Configured for transducer positioning in machine monitoring systems, the Bently Nevada 21000-16-05-15-098-03-02 (21000-16-05-15-098-03-02 Proximity Probe Housing Assembly) provides direct physical execution for housing eddy-current probes in industrial rotating machinery.

Suffix Breakdown and Model Matrix

• 21000: Base Model (Proximity Probe Housing Assembly)
• 16: 3300 XL 8 mm probe compatibility
• 05: 0.5 m (20 in) probe length
• 15: Minimum length 1.5 in (38 mm)
• 098: Housing case length designator
• 03: Hardware accessory set (3/4-14 NPT plug, 3/4-14 to 1/2-14 NPT reducer, cable seal grip)
• 02: 3/4-14 NPT process connection thread

Hardware Specifications

Eddy-Current Probe and Signal Integrity

The housing assembly is instrumental in maintaining proper eddy-current probe scaling within the machine housing. During installation, the probe must be positioned to allow for precise gap voltage validation against the standard -10 VDC targets. This housing assembly provides a stable mechanical platform that minimizes vibration-induced noise and ensures effective cross-talk suppression by isolating the probe signal from mechanical chassis resonance. Correct alignment within the assembly is required to maintain the accuracy of rotor dynamics data captured by the proximity transducer system.

Ordering Information

• 1 x 21000-16-05-15-098-03-02 Probe 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 assembly (including 3 sets of grommets for 1/8-3/16, 1/4-5/16, and 5/16-3/8 inch cable diameters)

Installation Guidelines

• Process Connection: Ensure a minimum engagement of 5 full NPT threads when installing the housing into the machine port to maintain structural integrity and pressure containment.
• Cable Sealing: Select the appropriate grommet from the provided kit to match the probe cable diameter. Tighten the seal grip nut to compress the grommet around the cable jacket, ensuring an environmental seal.
• Probe Adjustment: Calibrate the probe gap as required by the specific vibration monitoring system before final tightening of the probe locknut.
• Thread Lubrication: Apply an appropriate anti-seize compound to all NPT threads to prevent galling, especially in stainless steel housing applications.

Frequently Asked Questions

• Is this housing suitable for high-pressure machine applications?

  The housing is designed for industrial machine casings; however, always verify the pressure rating of the NPT joint and the machine port capability before installation.

• How is the probe held in place inside the housing?

  The housing features an internal locknut or collet mechanism that secures the probe at the desired insertion depth once the gap is correctly set.

• Can I replace the cable seal grip in the field?

  Yes, the cable seal grip is a standard component that can be replaced if the grommets or body become damaged, provided the replacement matches the NPT thread size.

• What is the purpose of the 1.5 inch minimum length?

  This specification indicates the minimum insertion depth or housing segment required to ensure the probe tip is correctly positioned relative to the shaft.

• How do I ensure proper grounding?

  The housing should be electrically continuous with the machine casing to provide a stable common ground reference for the eddy-current probe system.

• What should be done if the probe cable is too thick for the grommets?

  Do not force the cable. Ensure you are using the correct grommet size or consult the manufacturer for an alternative seal grip assembly compatible with the cable OD.

• Can this assembly be used with non-XL probes?

  The 21000-16 series is designed for 3300 XL 8 mm probes. Using other probe types may cause mechanical fit issues or signal inaccuracy.

• How often should the installation be checked?

  Installation integrity, including thread tightness and seal grip compression, should be inspected during scheduled machine outages.