Configured for non-contacting displacement measurement in rotating machinery monitoring systems, the Bently Nevada 330101-00-36-10-01-00 (330101 Proximity Probe) provides direct physical signal generation based on shaft surface proximity to the transducer tip.

Model Suffix Configuration Matrix

• 330101: 3300 XL 8 mm Proximity Probe, 3/8-24 thread, without armor.

• 00: Unthreaded Length Option (00 mm).

• 36: Total Case Length Option (3.6 meters).

• 10: Total Length Option (1.0 meter).

• 01: Agency Approval Option (CSA, ATEX, IECEx for hazardous areas).

• 00: Internal Mounting Thread/Connection Style (Standard).

Hardware Specifications

Rotor Dynamics and Signal Integrity

The 3300 XL system requires precise eddy-current probe scaling to convert target distance into a proportional voltage signal. Operators must ensure gap voltage validation, targeting a -10 VDC setpoint within the 2 mm linear range to maintain accuracy. Rotor dynamics parameters, such as vibration amplitude and shaft position, are output through the Proximitor sensor. Cross-talk suppression is achieved by observing minimum spacing requirements between adjacent probes to prevent high-frequency carrier wave interference on the coaxial cable.

Ordering and Packaging

1. 1 x 330101-00-36-10-01-00 Proximity Probe

2. 1 x Threaded locknut with safety wire holes

3. 1 x Connector protector

Installation Protocols

• Mechanical Mounting: Thread the probe into the mounting bracket. Ensure at least 5 threads of engagement if using NPT interfaces, though standard 3/8-24 threads require firm locking via the jam nut.

• Shielding: Ensure the coaxial cable is not routed alongside high-power AC cables to prevent inductive noise injection into the signal path.

• Grounding: Maintain electrical isolation between the probe case and the machine housing if required by the monitoring system design to prevent ground loops.

• Calibration: Perform a static calibration check against the target material to ensure the scale factor remains within 7.87 V/mm (200 mV/mil).

Frequently Asked Questions

• What is the frequency response of this probe?

  The probe responds from 0 Hz to 10 kHz, ensuring accurate capture of both static gap position and dynamic vibration frequencies.

• Can the probe cable be shortened in the field?

  No. The system is factory-calibrated for a specific total length. Cutting or splicing the cable alters the system impedance and invalidates the signal linearity.

• What happens if the probe tip touches the rotor?

  Physical contact may damage the plastic tip material and affect the eddy-current field, potentially leading to signal distortion or permanent transducer failure.

• How do I check the probe for internal damage?

  Use an ohmmeter to measure the resistance between the center conductor and the shield; a short or open circuit indicates internal failure.

• Is this probe compatible with all 3300 series monitors?

  It is optimized for the 3300 XL Proximitor sensor; verify that the monitor interface card is configured for 8 mm probe input.

• What material is required for the target?

  The system is calibrated for AISI 4140 steel. Using other materials requires re-calibration or the use of correction factors.

• What is the function of the connector protector?

  It prevents contamination by oil and moisture, which could otherwise cause signal impedance fluctuations in the coaxial connection.

• Does the probe require a specific installation torque?

  Apply standard torque recommended for 3/8-24 hardware, ensuring the probe remains stationary during machine operation under vibration.