The Bently Nevada 330901-22-40-10-01-05, also cataloged as the 330901 Proximity Probe, operates as a dedicated hardware component for high-frequency displacement measurement within 3300 NSv transducer system platforms.

Model Suffix Breakdown

• 330901: 3300 NSv 5 mm proximity probe.

• 22: 1/4-28 UNF thread configuration.

• 40: 40 mm unthreaded case length.

• 10: 10 mm total case length.

• 01: Miniature coaxial connector interface.

• 05: Agency approval rating.

Hardware Specifications

Mechanical Monitoring and Eddy-Current Dynamics

The 3300 NSv probe functions via eddy-current induction to detect target displacement. Reliable rotor dynamics analysis requires precise gap voltage validation; the transducer system is calibrated to a target of -10 VDC at the center of the linear operating range. Signal integrity relies on effective cross-talk suppression, achieved by maintaining defined physical spacing between probes to prevent RF field interference. Users must ensure that probe scaling is matched to the specific target material, typically AISI 4140 steel, to maintain displacement measurement linearity.

Ordering Information

• 330901-22-40-10-01-05 Proximity Probe

• Integrated miniature coaxial connector

• Stainless steel locknuts

• Connector protection cap

• Technical compliance documentation

Field Installation Guidelines

• Mounting: Install the probe into a rigid, non-ferrous, grounded bracket to ensure mechanical stability.

• Gap Setting: Use a feeler gauge to establish the physical gap; verify the output voltage at the Proximitor terminal using a high-impedance multimeter.

• Grounding: Terminate the coaxial cable shield at the Proximitor sensor end only to prevent ground loops.

• Cabling: Use only factory-supplied shielded coaxial cables. Route through grounded conduit and avoid bending radii of less than 25 mm to prevent impedance shifts.

Technical FAQ

1. What is the standard scale factor?

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

2. What causes unstable gap voltage?

   Instability is typically caused by electrical ground loops, damaged coaxial shielding, or external electromagnetic interference.

3. How often should calibration be verified?

   Calibration verification is recommended annually or after any mechanical maintenance affecting the probe-to-target air gap.

4. What is the probe tip material?

   The 3300 NSv probe tip is constructed from polyphenylene sulfide (PPS) to withstand high-temperature industrial environments.

5. How is probe health tested?

   Health is determined by verifying coaxial continuity, checking insulation resistance, and confirming DC gap voltage linearity.

6. Can this probe be used in hazardous zones?

   The "05" suffix indicates specific agency approvals. Verify site-specific hazardous area drawings before installation.

7. What is the function of the coaxial connector?

   The miniature coaxial connector allows for signal transmission while maintaining the low-capacitance profile required by the 3300 NSv system.

8. Why is AISI 4140 steel the calibration target?

   The eddy-current response is material-dependent; AISI 4140 steel provides a predictable, industry-standard reference for displacement linearity.