Bently Nevada 330103-17-22-10-12-05 3300 XL 8 mm Proximity Probe

The Bently Nevada 330103-17-22-10-12-05 base model 330103 is a non-contacting eddy-current sensor that generates a high-frequency electromagnetic field to convert physical distances into proportional electrical impedance shifts for static gap and dynamic vibration monitoring. This proximity probe interfaces directly with a matching 3300 XL Proximitor sensor to condition field measurements into a linear voltage output signal suitable for machine protection systems.

Technical Summary

The probe operates via eddy-current scaling principles where a high-frequency RF field emitted from the tip induces eddy currents when interacting with a conductive target. The proximity probe circuit experiences an impedance shift relative to the proximity of the target surface. The 3300 XL Proximitor sensor translates this continuous change into a linear voltage signal calibrated for rotor dynamics and shaft vibration analysis.

Hardware Specifications

Engineering Notes

• System Length Tuning: The 1.0 m total length of this probe requires an additional 4.0 m extension cable to achieve the standard 5.0 m system tuning requirement for precise Proximitor sensor calibration.
• Target Material Calibration: Factory calibration is executed specifically for AISI 4140 steel. Alternative target materials alter eddy-current scaling and necessitate corrective variables or dedicated recalibration due to variations in magnetic permeability and electrical conductivity.
• Minimum Target Dimensions: The observed target surface must present a continuous diameter of at least 15.2 mm (0.6 in) to mitigate edge effects that compromise measurement linearity.

Field Guidelines

• Tightening Torque: Limit torque to a maximum of 4.7 N-m (42 in-lb) during thread installation into the machine casing to prevent mechanical deformation or structural failure of the probe tip.
• Thread and Side Clearance: Maintain a minimum lateral clearance of 22 mm from any surrounding counterbore or metallic sidewalls to eliminate parasitic calibration shifts and signal cross-talk.
• Shield Grounding and Insulation: Wrap the miniature coaxial ClickLoc connectors with the supplied silicone self-insulation tape. This isolates the coaxial shield grounding from the machine ground and prevents internal fluid ingress.
• Cable Routing and Bend Radius: Route the fluid-resistant cable ensuring a minimum bend radius of 25.4 mm (1.0 in) to protect the internal dielectric layers from physical fatigue or fracturing.

Suffix Breakdown

• 17: 17 mm unthreaded length for depth positioning control inside the machine housing.
• 22: 22 mm overall case length providing low-profile dimensions for clearance constraint zones.
• 10: 1.0 m (3.3 ft) total cable length.
• 12: Miniature coaxial ClickLoc connector with integrated fluid-resistant cable.
• 05: ATEX, IECEx, and CSA intrinsic safety and non-incendive certifications for hazardous locations (Zone 0, Zone 1, and Zone 2 applications).