Description

The Bently Nevada 330104-00-08-50-12-00 is an unarmored 8 mm proximity probe from the 3300 XL series. It is precision-engineered for non-contacting shaft displacement, radial vibration monitoring, and phase reference (Keyphasor) logging on critical industrial machinery.

While the 330103 series relies on metric threads, the 330104 series features standard English 3/8-24 UNF mounting threads. This specific model features an 8.0-inch overall case length and is configured with an armored 5.0-meter integral cable.

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 probe tip.
• 00: Unthreaded Length Option (00 = 0.0 inches).
• 08: Overall Case Length Option (08 = 8.0 inches).
• 50: Total Length Option (50 = 5.0 meters / 16.4 feet).
• 12: Connector and Cable-Type Option (12 = Miniature coaxial ClickLoc connector, armored coaxial cable).
• 00: Agency Approval Option (00 = Not required / no approvals).

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. The stainless steel armor on this model provides superior mechanical protection in high-vibration or harsh industrial environments.

Frequently Asked Questions

Q: What is the primary benefit of the -12 armored cable option?

A: The -12 suffix indicates that the probe cable is encased in a protective stainless steel armor. This significantly enhances the cable’s resistance to mechanical damage, crushing, or abrasion in industrial environments where cables may be exposed to loose debris or maintenance activity.

Q: Can this 5.0-meter total length probe connect directly to a 5.0-meter Proximitor sensor?

A: Yes. Because this probe features an integrated 5.0-meter total length option, it connects directly to a standard 5.0-meter Proximitor sensor without requiring an intermediary 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).
• Armor Handling: While the stainless steel armor is robust, ensure the bend radius of the cable does not fall below 25 mm (1.0 inch) to prevent structural fatigue of the inner coaxial core.
• 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.