330101-00-12-20-02-05 | Bently Nevada | 3300 XL 8 mm Proximity Probe

Configured for displacement measurement in rotating machinery, the Bently Nevada 330101-00-12-20-02-05 (330101-00-12-20-02-05 Proximity Probe) provides direct physical signal transduction for vibration monitoring.

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 330101-00-12-20-02-05 utilizes an eddy-current principle to detect shaft displacement, requiring calibration to a nominal scale factor of 7.87 V/mm (200 mV/mil). During installation, the gap voltage must be validated against the -10 VDC target midpoint to ensure linear operation. Proper alignment and gap adjustment are critical for accurate observation of rotor dynamics, including shaft centerline positioning and vibration magnitude. The system components, including the 3.6 metre probe and 6 metre extension cable, must be installed as a matched set to ensure measurement accuracy and maintain cross-talk suppression between adjacent sensor channels.

Frequently Asked Questions

Q: Can the total system length be modified in the field?

A: No. The system is calibrated as a matched set consisting of the probe, extension cable, and Proximitor sensor. Field-modifying the 9.6 metre total length will alter the electrical impedance and introduce significant measurement errors.

Q: What are the installation requirements for the cable?

A: The minimum bend radius is 25.4 mm (1 inch). Avoid exceeding this limit to prevent damage to the internal coaxial conductors, which could result in signal attenuation or intermittent output.

Field Installation Guidelines

• Mounting: Secure the probe in a rigid, non-conductive holder to prevent mechanical resonance. Ensure the probe tip is installed perpendicular to the target surface.
• Grounding: The probe case is conductive. Ensure the installation bracket is properly grounded to the machinery housing to maintain electromagnetic interference (EMI) immunity.
• Connector Integrity: Use the ClickLoc connector mechanism for all coupling points. Clean the mating faces with an approved electrical contact cleaner before assembly to minimize attenuation.
• Cable Routing: Route the coaxial cable through dedicated metallic conduit, maintaining separation from high-voltage AC lines to prevent induced noise on the displacement signal.