The Bently Nevada 330881-28-10-060-06-02, also cataloged as the 330881 Proximity Transducer, operates as a dedicated hardware component for integrated eddy-current displacement monitoring within Turbine Supervisory Instrumentation (TSI) and rotating machinery protection systems.

Suffix Breakdown & Model Matrix

• 330881: Base identifier for the PROXPAC XL integrated proximity transducer system.

• 28: 8 mm probe diameter and standard thread configuration.

• 10: Unthreaded section length designation.

• 060: 60 mm total case length.

• 06: Specific connector and integral cable termination style.

• 02: Agency approval and hazardous area compliance rating.

Hardware Specifications

Mechanical Monitoring and Transducer Scaling

The PROXPAC XL system integrates the probe and signal conditioning electronics into a single, factory-sealed enclosure to reduce installation footprint. Proper transducer scaling is mandatory for maintaining the gap voltage validation, which centers on the -10 VDC operational setpoint. The internal electronics are designed for linearity and cross-talk suppression in high-density rack configurations. As an integrated unit, it requires precise mechanical gap setting during commissioning to ensure that the eddy-current field maintains accurate rotor dynamics tracking across the target frequency range of the monitored asset.

Ordering Info

• One (1) 330881-28-10-060-06-02 PROXPAC XL Transducer Assembly

• Required stainless steel jam nuts and mounting hardware

• Factory calibration certificate and compliance documentation

• Note: This unit utilizes an integral cable; verify that the machine port clearance allows for the full 60 mm housing length.

Field Installation Guidelines

• Mechanical Alignment:

• Mount the transducer assembly perpendicular to the shaft centerline to ensure optimal sensing field linearity.

• Use a rigid, vibration-isolated bracket to prevent independent housing resonance.

• Gap Validation:

• Employ a precision depth micrometer to establish the physical gap between the probe tip and the target.

• Connect to a high-impedance digital voltmeter and adjust the gap until the -10 VDC operating point is achieved.

• Grounding and Shielding:

• Establish a low-impedance ground connection between the transducer housing and the machine casing.

• Ensure all signal wiring is routed through protected conduit to minimize RFI/EMI induction.

• Lock Nut Security:

• Tighten the jam nuts against the mounting bracket; ensure lock washers are fully compressed to prevent vibration-induced movement.

Frequently Asked Questions

• Can the signal cable be repaired if damaged?

  No. The cable is factory-integrated and sealed within the housing to ensure environmental ingress protection. Damage to the cable necessitates replacement of the entire transducer assembly.

• Does this transducer require a remote Proximitor?

  No. The PROXPAC XL architecture embeds the signal conditioning electronics within the transducer housing, eliminating the need for external Proximitor sensors.

• How is the -10 VDC setpoint verified?

  The setpoint is verified by measuring the DC output at the monitor card input terminals while the machine is at rest or during commissioning.

• Is the housing compatible with corrosive industrial environments?

  The stainless steel housing provides robust protection, but site-specific chemical exposure should be cross-referenced with stainless steel compatibility charts.

• Why is a rigid mounting bracket necessary?

  Any mechanical resonance of the mounting bracket will be interpreted by the transducer as vibration, resulting in false readings in the TSI monitoring rack.

• Can this be installed in high-pressure oil cavities?

  Yes, provided that the mounting threads are correctly sealed with an appropriate industrial-grade sealant to prevent fluid leakage.

• Does this unit support HART or digital protocol output?

  No. This is an analog transducer providing a DC voltage proportional to gap distance, designed for interface with standard analog input monitoring cards.

• How often should the transducer be recalibrated?

  Calibration is factory-set; the device should be inspected during major outages for physical wear or probe tip damage.