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The Bently Nevada 330851-02-000-060-10-00-CN, also cataloged as the 330851 Proximity Probe, operates as a dedicated hardware component for non-contact shaft vibration and axial position measurement within 3500 Machinery Protection System networks. It utilizes an eddy-current tip design to translate mechanical clearance variations relative to a conductive target into proportional high-frequency voltage fluctuations sent to matching Proximitor sensors.

Suffix Breakdown & Model Matrix

The ordering options for the 330851-02-000-060-10-00-CN probe define the following hardware specifications:

  • 330851: Base Model Designation for 3300 XL 25 mm Proximity Probe.
  • 02: Probe Case Type Option – M30x2 thread.
  • 000: Unthreaded Length Option – 0 inches (fully threaded case).
  • 060: Overall Case Length Option – 60 mm.
  • 10: Total Length Option – 1.0 meter (3.3 feet).
  • 00: Armor Option – No armor.
  • CN: Agency Approval Option – Country-specific approvals.

Hardware Specifications

Parameter Specification
Model 330851-02-000-060-10-00-CN
Brand Bently Nevada
Origin United States
Weight 0.23 kg (Shipping Weight: 1.5 kg)
Dimensions M30x2 thread, 60 mm case length, 1.0 m total cable length
Operating Temp -51 deg C to +177 deg C
Power Consumption Passive physical media (0 W)
Probe Tip Diameter 25 mm (0.98 in)
System Target 3300 XL 25 mm Proximitor Sensor System
Cable Type Coaxial, miniature ClickLock connector

Eddy-Current Probe Scaling and Rotor Dynamics Tracking

The 330851 proximity probe relies on precise eddy-current probe scaling to convert magnetic field interactions with a rotating target into calibrated linear voltage outputs. When paired with its designated 3300 XL Proximitor sensor, the 25 mm tip diameter provides extended linear range capability suitable for large-diameter shaft applications and high-displacement thrust measurements.

During field commissioning, gap voltage validation requires setting the probe static gap to establish a baseline output, typically targeting -10 VDC at mid-span clearance. Accurate gap alignment prevents signal saturation during extreme rotor dynamics transients and maintains optimal cross-talk suppression between adjacent orthogonal probe pairs mounted in close proximity within bearing housings.

Frequently Asked Questions

Q: Can the 1.0 m integral cable on the 330851 probe be trimmed or spliced in the field?

A: No. Splicing or cutting the probe cable alters the system electrical inductance and capacitance. This disrupts eddy-current probe scaling, causes severe calibration drift, and invalidates gap voltage validation targets.

Q: What is the purpose of the ClickLock coaxial connector on the probe cable?

A: The ClickLock connector ensures a positive, vibration-resistant mechanical latch between the probe lead and the extension cable, preventing microphonic signal noise and accidental disconnects under heavy machinery vibration.

Field Installation Guidelines

  1. Inspect the 25 mm probe tip, M30x2 threads, and miniature coaxial connector for dirt, oil, or mechanical damage before mounting.
  2. Thread the probe into the mounting bracket or casing, maintaining clean thread engagement without applying excessive torque to the casing hex flats.
  3. Route the coaxial cable to the junction box, maintaining a minimum static bend radius of 25.4 mm (1.0 in) to prevent internal shield damage.
  4. Separate the probe cable from high-voltage AC motor wires and variable frequency drive (VFD) output cables by at least 300 mm to avoid electromagnetic noise coupling.
  5. Connect the probe cable to the extension cable, press the ClickLock connector until seated, and secure the connection using an approved connector protector boot.
  6. Verify gap voltage validation across the Proximitor output terminals using a digital multimeter; confirm the reading matches the target voltage (typically -10 VDC) at static machine equilibrium.
  7. Connect the signal cable shield to instrument earth at the monitoring rack end only. Leave the shield floating at the probe junction box to eliminate ground loops.

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