position, ensuring the transducer maintains the specified gap voltage (typically centered at -10 VDC) required for linear shaft displacement monitoring. Robust construction mitigates cross-talk suppression issues in high-density mounting arrays.

Ordering Information

• One (1) 21000-28-05-00-061-03-02 housing assembly.

• Standard lock nut and jam nut hardware.

• O-ring seal kit for pressure-tight installation.

• Note: Confirm machine port depth compatibility to ensure the 61 mm length meets specific probe stick-out requirements.

Installation Guidelines

• Port Preparation: Clean the machine port thoroughly to remove residual sealants or metal debris that could compromise the pressure-tight seal.

• Alignment: Ensure the housing is perpendicular to the shaft centerline; verify that the probe tip can be adjusted to the required gap distance without obstruction.

• Depth Setting: Utilize a depth micrometer to set the gap; tighten the jam nuts only after the required gap voltage is confirmed at the monitor input test pin.

• Grounding: Secure the stainless steel housing to the machine chassis to provide a low-impedance ground path for the transducer's electromagnetic shielding.

• Conduit Management: Secure protective conduit within the 1/2-14 NPT fitting; avoid sharp bend radii that could introduce mechanical stress on the coaxial cable shield.

Frequently Asked Questions

• Can this housing be used for radial vibration monitoring?

  Yes, it is designed for standard proximity probes used in radial vibration, axial position, and speed monitoring applications on industrial turbomachinery.

• What is the impact of housing resonance on signal accuracy?

  Mechanical resonance or loose housing can introduce false vibration data; a rigid, properly locked installation is required to ensure signal fidelity.

• Is the housing material resistant to turbine oil?

  Yes, the 300-series stainless steel is chemically compatible with most standard turbine, synthetic, and hydraulic oils.

• How is the conduit fitting utilized?

  The integrated fitting secures the protective conduit, shielding the transducer cable from environmental impact, oil mist, and physical damage.

• Does this assembly include the proximity probe?

  No, this is a mechanical housing assembly; the proximity transducer and extension cable are ordered separately.

• Can the housing be used in high-pressure oil cavities?

  Yes, provided the 3/4-14 NPT threads are installed with a suitable high-pressure rated sealant or thread compound.

• How do I confirm the 61 mm length requirement?

  Confirm the port depth and required probe stick-out distance; 61 mm is the total length from the mounting thread to the conduit interface.

• Is the housing grounding requirement critical?

  Yes, maintaining a low-impedance ground path is a requirement to minimize RFI/EMI interference on the sensitive eddy-current signal.