The Bently Nevada 330101-00-20-05-02-00, also cataloged as the 330101 Proximity Probe, operates as a dedicated hardware component for continuous non-contacting shaft vibration and position measurement within 3300 XL monitoring platforms. This unit functions by detecting the instantaneous relative motion between the probe tip and a conductive target, generating a modulated radio frequency signal for processing by the associated Proximitor sensor.

Model Suffix Breakdown

• 330101: 3300 XL 8 mm Proximity Probe

• 00: Unthreaded Length (metric)

• 20: Overall Case Length (metric)

• 05: Total Length (metric)

• 02: Connector Type (Miniature ClickLoc)

• 00: Agency Approval (Not required)

Hardware Specifications

Mechanical Monitoring & Eddy-Current Dynamics

The measurement accuracy of the 3300 XL system relies on precise eddy-current probe scaling, typically calibrated at 7.87 V/mm (200 mV/mil). During installation and commissioning, gap voltage validation is required to ensure the probe operates at a -10 VDC target within the Proximitor linear range. To ensure measurement fidelity, cross-talk suppression must be implemented by maintaining a minimum physical separation of 40 mm between adjacent probe tips, preventing 1 MHz carrier frequency interference.

Ordering Information

• 1 x 330101-00-20-05-02-00 Proximity Probe

• 1 x Connector protector

• 1 x Technical documentation

Installation Guidelines

• Mechanical Mounting: Use a torque wrench to tighten the jam nut, ensuring the probe remains stationary under high-vibration conditions.

• Side-View Limitation: Maintain a clearance of at least 10 mm from the mounting hole wall to prevent peripheral metal interference.

• Cabling: Use grounded metallic conduit for coaxial cable runs to provide shielding against external electromagnetic interference.

• Coupling: Verify the ClickLoc connection is fully seated; ensure the protective sleeve is secured to prevent moisture ingress.

• Signal Check: Perform a gap voltage measurement at the monitor terminal block to verify proper spacing before machine rotation.

Frequently Asked Questions

• Q: Can I use this probe with a non-XL series Proximitor?

  A: No. 3300 XL probes are specifically impedance-matched to 3300 XL Proximitors. Compatibility with older 3300 series is not supported.

• Q: How do I verify if the PPS tip is damaged?

  A: Visually inspect the tip for cracks or gouges. Physical damage to the tip alters the electromagnetic field and results in output drift.

• Q: What is the maximum pressure rating for this probe?

  A: The probe is rated for operation in environments up to 60 bar when installed with proper sealing gaskets.

• Q: Does the target material affect output?

  A: Yes, probes are factory-calibrated for 4140 steel. Ferrous or non-ferrous targets with different magnetic properties require scale factor adjustments.

• Q: Can the coaxial cable be repaired if cut?

  A: No. The coaxial cable is an integral component of the resonant circuit; splicing or repairing the cable ruins the frequency response.

• Q: Why is -10 VDC the nominal target?

  A: The -10 VDC target centers the gap distance within the linear range, providing the maximum dynamic range for vibration amplitude capture.

• Q: Is this probe intrinsically safe?

  A: Compliance with hazardous area standards depends on the use of approved isolation or Zener barriers in the circuit loop.

• Q: How often should I check the gap voltage?

  A: Gap voltage should be verified during commissioning, after any maintenance near the probe, or during periodic machine health audits.