Description

The Bently Nevada 330103-08-13-10-02-05, also cataloged as the 330103 Proximity Probe, operates as a dedicated hardware component for non-contact shaft vibration and displacement measurements within Bently Nevada 3500 and 3300 Machinery Protection System platforms. The sensor utilizes a high-frequency eddy-current field to detect minute distance variations between the target shaft and the probe tip. The mechanical assembly features an unthreaded cylindrical probe body designed for internal or specialized bracket mounting configurations. The internal circuitry transmits modulated radio frequency voltages to an external Proximitor sensor, enabling high-fidelity translation of mechanical displacement into analog signals without physical contact.

Suffix Breakdown & Model Matrix

• 330103: Base Model Number for the 3300 XL 8 mm Proximity Probe (Unthreaded Smooth Case).
• -08: Unthreaded Length option specifying an 80 mm smooth barrel length.
• -13: Overall Case Length option dictating a total probe body length of 130 mm.
• -10: Total Length option establishing a 1.0 m (3.3 ft) integrated cable length.
• -02: Connector Option designating a miniature coaxial ClickLoc connector with standard unarmored construction.
• -05: Agency Approval Option confirming multiple hazardous area certifications, including ATEX, IECEx, and CSA intrinsic safety approvals.

Hardware Specifications

Eddy-Current Scaling and TSI Performance

The sensor assembly executes eddy-current probe scaling based on the magnetic permeability and electrical conductivity of the targeted shaft material. To ensure measurement fidelity, the physical installation requires gap voltage validation to confirm a baseline target of -10 VDC inside the linear mid-scale operating band. This baseline tuning allows the connected monitoring rack to capture dynamic rotor dynamics, tracking thermal growth, eccentricities, and transient shaft orbit profiles. Advanced physical shielding on the integrated coaxial extension line provides robust cross-talk suppression. This configuration maintains signal purity when multiple 8 mm unthreaded probes mount adjacently inside a single fluid-film bearing housing block.

Frequently Asked Questions

Q: Does this unthreaded probe version utilize the same installation brackets as standard threaded proximity probes?

A: No. Unthreaded probes require a smooth-bore slide-in mounting bracket or a split-clamp block assembly. The probe body must be locked using an external setscrew or clamping plate rather than being threaded directly into the housing wall.

Q: Is the 1.0 m integrated cable compatible with any length of extension cable?

A: No. The 1.0 m probe must pair exclusively with a 4.0 m or 8.0 m extension cable to achieve a total system loop length of 5.0 m or 9.0 m. Mismatched system lengths disrupt the calibrated 200 mV/mil scale factor.

Field Installation Guidelines

• Verify that the split-clamp or slide-bracket setscrew does not deform the smooth 8 mm stainless steel probe body during mechanical lockdown.
• Measure the gap voltage through the Proximitor sensor buffered output during mechanical positioning to guarantee a stable -10 VDC static offset before final tightening.
• Maintain a minimum 3x tip diameter radial clearance from any adjacent static structural metal components to prevent side-view sensing distortions.
• Tighten the ClickLoc miniature coaxial connectors by hand until they click to secure the connection. Do not apply mechanical pliers, which strip or damage the internal fluoropolymer insulation layers.