3300 XL 8 mm | Bently Nevada 330106-05-30-15-02-00 Reverse Mount Probes

The Bently Nevada 330106-05-30-15-02-00 serves as the primary 330106 Reverse Mount Probe utilized to execute non-contacting shaft displacement and dynamic vibration measurements across 3500 Machinery Protection System platforms. The module operates via high-frequency eddy-current generation, translating physical proximity changes into corresponding electrical voltage variations when connected to a 3300 XL Proximitor Sensor.

Suffix Breakdown & Model Matrix

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

• 330106: Base model number for 3300 XL 8 mm Reverse Mount Probe (3/8-24 UNF-2A thread parameters).

• 05: Specifies the overall probe length option of 0.5 inches (12.7 mm).

• 30: Specifies the case length option of 3.0 inches (76.2 mm).

• 15: Total Length Option designating a 1.5 metre (4.9 feet) integrated cable length.

• 02: Connector Option specifying a miniature coaxial ClickLoc 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, which spans 2.0 mm (80 mils). Maintaining this calibrated gap ensures the conversion complies with the factory eddy-current probe scaling factor of 7.87 V/mm (200 mV/mil), while integrated cable shielding provides cross-talk suppression against adjacent sensor loops within the machinery casing.

Frequently Asked Questions

Q: Can the 1.5-meter 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-2A probe housing into the reverse mount sleeve bracket. Ensure no cross-threading occurs before torque is applied to the locknut assembly to prevent damage to the 76.2 mm case.

• Cable Bend Path Limitations: Maintain a minimum bend radius of 25.4 mm (1.0 inch) along all segments of the 1.5-meter 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 matches the AISI 4140 steel standard calibration criteria and is free of surface scratches or structural magnetism, as these conditions cause electrical runout errors that distort vibration readings.