Configured for precise transducer positioning in mechanical monitoring systems, the Bently Nevada 21000-16-05-00-094-03-02 (21000-16-05-00-094-03-02 Proximity Probe Housing Assembly) provides direct physical execution for housing eddy-current probes in industrial machinery.

Model Configuration Matrix

• 21000: Base Model (Proximity Probe Housing Assembly)
• 16: 3300 XL 8 mm probe configuration
• 05: 0.5 m (20 in) probe length
• 00: Unspecified/Not Required
• 094: Probe case length (in increments of 0.1 in)
• 03: Hardware accessory set (3/4-14 NPT plug, 1/2-14 NPT reducer, cable seal grip)
• 02: 3/4-14 NPT mounting thread

Hardware Specifications

Mechanical Monitoring and Transducer Alignment

This housing assembly acts as the mechanical interface for eddy-current probe scaling. Precise depth adjustment within the machine case is necessary to maintain the gap voltage validation within the target -10 VDC range for 3300 XL systems. Proper installation ensures stable rotor dynamics measurements and prevents potential signal interference or cross-talk suppression failures caused by mechanical resonance of the probe mount itself. Ensuring the probe tip is centered and secured is foundational to maintaining signal linearity.

Ordering Information

• 1 x 21000-16-05-00-094-03-02 Housing Assembly
• 1 x 3/4-14 NPT Plug
• 1 x 3/4-14 to 1/2-14 NPT Reducer
• 1 x Cable seal grip kit (includes grommets for 1/8-3/16, 1/4-5/16, and 5/16-3/8 inch cables)

Field Installation Guidelines

• NPT Engagement: Use a minimum of 5 full threads engagement for all NPT connections to ensure pressure containment and mechanical integrity. Apply compatible thread sealant.
• Torque Application: Tighten the housing into the machine case using standard pipe wrenches. Do not apply torque to the probe connector interface.
• Cable Gland Setup: Select the correct grommet size from the provided kit to match the proximity probe cable diameter. Ensure the compression nut is tightened sufficiently to provide environmental sealing.
• Probe Depth: Adjust the probe insertion depth according to the specific machine monitor requirements, ensuring the probe remains locked in position after setting the gap.

Frequently Asked Questions

• Can I use a different probe type with this housing?

  This housing is optimized for 3300 XL 8 mm probes. Using non-specified probes may compromise mechanical fit or electrical signal linearity.

• What is the purpose of the included reducer?

  The 3/4 to 1/2 NPT reducer allows for interface with varying conduit or cable protection entry points common in industrial site piping.

• How is the probe held in place?

  The housing utilizes an internal locking mechanism (often a collet or locknut arrangement) to fix the probe insertion depth once the gap is calibrated.

• Is the housing pressure-rated?

  The housing is designed to withstand the pressures inherent in machine case applications; however, ensure the NPT joints are sealed correctly.

• Does the cable seal grip provide strain relief?

  Yes, the cable seal grip with grommets acts as both an environmental seal and a strain relief for the probe coaxial cable.

• Can I shorten the probe case length in the field?

  The case length is factory-specified (094). Field modification of the case length is not recommended as it may affect structural integrity.

• What should I do if the NPT threads show signs of galling?

  Use a proper anti-seize lubricant compatible with the housing material to prevent galling during installation.

• How often should I check the probe gap?

  The gap should be verified during commissioning and periodically during machine maintenance to ensure it remains within the linear range.