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The Bently Nevada 330905-12-22-05-02-05, also cataloged as the 3300 NSv Proximity Probe, operates as a dedicated hardware component for non-contact shaft vibration and displacement measurement within machinery protection monitoring systems.

Suffix Breakdown & Model Matrix

The 330905 model code configures specific physical geometry, cable construction, and certification profiles for the 3300 NSv probe:

  • 330905: Base Model for 3300 NSv Proximity Probe (M8 x 1.25 Thread)
  • 12: Unthreaded Length option - 120 mm
  • 22: Overall Case Length option - 220 mm
  • 05: Total Length option - 0.5 meter (20 inches) cable
  • 02: Connector Option - Miniature coaxial ClickLoc connector with connector protector, standard cable
  • 05: Agency Approval Option - Multiple hazardous area approvals

Hardware Specifications

Parameter Specification
Model 330905-12-22-05-02-05
Brand Bently Nevada
Origin USA
Weight 0.15 kg
Dimensions M8 x 1.25 thread, 5 mm tip diameter
Operating Temp -40 to 120 deg C
Power Consumption Powered via 3300 XL NSv Proximitor Sensor (24 VDC system loop input)
Measurement Range Optimized for target shafts under 51 mm diameter and flat targets under 15 mm
Cable Assembly 12 m total system cable configuration, armored coaxial lead
Interface Connector Miniature coaxial ClickLoc connector with connector protector
Standard Compliance API 670 compliant

Eddy-Current Probe Scaling & Gap Voltage Validation

The 3300 NSv probe generates a high-frequency electromagnetic field at the 5 mm probe tip to measure gap changes relative to a conductive target surface. Due to the reduced side-view clearance requirement of the NSv profile, eddy-current probe scaling maintains a linear response on small-diameter shafts where standard 8 mm probes experience side-view interference. Field commissioning requires gap voltage validation to confirm the probe is set within its linear operating region. Adjusting the mechanical position until the DC gap voltage reaches -10 VDC at the Proximitor output ensures proper centered operation, while maintaining minimum probe-to-probe physical spacing prevents cross-talk suppression issues in dense radial bearing installations.

Frequently Asked Questions

Q: What target surface constraints apply to the 3300 NSv probe tip?

A: The 5 mm tip diameter and linear field geometry are optimized for shafts under 51 mm in diameter or flat target surfaces under 15 mm, preventing measurement non-linearity caused by target curvature or side clearance restrictions.

Q: How is signal integrity maintained across the coaxial connector junction?

A: The miniature coaxial ClickLoc connector requires positive mechanical latching. The integrated connector protector must be fully seated over the junction to seal against moisture and conductive fluid contamination that alters RF impedance.

Field Installation Guidelines

  1. Mechanical Mounting: Thread the M8 x 1.25 body into the mounting bore using a calibrated torque wrench. Do not exceed maximum thread installation torque limits.
  2. Gap Voltage Setting: Set the static gap by measuring DC voltage across the Proximitor output terminals until reaching the target gap voltage of -10 VDC.
  3. Cable Routing: Route the armored coaxial lead away from high-voltage motor feeds and variable frequency drive wiring. Maintain a minimum bend radius of 25.4 mm (1.0 inch).
  4. Shield Grounding: Ensure the coaxial shield path remains isolated from machine ground along the cable run and terminates at the single-point instrument ground at the Proximitor housing.

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