Bently Nevada 330709-000-040-50-02-00 3300 XL 11 mm Proximity Probe

Configured for high-range displacement sensing in machine monitoring systems, the Bently Nevada 330709-000-040-50-02-00 (330709 11 mm Proximity Probe) provides direct physical execution of non-contact vibration and shaft position measurement. This probe is engineered for reverse-mount applications within the 3300 XL platform, converting radial or axial shaft movement into proportional voltage signals.

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

The 330709 transducer system operates on the principle of eddy-current probe scaling, producing a linear scale factor of 7.87 V/mm (200 mV/mil). During installation, verify the gap voltage at the Proximitor sensor output; the target is -10 VDC when the probe is positioned at the linear center of its range. Effective cross-talk suppression is required when multiple transducers are installed in close proximity, necessitating the use of grounded metallic conduit to prevent electromagnetic interference from adjacent high-voltage or high-frequency switching circuits.

Frequently Asked Questions

Q: Can the 330709 probe be paired with an 8 mm Proximitor sensor?

A: No. The Proximitor sensor must be specifically matched to the 11 mm probe tip geometry and coil inductance. Mixing mismatched components will result in incorrect scale factors and non-linear outputs.

Q: Is field-shortening of the coaxial lead permitted?

A: No. The factory-calibrated loop resistance and capacitance are dependent on the specific cable length provided. Modification of the cable alters the system's characteristic impedance and invalidates the output linearity.

Field Installation Guidelines

• Mounting: Ensure the probe is mounted perpendicular to the target shaft. Tighten the locking nut to secure the probe body against vibration, ensuring that NPT threads or metric interfaces achieve proper engagement.
• Shielding: Maintain shield continuity through the coaxial connectors. The system must be grounded at a single point, typically at the Proximitor terminal block, to eliminate ground loop currents.
• Connector Integrity: Inspect the ClickLoc connector interface for contaminants before mating. The connection must be fully seated until an audible click is detected.
• Cable Routing: Adhere to the minimum bend radius of 25.4 mm (1.0 inch). Do not subject the coaxial cable to tension during installation to prevent deformation of the internal dielectric.