Description

The Bently Nevada 330104-00-05-05-11-05 is an 8 mm unarmored proximity probe within the 3300 XL series. It is engineered for non-contacting shaft displacement, radial 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. This specific model integrates a specialized fluid-resistant cable assembly paired with a connector protector and multi-agency hazardous area approvals.

Suffix Breakdown & Model Matrix

The alphanumeric suffix combination defines the specific mechanical, electrical, and environmental 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).
• 11: Connector and Cable-Type Option (11 = Miniature coaxial ClickLoc connector with connector protector, fluid-resistant FluidLoc 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 environmental advantages do the -11 cable/connector option provide?

A: The -11 configuration features a fluid-resistant cable core designed to prevent oils or process fluids from wicking through the cable interior. Additionally, it includes an integrated connector protector sleeve that shields the ClickLoc coupling from humidity, moisture, and particulate contamination within the bearing housing.

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 a matching 3300 XL extension cable to achieve a complete system length back to the Proximitor sensor. For example, a standard 5.0-meter system loop requires a 4.5-meter extension cable, whereas a 9.0-meter system loop 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 Protector Deployment: Clean the gold-plated ClickLoc connector faces of any residue and twist until it clicks into place. Afterward, firmly slide the built-in protector sleeve completely over the junction to seal it.
• 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.