Description

The Bently Nevada 330105-02-12-05-02-05 is a specialized 8 mm Reverse Mount proximity probe from the 3300 XL product family. Reverse mount probes are specifically engineered to be threaded into a machine housing or internal bracket from the inside out, or through the back of a specialized adapter sleeve. This makes them ideal for applications where external access or radial space is severely restricted.

The 330105 series features English 3/8-24 UNF mounting threads. This specific model configures a compact 1.2-inch case length, a 0.5-meter integral cable, a pre-installed connector protector sleeve, and comprehensive multi-agency certifications for explosive atmospheres.

Suffix Breakdown & Model Matrix

The alphanumeric suffix combination defines the specific mechanical, electrical, and hazardous area configurations of this assembly:

• 330105: Base model for 3300 XL 8 mm Reverse Mount Proximity Probe with 3/8-24 UNF threads.
• 02: Unthreaded Length Option (02 = 0.2 inches).
• 12: Overall Case Length Option (12 = 1.2 inches).
• 05: Total Length Option (05 = 0.5 meters / 1.6 feet).
• 02: Connector and Cable-Type Option (02 = Miniature coaxial ClickLoc connector, standard coaxial cable).
• 05: Agency Approval Option (05 = Multiple Approvals, incorporating ATEX, IECEx, and CSA certifications for intrinsically safe and non-incendive environments).

Note on Suffix -02-05: In the 330105 reverse mount catalog configuration, selecting the combination of the cable option -02 along with global hazardous area approvals -05 ensures the probe is shipped with a standard coaxial cable equipped with a pre-installed connector protector sleeve.

Hardware Specifications

Eddy-Current Probe Scaling & Reverse Mounting Dynamics

During operation, high-frequency RF fields generated by the Proximitor loop penetrate the target surface. Because reverse mount probes are typically threaded into internal brackets or adapter sleeves inside the housing, meticulous care must be taken to ensure that surrounding sleeve surfaces do not cross into the probe tip’s wide RF path. To establish a stable operating baseline for rotor dynamics tracking, field engineers must validate that the gap voltage achieves a target value of -9 VDC to -10 VDC at the geometric center of the linear zone.

Frequently Asked Questions

Q: What extension cable configuration does this 0.5-meter probe require? A: This short 0.5-meter total length probe must be paired with a standard 3300 XL extension cable to complete the circuit back to the Proximitor sensor. For a standard 5.0-meter system loop, it requires a 4.5-meter extension cable; for a 9.0-meter system loop, it requires an 8.5-meter extension cable.

Q: What protection advantages does the pre-installed connector protector sleeve provide? A: The protector sleeve provides an environmental barrier around the miniature ClickLoc connection point. Since reverse-mount junctions often reside inside enclosures or housings prone to oily atmospheres, mist, or high moisture, this sleeve seals out contaminants to maintain low connection resistance and prevent signal spiking.

Field Installation Guidelines

• Sleeve Clearance: Ensure the internal installation port or housing sleeve has a counterbore clearance diameter of at least 2 or more probe tip diameters (16 mm or 0.63 inches minimum) around the tip to prevent side-loading calibration anomalies.
• Torque Limits: When installing the 3/8-24 UNF reverse mount threaded case, 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.