Description

The Bently Nevada 330106-05-30-50-02-00 is a specialized 8 mm Reverse Mount proximity probe belonging to the industry-standard 3300 XL transducer product family. Reverse mount probes are designed to be threaded into a machine housing, bearing block, or internal adapter sleeve from the inside out. This configuration is ideal for applications where external clearance is extremely tight or direct access to the shaft path is obstructed from the outside.

While the 330105 reverse mount series utilizes standard English threads, the 330106 series features metric M10 x 1 mounting threads. This specific configuration combines a 50 mm unthreaded sleeve portion with a 30 mm threaded case length, paired with a long 5.0-meter integral cable assembly (which typically allows the probe to connect directly to the Proximitor sensor without requiring a separate extension cable).

Suffix Breakdown & Model Matrix

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

• 330106: Base model for 3300 XL 8 mm Reverse Mount Proximity Probe with M10 x 1 metric threads.
• 05: Unthreaded Length Option (05 = 50 mm / ~2.0 inches).
• 30: Overall Case Length Option (30 = 30 mm / ~1.2 inches).
• 50: Total Length Option (50 = 5.0 meters / 16.4 feet).
• 02: Connector and Cable-Type Option (02 = Miniature coaxial ClickLoc connector, standard coaxial cable).
• 00: Agency Approval Option (00 = Not required / no approvals).

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: Does this 5.0-meter probe require an extension cable?

A: In a standard 5.0-meter system configuration, no extension cable is needed. The 5.0-meter integral cable routes directly from the machine housing to the 5.0-meter Proximitor sensor. However, if you are attempting to connect this to a 9.0-meter Proximitor sensor, it must be paired with a 4.0-meter extension cable.

Q: Can this probe be swapped with a 330105 model?

A: Electrically they use the same 8 mm tip and 3300 XL electronics. However, mechanically they are completely incompatible because the 330106 utilizes an M10x1 metric reverse mount thread, while the 330105 series utilizes an imperial 3/8-24 UNF reverse mount thread.

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 minimum) around the tip to prevent side-loading calibration anomalies from surrounding metal structures.
• Torque Limits: When installing the M10 x 1 reverse mount threaded case, do not exceed the maximum allowable tightening torque of 11.2 N·m (100 in·lb) to avoid damage or case distortion.
• Connector Integrity: Ensure the miniature coaxial ClickLoc connector faces remain completely free of moisture and process oil splash. Subsequently, twist the collar until a mechanical click occurs to confirm lock engagement.
• 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.