Description

The Bently Nevada 330104-00-05-05-02-05 is an unarmored 8 mm proximity probe from the 3300 XL series. It is purpose-built for non-contacting shaft displacement, vibration monitoring, and phase reference (Keyphasor) logging on critical rotating machinery.

While the 330103 series relies on metric M10 x 1 threads, the 330104 series features standard English 3/8-24 UNF mounting threads, and this specific variant features a short 0.5-meter cable along with multi-agency hazardous area approvals.

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).
• 05: Overall Case Length Option (05 = 5.0 inches).
• 05: Total Length Option (05 = 0.5 meters / 1.6 feet).
• 02: Connector and Cable-Type Option (02 = Miniature coaxial ClickLoc connector, standard coaxial cable).
• 05: Agency Approval Option (05 = Multiple approvals including CSA, ATEX, and IECEx intrinsically safe and non-incendive certifications).

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 is the significance of the -05 suffix option for this probe?

A: The -05 suffix designates hazardous area approvals. This option certifies the hardware under CSA, ATEX, and IECEx standards for intrinsic safety and non-incendive installations when wired through a certified Proximitor barrier block.

Q: What extension cable configuration does this 0.5-meter probe require?

A: This specific 0.5-meter total length probe must be paired with an extension cable to achieve a complete system length back to the Proximitor sensor. For instance, a standard 5.0-meter Proximitor system configuration requires a 4.5-meter extension cable, whereas a 9.0-meter system configuration requires an 8.5-meter extension cable.

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.