Configured for high-precision shaft displacement monitoring in 3300 XL transducer systems, the Bently Nevada 330101-00-61-20-02-05 (330101 Proximity Probes) provides direct physical signal execution via eddy-current induction.

Model Configuration Logic

The 330101-00-61-20-02-05 specifies an 8 mm proximity probe assembly within the 3300 XL series. The alphanumeric sequence defines the mechanical and electrical interface: the "00" unthreaded length allows for maximum thread engagement, "61" defines the specific case length, "20" denotes the total system length, while "02" and "05" signify the connector type and agency approval compliance respectively.

Hardware Specifications

Rotor Dynamics and Transducer Scaling

This proximity probe functions by generating an electromagnetic field that reacts to the target shaft's surface. The transducer system converts the gap between the probe tip and the target into a linear voltage output. Achieving a precise gap voltage validation, ideally targeting -10 VDC, is necessary for maintaining linear measurement accuracy. Proper rotor dynamics monitoring relies on minimizing signal drift; therefore, cross-talk suppression must be enforced by maintaining manufacturer-specified distances between probes in multi-channel monitoring configurations.

Ordering Info

• One (1) 330101-00-61-20-02-05 Proximity Probe

• Two (2) 3/8-24 UNF locking nuts

• One (1) ClickLoc cable connector protector

• Factory linearity certification (4140 steel target)

Field Installation Guidelines

• Mechanical Alignment:

• Clear mounting threads of metallic residue or debris.

• Use a depth micrometer to confirm the gap distance against the target before tightening lock nuts.

• Electrical Termination:

• Mate ClickLoc connectors using an axial push motion until a positive tactile engagement is felt.

• Verify signal continuity at the monitor rack test points.

• Grounding and Shielding:

• Ensure the probe body maintains a consistent low-impedance ground to the machine casing.

• Secure coaxial cables in grounded metallic conduit to prevent external EMI/RFI noise.

Technical Questions

• What is the impact of shaft material on the output signal?

  The probe is calibrated for 4140 steel. Using other alloys will alter the scale factor, requiring adjustment at the monitoring rack to maintain accuracy.

• Can the 2.0 meter system length be trimmed in the field?

  No. The coaxial cable impedance is factory-matched to the Proximitor. Modification will introduce signal reflections and invalidate the calibration.

• What causes a constant -24 VDC reading on the monitor?

  A reading at the supply voltage rail typically indicates an open circuit, such as a broken cable or a loose connector.

• How is vibration at the mounting site managed?

  Use the provided jam nuts to secure the probe body. Rigid mounting is required to ensure that mechanical resonance does not corrupt the vibration signal.

• Can this probe be used for rotational speed measurement?

  Yes. The 8 mm probe detects discontinuities (keyways or notches) to provide a pulse-per-revolution signal for speed-monitoring cards.

• What is the minimum allowable bend radius for the cable?

  Maintain a minimum radius of 25 mm to prevent stress on the internal coaxial center conductor and dielectric.

• Is the probe compatible with legacy 3300 series Proximitors?

  No. 3300 XL probes are electrically optimized for 3300 XL hardware; mismatching will lead to significant measurement errors.

• How is electrical isolation ensured?

  The probe tip is electrically isolated from the stainless steel housing using the Bently Nevada TipLoc process, preventing ground loops.