Configured for contactless eddy-current displacement measurements in Machinery Protection Systems, the Bently Nevada 330103-00-04-10-11-CN (330103 Proximity Probe) provides direct physical/electrical execution. This 8 mm transducer converts relative shaft dynamic movements into proportional electrical voltage metrics through an interconnected Proximitor Sensor tracking loop.

Option Key Configuration

• 330103: 3300 XL 8 mm Proximity Probe, 3/8-24 UNF thread, without armor.

• -00: Unthreaded length option of 0.0 inches.

• -04: Overall case length option of 4.0 inches.

• -10: Total length option of 1.0 meter (3.3 feet).

• -11: Miniature coaxial Click-Loc connector, fluid-resistant boot included.

• -CN: Approvals option designating Chinese National Standards certification for hazardous areas.

Hardware Parameter Structure

Rotor Dynamics and Signal Conditioning

The sensor utilizes precise eddy-current probe scaling to translate the physical distance from the probe tip to the target shaft surface into a linear voltage output. Field verification requires validation of the gap voltage to a benchmark of -10 VDC, centering the signal precisely in the middle of the calibrated linear conversion arc. This bias configuration permits optimal tracking of high-frequency rotor dynamics, including radial vibration and axial position changes. The embedded Click-Loc coaxial connectors maintain rigid impedance matching, which enforces cross-talk suppression between neighboring sensor channels mounted within the same bearing housing.

Kit Composition

• 1 x Bently Nevada 330103-00-04-10-11-CN Proximity Probe

• 2 x Locknuts (3/8-24 UNF thread profile)

• 1 x Coaxial connector silicone protection boot

• 1 x Installation calibration datasheet

Mechanical Alignment and Grounding Controls

• Mechanical Thread Engagement

  Inspect the mounting port to verify a clean 3/8-24 UNF thread configuration. Thread the probe into the mounting bracket by hand, ensuring a minimum of 5 full threads are engaged to secure structural positioning against high-vibration operational loads.

• Coaxial Shield Isolation

  The outer coaxial cable shield must remain completely isolated from intermediate junction boxes or machine case grounds. Connect the shield exclusively to the dedicated terminal block point inside the monitoring rack to avoid ground loop current errors.

• Cable Bend Restrictions

  Do not force the flexible coaxial extension cable into a bend radius tighter than 25.4 mm. Sharp bending parameters induce structural fractures in the inner core conductor and alter high-frequency signal transmission properties.

Field Engineering FAQ

• What is the primary purpose of verifying the gap voltage to -10 VDC during physical installation?

  This voltage sets the probe at the exact midpoint of its linear range, ensuring the sensor captures positive and negative dynamic shaft deviations without clipping the signal.

• Can this proximity probe function properly if linked to a standard analog PLC voltage input card?

  No. The passive probe demands an inline 3300 XL Proximitor Sensor to supply the high-frequency excitation signal and modulate the return path into a readable analog voltage.

• What problem occurs if the probe coaxial cabling is run parallel alongside high-voltage plant power lines?

  Electromagnetic interference will degrade the circuit, producing false vibration spikes. Cabling must use dedicated trays to preserve cross-talk suppression metrics.

• Is it acceptable to manually splice or cut the extension cable to match short physical cable runs?

  No. Altering the physical cable length modifies the tuned electrical length of the loop, destroying calibration accuracy and changing the system scale factor.

• How does contamination within the Click-Loc connector junction affect sensor loop output?

  Moisture or grease entry alters circuit resistance, triggering unstable gap voltages or a false Danger status on the monitoring rack. Always deploy the silicone boot.

• What electrical test confirms the probe assembly is fully isolated from the machine framework ground?

  Measure resistance between the outer shell of the Click-Loc connector and the machine casing using a multimeter. It must read higher than 50 megohms.

• What target criteria must the shaft fulfill for the probe to meet standard calibration parameters?

  The target material must be ferromagnetic, typically AISI 4140 steel, with a minimum diameter of 15.2 mm to match factory calibration curves.

• Can the tip of this unarmored proximity probe operate reliably while fully submerged in warm machinery oil?

  Yes, the materials composing the probe tip and cable jacket are engineered for continuous immersion in industrial lubricants without structural breakdown.