Description

The Bently Nevada 330104-12-20-10-02-00 is a rugged, factory-armored 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 rotating machinery.

The 330104 series features metric M10 x 1 mounting threads and includes integrated stainless steel interlocking armor by default to protect the underlying cable assembly from harsh, abrasive industrial environments. This specific configuration features a 120 mm unthreaded portion with a 200 mm overall case length and a standard 1.0-meter cable assembly.

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 M10 x 1 metric thread and integral stainless steel armor.
• 12: Unthreaded Length Option (12 = 120 mm / ~4.7 inches).
• 20: Overall Case Length Option (20 = 200 mm / ~7.9 inches).
• 10: Total Length Option (10 = 1.0 meter / 3.3 feet).
• 02: Connector and Cable-Type Option (02 = Miniature coaxial ClickLoc connector, armored standard 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. 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 extension cable configuration does this 1.0-meter probe require?

A: This specific 1.0-meter total length probe must be paired with an extension cable to complete the circuit back to the Proximitor sensor. For a standard 5.0-meter system configuration, it requires a 4.0-meter extension cable. For a 9.0-meter system configuration, it must be paired with an 8.0-meter extension cable.

Q: Can the stainless steel armor sheath be removed if space is tight?

A: No. The interlocking armor is integrated at the factory to protect the underlying miniature coaxial cable from abrasion, sharp bends, or mechanical crushing. Removing it will permanently damage internal shielding. If a non-armored probe is mandatory for your physical routing constraints, use the 330103 metric series instead.

Field Installation Guidelines

• Mechanical Clearance: Maintain a minimum counterbore clearance of 2 or more probe tip diameters (16 mm minimum) to avoid side-loading errors from surrounding metal structures.
• Torque Limits: When installing the M10 x 1 threaded case into the mounting bracket, do not exceed the maximum allowable tightening torque of 12 N·m (106 in·lb) to prevent case distortion.
• 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.