Configured for non-contacting shaft displacement and vibration measurements in machinery protection systems, the Bently Nevada 330101-00-24-05-02-00 (330101 Proximity Probe) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

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

• 00: Unthreaded Length option (0.0 in).

• 24: Overall Case Length option (2.4 in).

• 05: Total Length option (0.5 meter / 1.6 feet).

• 02: Connector option (Miniature coaxial ClickLoc connector, standard cable).

• 00: Agency Approval option (No hazardous area approvals required).

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 3300 XL 8 mm probe operates via eddy-current probe scaling calibrated to a standard AISI 4140 steel target. Misalignment or deviation from this target material alters the eddy-current field interaction, requiring recalibration of the scale factor. To accurately trace fluid-film bearing states and real-time rotor dynamics, gap voltage validation (-10 VDC targets) must be verified at the geometric midpoint of the linear range. This static voltage window prevents signal clipping during high-amplitude dynamic vibration cycles. Internal design constraints minimize side-viewing fields, establishing cross-talk suppression when multiple probes are oriented in orthogonal X-Y configurations or tight axial arrays.

Frequently Asked Questions

Q: How does a mismatch in total system electrical length affect performance?

A: The 0.5-meter probe must be connected to an appropriate 3300 XL extension cable to achieve a total system length of 5.0 meters or 9.0 meters. Mismatching the total electrical length introduces severe scale factor non-linearity and errors in the -10 VDC gap voltage baseline.

Q: Can this probe be swapped while the monitoring system is live?

A: Yes. The probe is a passive inductive device and supports hot-swapping at the coaxial interface without disrupting power to the 3500 rack or Proximitor Sensor, provided standard safety procedures for local field loops are followed.

Field Installation Guidelines

• Mechanical Torque Constraints: Do not exceed the maximum torque specification of 13.6 N-m (120 in-lb) when tightening the 3/8-24 UNF mounting nuts. Over-tightening causes case distortion and internal element failure.

• Connector Integrity: Hand-tighten the ClickLoc coaxial connector until an explicit tactile click is verified. Do not use pliers or metallic tools, which can deform the miniature coaxial interface and induce signal noise.

• Clearance Profile: Maintain a minimum counterbore clearance radius of 9.5 mm (0.38 in) around the 8.0 mm probe tip to prevent adjacent structural metal from causing target errors or scale factor dampening.

• Isolation and Grounding: Ensure the coaxial connector junction is insulated using silicone self-bonding tape or connector protectors. The outer shield must remain isolated from structural ground until it terminates at the Proximitor Sensor terminal strip.