Description

The Bently Nevada 330104-00-04-10-02-CN is an unarmored 8 mm proximity probe from the 3300 XL series. It is designed for non-contacting shaft displacement, vibration monitoring, and phase reference (Keyphasor) applications.

This model features English 3/8-24 UNF mounting threads and carries specific hazardous area approvals for international deployment.

Suffix Breakdown & Model Matrix

The alphanumeric suffix combination defines the specific mechanical and electrical configurations of this hardware assembly:

• 330104: Base model for 3300 XL 8 mm proximity probe with 3/8-24 UNF thread, unarmored.
• 00: Unthreaded Length Option (00 = 0.0 inches).
• 04: Overall Case Length Option (04 = 4.0 inches).
• 10: Total Length Option (10 = 1.0 meter / 3.3 feet).
• 02: Connector and Cable-Type Option (02 = Miniature coaxial ClickLoc connector, standard coaxial cable).
• CN: Agency Approval Option (CN = ATEX, IECEx, and Chinese NEPSI hazardous area marking).

Hardware Specifications

Eddy-Current Probe Scaling & Rotor Dynamics

During operation, high-frequency RF fields generated by the Proximitor loop penetrate the target surface. Consequently, accurate calibration requires an exact eddy-current probe scaling profile that matches the metallurgy of the shaft. To establish a stable operating baseline for rotor dynamics tracking, field engineers must validate that the gap voltage achieves a target value of -10 VDC at the geometric center of the linear zone. Furthermore, tight winding geometries optimize cross-talk suppression, thereby preventing electromagnetic interference between adjacent multi-axis probes installed within the same bearing housing block.

Frequently Asked Questions

Q: What certification mandate does the -CN suffix fulfill?

A: The -CN suffix option certifies the proximity probe for deployment within hazardous environments requiring country-specific localized approvals, combining global ATEX/IECEx standards with regional Chinese NEPSI explosive atmosphere compliance.

Q: Can this probe be swapped directly with a 330103 model?

A: Electrically and functionally, yes—they use the same 8 mm tip and 3300 XL electronics. However, mechanically they are incompatible without modifications because the 330103 utilizes an M10x1 metric thread, while this 330104 model utilizes a 3/8-24 UNF English thread.

Field Installation Guidelines

• Mechanical Clearance: Maintain a minimum counterbore clearance of 2 or more probe tip diameters (16 mm or 0.63 inches minimum) to avoid side-loading errors from surrounding metal structures.
• Torque Limits: When installing the 3/8-24 UNF threaded case into the mounting bracket, do not exceed the maximum allowable tightening torque of 16.3 N·m (144 in·lb).
• Connector Integrity: Ensure the miniature coaxial ClickLoc connector faces remain completely free of moisture and particulate matter. Subsequently, twist the collar until a mechanical click occurs to confirm lock engagement.
• Shielding Protocols: Leave the coaxial cable shield floating at the probe end. Instead, execute terminal grounding solely at the instrument rack or the Proximitor isolation housing ground terminal block to eliminate ground loops.