The Bently Nevada 330905-00-09-05-02-CN, also cataloged as the 330905 3300 NSv Proximity Probe, is a specialized transducer designed for high-precision eddy-current displacement measurement in constrained mechanical environments, such as small-diameter shafts or limited-clearance turbomachinery, specifically featuring China-compliant (CN) approvals.

Suffix Breakdown & Model Matrix

The 330905-00-09-05-02-CN follows the specialized 3300 NSv (Near-field Sensing) transducer nomenclature:

• 330905: 3300 NSv proximity probe (Standard mount).

• 00: Unthreaded length (0 mm).

• 09: Overall case length (9 mm).

• 05: Total length (0.5 meters).

• 02: Connector type (Connector with housing).

• CN: Agency approval (China-specific compliance).

Hardware Specifications

Eddy-Current Sensing and Rotor Dynamics

The 3300 NSv system is engineered to solve measurement challenges on small-diameter shafts where traditional 8 mm probes lack linear range or mounting space. By utilizing a smaller probe tip and optimized magnetic field characteristics, it provides superior linearity in near-field conditions. As with all NSv systems, gap voltage validation is a mandatory commissioning step; the target operational setpoint is -10 VDC to maintain the transducer in its linear sensing region. The system includes internal cross-talk suppression to ensure signal fidelity in high-density sensor arrays within TSI (Turbine Supervisory Instrumentation) racks.

Ordering info

• One (1) 330905-00-09-05-02-CN NSv Proximity Probe.

• Mounting hardware (jam nuts and lock washers).

• Technical compliance documentation (CN approved).

• Note: This transducer must be used with a matched NSv Proximitor sensor to maintain system-wide calibration accuracy.

Field Installation Guidelines

• Mechanical Interface: Mount the probe perpendicularly to the target shaft; ensure a rigid bracket to prevent mechanical resonance which can introduce noise into the TSI monitor.

• Gap Setting: Utilize a depth micrometer to establish the mechanical gap; verify the output voltage at the Proximitor test pin (Target: -10 VDC).

• Cabling: Route the miniature coaxial cable with care; avoid sharp bends and maintain separation from high-energy power lines to reduce EMI.

• Connector Integrity: Ensure the miniature coaxial connectors are fully seated and clean; use protective caps if the assembly is exposed to industrial contaminants.

• Vibration Locking: Secure jam nuts to prevent thread movement during operation, ensuring the gap remains constant throughout the machine cycle.

Frequently Asked Questions

• Why is the NSv system preferred for small shafts?

  The 3300 NSv system features a smaller probe tip and an optimized magnetic field, minimizing edge effects that cause measurement errors on small-diameter shafts.

• Is this probe compatible with standard 3300 XL Proximitors?

  No. The NSv probe has unique electrical characteristics and must be used exclusively with the NSv Proximitor.

• What is the target gap voltage for this model?

  The target gap voltage is -10 VDC, which centers the probe within its calibrated linear displacement range.

• Can I use this probe in hazardous areas?

  The "CN" suffix denotes China-specific compliance; verify that your site requirements match the specific hazardous area ratings associated with this model.

• Is the probe tip field-replaceable?

  No. The probe tip is permanently bonded. Damage to the tip or body requires replacing the entire probe assembly.

• How is a failure in the NSv system typically identified?

  Failure is indicated by an erratic or fixed output voltage on the TSI monitor, often caused by probe tip impact, mechanical housing damage, or cable discontinuity.

• Does this probe require a specific target material?

  The system is calibrated for 4140 steel. Alternative target materials require a scale factor adjustment to maintain measurement accuracy.

• How is the case length (9 mm) measured?

  This 9 mm length is the total length of the probe case, essential for verifying fitment in limited clearance areas.