Configured for continuous mechanical vibration and shaft position tracking in harsh industrial environments, the Bently Nevada 330800-28-20-057-03-02, also cataloged as the 330800 PROXPAC XL Proximity Transducer, operates as a dedicated hardware component for integrated eddy-current displacement sensing within rotating machinery protection systems.

Suffix Breakdown & Model Matrix

• Base Model Number: 330800 (PROXPAC XL Proximity Transducer Assembly)
• Full Catalog String: 330800-28-20-057-03-02
• Probe and Approvals Option (-28): 3300 XL 8 mm probe with multiple hazardous area approvals
• Mechanical Design Parameters: Integrated housing configuration combining probe tip, sleeve dimensions, and internal Proximitor sensor electronics

Hardware Specifications

Transducer Measurement Mechanics and Monitoring Behavior

• Eddy-Current Probe Scaling: High-frequency RF signals drive the internal 8 mm probe tip coil, producing a linear voltage variation directly tracking the changing air gap between the probe face and the conductive rotating shaft target.
• Gap Voltage Validation: Field technicians must verify that the initial static operating point achieves exactly -10 VDC using a digital multimeter during mechanical alignment to guarantee full linear dynamic range.
• Cross-Talk Suppression: Proper spatial separation and high-frequency modulation design minimize signal interference when multiple proximity assemblies are installed in close proximity on shared machinery casing.
• Rotor Dynamics Monitoring: Translates radial vibration orbits and axial position shifts into real-time analog inputs for machinery protection systems without physical surface contact.

Ordering Info

• 1 x 330800-28-20-057-03-02 PROXPAC XL Proximity Transducer Assembly Base
• 1 x Integrated 3300 XL 8 mm Probe Tip and Internal Proximitor Sensor Module
• 1 x Associated Terminal Housing Cover, Grounding Liner, and Mounting Hardware Kit

Mechanical Installation Guidelines

• Housing Torque Limits: Tighten the retaining nut to 29.5 N m (260 in lb) and the probe sleeve locknut to 39.3 N m (350 in lb) to secure structural integrity under vibration.
• Gap Distance Setting: Rotate the internal assembly until the target air gap yields a stable -10 VDC output signal on the monitoring system prior to final locking.
• Conduit and Cable Routing: Terminate field wiring through certified NPT fittings, keeping signal lines physically separated from high-voltage motor feeds to prevent noise coupling.
• Grounding Compliance: Ensure the internal stainless steel grounding liner and housing are bonded correctly to machinery earth reference to maintain noise immunity.

Frequently Asked Questions

• What is the total nominal weight of the PROXPAC XL assembly?

  The typical system weight is approximately 1.44 kg (3.2 lbm) depending on sleeve configuration.

• What probe type is integrated into this specific model code?

  It integrates a 3300 XL 8 mm proximity probe with multiple hazardous area approvals.

• What is the target static gap voltage during setup?

  Installers must adjust the mechanical position until the multimeter registers a -10 VDC output.

• What DC supply voltage drives the internal Proximitor sensor?

  The unit operates on a negative supply voltage ranging from -17.5 VDC to -26 VDC.

• What material is utilized for the outer protective housing?

  The housing is constructed from ultraviolet-resistant, glass-reinforced polyphenylene sulfide (PPS) thermoplastic.

• Can this transducer handle severe mechanical impacts?

  Yes, the housing is certified to withstand up to 7 Joule impacts at ambient room temperature.

• What scale factor does the transducer output provide?

  It provides a standard incremental scale factor of 3.94 V/mm (100 mV/mil).

• What primary machinery parameters does the unit track?

  It monitors shaft radial vibration, rotor dynamic behavior, and axial thrust position.