330106-05-30-10-02-05 | Bently Nevada | 3300 XL 8 mm Reverse Mount Probes

The Bently Nevada 330106-05-30-10-02-05 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 configuration is defined as follows:

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

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

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

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

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

• 05: Agency Approval Option designating multiple regional certifications including CSA, ATEX, and IECEx intrinsic safety mandates.

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: How does Option 05 agency approval affect field installation parameters?

A: Option 05 indicates certified compliance for explosive atmospheres under ATEX, IECEx, and CSA frameworks. Installation requires routing the sensor circuit through a matching certified intrinsic safety barrier inside the local enclosure to restrict loop energy under fault conditions.

Q: What output behavior occurs at the monitor rack if the ClickLoc connector unlatches during active machinery operation?

A: An unlatched connector forces an open-circuit state across the proximity circuit loop. The Proximitor detects this resistance shift and drives its voltage output to maximum saturation, prompting the monitor card to trigger a NOT OK fault code and inhibit false relay tripping.

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 1.0-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 calibration criteria and is free of surface scratches or structural magnetism, as these conditions cause electrical runout errors that distort vibration readings.