Configured for high-frequency relative displacement monitoring in 3300 XL machinery protection systems, the Bently Nevada 330101-00-08-05-12-CN (330101 Proximity Probe) provides direct physical signal transduction. This hardware captures instantaneous gap distance variations between the probe tip and a conductive target, supplying a modulated radio frequency signal to the Proximitor sensor for data conditioning and analysis.

Model Configuration Matrix

• 330101: 3300 XL 8 mm Proximity Probe

• 00: Unthreaded Length (metric)

• 08: Overall Case Length (metric)

• 05: Total Length (metric)

• 12: Connector Type (Miniature coaxial ClickLoc connector with connector protector)

• CN: Approvals (Country Specific/Standard)

Hardware Specifications

Mechanical & Electrical Transduction Characteristics

Operation of the probe is based on the eddy-current principle, with the oscillator driving the probe tip at 1 MHz. Accurate measurement of rotor dynamics requires strict adherence to the specified 7.87 V/mm (200 mV/mil) scale factor. Field validation must confirm a nominal -10 VDC gap voltage at the monitor output to maintain signal linearity. Furthermore, proper cross-talk suppression between adjacent probe installations is required to prevent 1 MHz frequency interference, which may otherwise introduce harmonic noise into the vibration data stream.

Ordering Information

• 1 x 330101-00-08-05-12-CN Proximity Probe

• 1 x Factory Calibration Certificate

• 1 x Connector protector (installed)

Installation Guidelines

• Mechanical Mounting: Torque the mounting jam nut to established specifications to prevent looseness caused by machine vibration.

• Side-View Clearance: Ensure a minimum of 10 mm clearance from the mounting hole wall to avoid peripheral metal interference.

• Cabling: Route coaxial cables through dedicated grounded metallic conduit, separating signal lines from high-voltage AC cabling.

• Connection Integrity: Verify the ClickLoc coupling is fully seated; ensure the connector protector is secure to prevent moisture ingress.

• Signal Validation: Measure the output voltage at the Proximitor sensor terminal block to verify proper gap adjustment during site commissioning.

Frequently Asked Questions

• Q: Is the 330101 probe compatible with older 3300 series monitors?

  A: No, 3300 XL probes are specifically designed for the 3300 XL Proximitor sensor frequency response and cannot be interchanged with legacy series.

• Q: Can the PPS probe tip be exposed to high-pressure fluids?

  A: The probe assembly is rated for pressure environments up to 60 bar, provided proper O-ring sealing is utilized at the thread interface.

• Q: What is the maximum allowable cable run?

  A: The system is calibrated for a total system length (Probe + Extension Cable) of 5 or 9 meters; exceeding this induces signal attenuation.

• Q: How is the probe case grounded?

  A: The probe case is electrically isolated from the signal common; ensure the monitor system is grounded according to the specific site wiring diagram.

• Q: Can I cut the probe cable to length?

  A: No, cutting the cable alters the system's characteristic impedance and resonant frequency, leading to inaccurate measurement output.

• Q: How to identify a failed probe?

  A: A failed probe typically presents as an open circuit or a hard-scale (full negative or positive) voltage reading at the Proximitor output.

• Q: Does target material affect measurement accuracy?

  A: Probes are calibrated for 4140 steel. Using different conductive materials requires a modification to the nominal scale factor.

• Q: What is the purpose of the 1 MHz carrier?

  A: The 1 MHz frequency is optimized for eddy-current penetration depth in standard carbon steel to provide high-fidelity dynamic displacement data.