Bently Nevada 330703-000-070-10-02-00 3300 XL 11 mm Proximity Probe

The Bently Nevada 330703-000-070-10-02-00, also cataloged as the 330703 Proximity Probe, operates as a dedicated hardware component for non-contact displacement sensing within machine monitoring systems. This probe converts axial or radial shaft position variations into proportional voltage signals, serving as the primary input sensor for 3300 XL transducer platforms.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 330703 system is engineered to provide a linear scale factor of 7.87 V/mm (200 mV/mil) when measured against AISI 4140 steel targets. To ensure accuracy in rotor dynamics analysis, the gap voltage must be validated at the Proximitor sensor output during commissioning. A nominal target of -10 VDC at the linear center of the probe range is required. To maintain signal integrity and prevent data corruption, cross-talk suppression must be implemented by routing transducer cables in dedicated metallic conduit, isolated from high-frequency electromagnetic interference and switching power circuits.

Frequently Asked Questions

Q: Can the 330703 11 mm probe be utilized in place of an 8 mm probe?

A: No. The probe tip geometry and coil inductance are specifically matched to the associated Proximitor sensor. Substituting probe diameters without replacing the corresponding Proximitor will result in incorrect scale factors and non-linear measurement output.

Q: Is field-shortening of the 1.0 m integral cable permitted?

A: No. The assembly is factory-calibrated as a complete loop. Modifying the cable length alters the electrical capacitance and characteristic impedance of the system, which invalidates the calibration and compromises measurement precision.

Field Installation Guidelines

• Mounting: Thread the M14 x 1.5 probe body into the mounting bracket until the required gap is achieved. Secure with a locking nut to prevent loosening due to vibration.
• Shielding: Maintain shield continuity through the coaxial connectors. The system must be grounded at a single point, typically the Proximitor terminal block, to eliminate ground loop currents.
• Connector Care: Use the ClickLoc interface for signal connection. Ensure the connector is free of debris and fully seated until an audible click is heard.
• Cable Routing: Adhere to a minimum static bend radius of 25.4 mm (1.0 inch). Avoid tension on the cable during installation to prevent deformation of the internal coaxial geometry.