330106-05-30-05-02-05 | Bently Nevada | 3300 XL 8 mm Reverse Mount Probes

Configured for displacement measurement in machinery protection systems, the Bently Nevada 330106-05-30-05-02-05 (3300 XL) Reverse Mount Probe provides direct physical execution of eddy-current sensing against rotating shaft targets.

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 3300 XL 8 mm system requires strict adherence to eddy-current probe scaling to ensure linear displacement output. As a reverse-mount component, the probe is installed from the inside of the machine case, requiring precise positioning to maintain the air gap between the probe tip and the shaft target. The system relies on a -10 VDC gap voltage target to establish the operational linear range. Cross-talk suppression is managed by maintaining adequate spatial separation between multiple probes mounted in the same radial plane to prevent mutual interference of the electromagnetic carrier fields.

Frequently Asked Questions

Q: Can the integral 0.5 meter cable be modified or repaired in the field?

A: No. The probe and its integral cable are factory-calibrated as a single matched assembly. Modification of the cable length or connector replacement changes the system capacitance and impedance, which renders the calibration invalid.

Q: What is the purpose of the Viton O-ring included with the probe assembly?

A: The Viton O-ring acts as a seal for differential pressure between the probe tip and the machine case. It is designed to maintain system integrity under operational pressures. Note that these probes are not pressure-tested prior to shipment; application-specific pressure testing must be coordinated separately.

Field Installation Guidelines

• Mounting: Ensure the reverse mount probe is seated correctly in the housing to maintain the required gap distance. Verify that the mounting surface is free of burrs or contaminants.
• Torque: Tighten the mounting hardware to the specified torque values provided in the installation manual to prevent mechanical damage to the SST case or the probe tip.
• Grounding: To prevent ground loops, verify the electrical isolation between the probe housing and the machine case if the installation design requires an isolated configuration.
• Verification: Following installation, manually rotate the shaft (if possible) or utilize a gap-setting tool to verify that the gap voltage is within the linear operating range at the monitor interface.