The Bently Nevada 330130-045-01-05, also cataloged as the 330130 Proximity Probe, operates as a dedicated hardware component for contactless eddy-current displacement measurements within 3500 Machinery Protection Systems. Configured with a 1-meter unarmored cable, this 8 mm transducer converts physical rotor dynamic displacements into proportional voltage signals via a Proximitor Sensor loop.

Part Number Nomenclature

• 330130: 3300 XL 8 mm Proximity Probe, M10 x 1 thread, without armor.

• -045: Unthreaded length of 45 mm.

• -01: Overall case length of 100 mm.

• -05: Total cable length option of 0.5 meter (Note: exact physical configuration is defined by Bently Nevada installation manuals for total system loop lengths of 5.0 meters or 9.0 meters).

Transducer Hardware Specifications

Turbine Supervisory Instrumentation (TSI) Performance

The sensor utilizes eddy-current probe scaling to convert target surface distances into a linear voltage profile. When setting up the mechanical loop, the standard gap voltage validation requires biasing the probe tip to a target of -10 VDC, representing the center of the linear calibration displacement arc. This voltage setup ensures the system captures rotor dynamics, such as shaft vibration and axial position, with high precision. The internal impedance matching of the gold-plated click-loc coaxial connectors ensures cross-talk suppression and maintains signal fidelity across variable high-frequency paths.

Package Manifest

• 1 x Bently Nevada 330130-045-01-05 Proximity Probe

• 2 x Hexagonal locknuts (M10 x 1 thread)

• 1 x Coaxial connector silicone protection boot

• 1 x Factory calibration certificate

Field Alignment Protocol

• Mechanical Mechanical Threading

  Ensure the mounting bore has standard M10 x 1 threads. Hand-tighten the probe body into the bracket, ensuring the face engages at least 5 full threads of the bracket structure to avoid misalignment under high vibration.

• Electrical Insulation and Shielding

  Keep the outer coaxial cable shield separate from any conduit or junction box grounds. Grounding must occur exclusively at the monitor rack terminal block to block stray eddy currents from shifting measurement data.

• Cable Routing Radius Limitations

  Do not bend the coaxial cable tighter than a 25.4 mm radius. Sharp kinks degrade high-frequency signals and lead to structural failure of the inner conductor over time.

Technical Inquiry Matrix

• What is the standard gap voltage target for zero-point calibration during installation?

  The target is -10 VDC, which corresponds to the midpoint of the linear displacement range for the 8 mm transducer loop.

• Can this probe be connected directly to a standard 4-20 mA analog input card?

  No. The passive probe must connect to a 3300 XL Proximitor Sensor, which modulates the high-frequency signal into an analog voltage before routing to a monitor.

• What is the effect of crossing the probe cable near high-voltage AC lines?

  It introduces electromagnetic noise. Maintain isolation from AC power wiring to ensure signal integrity and proper cross-talk suppression.

• Is it permissible to alter the physical length of the probe cable by splicing?

  No. Cutting or splicing the cable modifies the tuned electrical length, destroying system calibration and causing scale factor errors.

• What occurs if the connector contacts are exposed to moisture or dirt?

  The signal will degrade, causing unstable gap voltage readings. Use the included silicone protection boot to seal the click-loc connection points.

• How do you confirm the probe is isolated from the machine housing ground?

  Use a digital multimeter to verify resistance between the outer coaxial connector shell and the machine case. It must read over 50 megohms.

• What structural target criteria are required for proper eddy-current probe scaling?

  The target must be a ferromagnetic material, ideally AISI 4140 steel, with a smooth surface finish and a minimum diameter of 15.2 mm.

• Can this unarmored probe configuration withstand submersion in synthetic lube oil?

  Yes, the probe tip and cable materials are rated for continuous exposure to typical industrial machinery lubricants and hydraulic fluids.