Bently Nevada 330105-02-12-10-02-00 3300 XL 8 mm Reverse Mount Probes

The Bently Nevada 330105-02-12-10-02-00, also cataloged as the 330105 Reverse Mount Probes, operates as a dedicated hardware component for non-contacting displacement and vibration measurement within 3500 Machinery Protection System platforms. It translates the physical gap distance between the probe tip and the target rotating shaft into a high-frequency eddy-current signal for proximity transmitter evaluation.

Suffix Breakdown & Model Matrix

The model nomenclature breakdown for this technical configuration is defined below:

• 330105: Base model number for 3300 XL 8 mm Reverse Mount Probe (3/8-24 UNF thread parameters).

• 02: Unthreaded length configuration option.

• 12: Overall case length configuration option.

• 10: Total Length Option designating a 1.0 metre (3.3 feet) integrated cable.

• 02: Connector Option specifying a miniature ClickLoc coaxial connector.

• 00: Agency Approval Option specifying no hazardous area certifications required.

Hardware Specifications

Gap Voltage Validation and Rotor Dynamics

Mechanical deployment of this transducer relies on physical gap voltage validation to ensure accurate data capture of rotor dynamics. During static adjustment within the reverse mount housing, the probe position must be manipulated relative to the shaft target until a steady-state value of -10 VDC is obtained at the Proximitor output layer. This voltage calibration maps the physical target position to the absolute center of the linear transduction range, preventing electronic clipping during peak displacement transients. The integrity of this electrical path suppresses external high-frequency interferences, maintaining clean signal metrics across multi-channel proximity tracking loops.

Frequently Asked Questions

Q: Can the 1.0-metre integrated coaxial cable be spliced or modified directly in the field?

A: No. The integrated coaxial cable possesses specific electrical impedance constraints required for matching with the Proximitor loop circuit. Cutting or splicing the cable alters the internal capacitance and invalidates the factory 7.87 V/mm eddy-current calibration factor.

Q: What status behavior occurs if the ClickLoc connector is disconnected during active system operation?

A: Disconnecting the miniature ClickLoc interface breaks the sensor loop circuit. The monitoring module detects the open circuit instantly, forces the signal output to clamp to its upper limit, and switches the associated channel status into a NOT OK fault mode to suppress false trip execution.

Field Installation Guidelines

• Thread Insertion Alignment: Manually thread the 3/8-24 UNF probe housing into the reverse mount sleeve bracket. Ensure no cross-threading occurs before torque is applied to the locknut assembly.

• Cable Bend Path Limitations: Maintain a minimum bend radius of 25.4 mm (1.0 inch) along all segments of the 1.0-metre coaxial cable. Sharp kinks or compressed routing paths degrade insulation layers and compromise shielding performance.

• Shielding Separation Requirements: The ClickLoc connector and internal coaxial shield must remain isolated from any contact with the machine chassis or housing. Use insulated junction boxes and matching protective terminal sleeves to maintain a single-point grounding layout at the monitor rack.

• Target Surface Inspection: Confirm the targeted shaft observation track is free of surface scratches, chrome plating, or structural magnetism, as these conditions cause electrical runout errors that distort vibration readings.