Configured for precision mechanical shaft vibration sensing in heavy industrial machinery, the Bently Nevada 330881-16-04-138-03-02 (330881-16-04-138-03-02 PROXPAC XL Proximity Transducer) provides direct physical/electrical execution.

Model Suffix Configuration Matrix

• Base Model: 330881
• Probe and Approvals Option: 16 (3300 XL 8 mm probe without approvals)
• Standoff Adapter Option: 04 (40 mm standoff adapter length)
• Probe Penetration Option: 138 (138 mm minimum penetration length)
• Fittings Option: 03 (One M20 conduit fitting and two sealing plugs)
• Mounting Thread Option: 02 (3/4-14 NPT process connection thread)

Hardware Specifications

Mechanical Monitoring and Rotor Dynamics Architecture

Engineered for rigorous machinery protection environments, this assembly relies on accurate eddy-current probe scaling to translate radial shaft displacement and axial position into precise voltage shifts. Gap voltage validation targets a nominal -10 VDC baseline at 1.27 mm gapping to maintain a linear operational range. Cross-talk suppression protocols dictate a minimum 40 mm axial or 38 mm radial separation between adjacent probe tips, preserving signal clarity during rotor dynamics evaluations.

Ordering Information

• 1 x 330881-16-04-138-03-02 PROXPAC XL assembly unit
• 1 x 40 mm standoff adapter
• 1 x M20 conduit fitting
• 2 x Threaded enclosure sealing plugs

Field Installation Guidelines

• Probe Gapping: Set the initial probe gap to 1.27 mm from the rotating target surface to center the output voltage within the linear operating curve.
• Conduit Sealing: Secure the M20 conduit fitting using appropriate thread sealant to maintain the IP66 and Type 4X environmental protection rating.
• Spatial Separation: Keep adjacent probe tips separated by at least 40 mm for axial layouts or 38 mm for radial layouts to avoid electromagnetic cross-talk.
• Enclosure Grounding: Fasten the polyphenylene sulfide housing securely to machine earth ground to dissipate static charge buildup safely.

Frequently Asked Questions

• What specific material is used for the PROXPAC XL housing construction?

  It is manufactured from Polyphenylene Sulfide thermoplastic infused with glass and conductive fibers for electrostatic dissipation and environmental strength.

• How does the 40 mm standoff adapter influence probe installation?

  It provides the required mechanical extension length to clear thermal insulation barriers and mounting bosses on machine casings.

• What is the target gapping value for the 8 mm probe system?

  The probe should be gapped at approximately 1.27 mm, yielding a nominal output voltage of -10 VDC.

• What conduit fitting is included with this specific part number configuration?

  The unit includes one metric M20 fitting alongside two threaded sealing plugs for unused port entries.

• Why is maintaining minimum probe separation important in multi-transducer setups?

  It prevents high-frequency electromagnetic interference and cross-talk between adjacent eddy-current fields.

• What is the primary function of the 138 mm penetration option?

  It defines the exact insertion depth of the probe tip assembly relative to the exterior housing mounting face.

• Does the transducer housing require an internal power supply connection?

  No, power is supplied remotely through the external proximitor circuit connected to the internal sensor module.

• What environmental protection rating does the assembled housing achieve?

  The enclosure meets Type 4X and IP66 criteria, ensuring resistance against heavy moisture, dust, and washdowns.