Description

Configured for contactless displacement and vibration measurements in 3300 XL Proximity Transducer System networks, the Bently Nevada 330102-00-28-05-02-05 (330102 8 mm Proximity Probe) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 8 mm proximity probe utilizes eddy-current technology to execute high-precision distance scaling relative to a rotating shaft target. During operation, the 3300 XL Proximitor Sensor drives an RF signal through the integrated 5.0 m cable to the probe tip, generating an electromagnetic field. As the target undergoes rotor dynamics perturbations, changes in the physical gap modulate the eddy-current density on the target material surface. This translates to an output voltage modulation directly proportional to the physical clearance. Proper gap voltage validation requires biasing the probe to target a baseline of -10 VDC at the physical midpoint of the linear range. Strict impedance matching across the 75 ohm coaxial network suppresses cross-talk interference between adjacent channels monitoring the same rotor plane.

Frequently Asked Questions

Q: What are the target physical size constraints for proper eddy-current probe scaling?

A: The minimum flat target diameter must be 15.2 mm (0.6 in). Measuring shaft diameters smaller than 50.8 mm (2.0 in) alters the incremental scale factor (ISF) from the standard 7.87 V/mm (200 mV/mil) calibration.

Q: How do electrical limits affect the installation of this probe inside hazardous areas?

A: Under the 05 multiple approval option, the probe satisfies intrinsic safety parameters when connected to certified barriers. Safe operation limits restrict input parameters to a maximum voltage (Ui) of -26 VDC and input current (Ii) of 140 mA.

Field Installation Guidelines

• Thread Engagement: Ensure a minimum thread engagement of 5 full turns within the mounting bracket or housing to prevent mechanical looseness under high-frequency structural vibration.
• Shield Grounding: Terminate the external coaxial extension cable outer shield only at the Proximitor Sensor housing. Do not allow the probe case or coaxial connector bodies to touch intermediate conduit boxes or structural steel to prevent ground loops.
• Bend Radius Limits: Maintain a minimum physical bend radius of 25.4 mm for the coaxial cable lead during routing to eliminate internal conductor degradation and signal impedance shifts.