Configured for high-frequency radial vibration and axial position monitoring in industrial rotating machinery, the Bently Nevada 330901-00-15-05-02-05 (330901 Proximity Probe) provides direct physical displacement execution through eddy-current sensing technology.

Model Configuration Breakdown

• 330901: 3300 NSv 5 mm proximity probe.

• 00-15: Unthreaded case length and thread configuration.

• 05: Total case length.

• 02: Miniature coaxial connector interface.

• 05: Agency approval classification.

Hardware Specifications

Mechanical Monitoring and Signal Validation

This probe utilizes eddy-current induction to measure displacement relative to a conductive target. To maintain measurement accuracy for rotor dynamics, the system requires gap voltage validation; the nominal center gap is set to -10 VDC. Operators must implement cross-talk suppression by ensuring adequate physical spacing between multiple probes installed on the same rotor diameter. Probe scaling must be matched to the conductive target material, typically AISI 4140 steel, to prevent non-linearity and calibration drift within the monitoring loop.

Ordering Information

• 330901-00-15-05-02-05 Proximity Probe

• Integrated miniature coaxial connector

• Stainless steel locknuts

• Connector protection cap

• Technical documentation and factory calibration report

Field Installation Guidelines

• Mounting: Secure the probe using a rigid, non-conductive tapped mounting bracket to prevent ground loops and electromagnetic interference.

• Gap Setting: Utilize a precision feeler gauge to establish the physical gap; verify the resulting voltage at the Proximitor sensor terminal block.

• Cabling: Route the coaxial cable through grounded metal conduit. Avoid sharp bends (minimum radius 25 mm) to prevent changes in characteristic impedance.

• Shielding: Ensure the coaxial shield is continuous and terminated correctly at the Proximitor end to prevent signal degradation from external high-frequency noise.

Technical FAQ

1. What is the probe scale factor?

   The 3300 NSv system is calibrated for a scale factor of 7.87 V/mm (200 mV/mil).

2. What causes fluctuations in gap voltage?

   Fluctuations are typically caused by mechanical shaft runout, electrical ground loops, or damaged coaxial cable shielding.

3. What is the recommended probe-to-target gap?

   The target gap is set to achieve a nominal center reading of -10 VDC at the Proximitor sensor output.

4. How is probe health verified?

   Health is confirmed by measuring the loop continuity, insulation resistance of the coaxial cable, and verifying the DC gap voltage linearity across the measurement range.

5. Can this probe be used with 8 mm system components?

   No, 3300 NSv probes are impedance-matched to 3300 NSv Proximitors and extension cables; mixing with 3300 XL (8 mm) components will cause severe measurement errors.

6. What is the effect of target material on sensitivity?

   Sensitivity is highly dependent on target conductivity and permeability; non-standard materials require specific scaling factor adjustment and field recalibration.

7. What is the minimum bend radius for the cable?

   To preserve signal integrity and impedance, the miniature coaxial cable must not be bent with a radius less than 25 mm.

8. How does frequency response affect monitoring?

   The NSv system is optimized for high-frequency displacement measurement; ensure the Proximitor bandwidth is sufficient for the target machine's vibration frequencies.